Abstract

Ultrafast time-resolved absorption spectroscopy is used to investigate exciton dynamics in CdSe nanocrystal films. The effects of morphology, quantum-dot versus quantum-rod, and preparation of nanocrystals in a thin film form are investigated. The measurements revealed longer intraband exciton relaxation in quantum-rods than in quantum-dots. The slowed relaxation in quantum-rods is due to mitigation of the Auger-relaxation mechanism from elongating the nanocrystal. In addition, the nanocrystal thin film showed long-lived confined acoustic phonons corresponding to the ellipsoidal breathing mode, contrary to others work on colloidal systems of CdSe nanocrystals.

© 2012 OSA

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  1. V. I. Klimov, “Optical nonlinearities and ultrafast carrier dynamics in semiconductor nanocrystals,” J. Phys. Chem. B 104(26), 6112–6123 (2000).
    [CrossRef]
  2. V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
    [CrossRef] [PubMed]
  3. P. Kambhampati, “Hot exciton relaxation dynamics in semiconductor quantum dots: radiationless transitions on the nanoscale,” J. Phys. Chem. C 115(45), 22089–22109 (2011).
    [CrossRef]
  4. P. Kambhampati, “Unraveling the structure and dynamics of excitons in semiconductor quantum dots,” Acc. Chem. Res. 44(1), 1–13 (2011).
    [CrossRef] [PubMed]
  5. M. B. Mohamed, C. Burda, M. A. El-Sayed, “Shape dependent ultrafast relaxation dynamics of CdSe Nanocrystals: Nanorods vs Nanodots,” Nano Lett. 1(11), 589–593 (2001).
    [CrossRef]
  6. A. Nozik, “Quantum dot solar cells,” Physica E. 14(1-2), 115–120 (2002).
    [CrossRef]
  7. K. Tvrdy, P. V. Kamat, “Substrate driven photochemistry of CdSe quantum dot films: charge injection and irreversible transformations on oxide surfaces,” J. Phys. Chem. A 113(16), 3765–3772 (2009).
    [CrossRef] [PubMed]
  8. K. Tvrdy, P. A. Frantsuzov, P. V. Kamat, “Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles,” Proc. Natl. Acad. Sci. U.S.A. 108(1), 29–34 (2011).
    [CrossRef] [PubMed]
  9. M. C. Beard, R. J. Ellingson, “Multiple exciton generation in semiconductor nanocrystals: Toward efficient solar energy conversion,” Laser Photon. Rev. 2(5), 377–399 (2008).
    [CrossRef]
  10. I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
    [CrossRef] [PubMed]
  11. A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
    [CrossRef] [PubMed]
  12. C. Murray, D. Norris, M. Bawendi, “Synthesis and characterization of nearly monodisperse CdE (E= sulfur, selenium, tellurium) semiconductor nanocrystallites,” J. Am. Chem. Soc. 115(19), 8706–8715 (1993).
    [CrossRef]
  13. F. Shieh, A. E. Saunders, B. A. Korgel, “General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures,” J. Phys. Chem. B 109(18), 8538–8542 (2005).
    [CrossRef] [PubMed]
  14. W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
    [CrossRef]
  15. J. Nanda, B. Kuruvilla, D. Sarma, “Photoelectron spectroscopic study of CdS nanocrystallites,” Phys. Rev. B 59(11), 7473–7479 (1999).
    [CrossRef]
  16. J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
    [CrossRef]
  17. D. J. Norris, M. G. Bawendi, “Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots,” Phys. Rev. B Condens. Matter 53(24), 16338–16346 (1996).
    [CrossRef] [PubMed]
  18. R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
    [CrossRef] [PubMed]
  19. L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
    [CrossRef] [PubMed]
  20. D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
    [CrossRef]
  21. L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
    [CrossRef] [PubMed]
  22. L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
    [CrossRef]
  23. H. Lamb, “On the vibrations of an elastic sphere,” Proc. Lond. Math. Soc. S1-13(1), 189–212 (1881).
    [CrossRef]
  24. A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
    [CrossRef]

2012 (1)

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

2011 (4)

P. Kambhampati, “Hot exciton relaxation dynamics in semiconductor quantum dots: radiationless transitions on the nanoscale,” J. Phys. Chem. C 115(45), 22089–22109 (2011).
[CrossRef]

P. Kambhampati, “Unraveling the structure and dynamics of excitons in semiconductor quantum dots,” Acc. Chem. Res. 44(1), 1–13 (2011).
[CrossRef] [PubMed]

K. Tvrdy, P. A. Frantsuzov, P. V. Kamat, “Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles,” Proc. Natl. Acad. Sci. U.S.A. 108(1), 29–34 (2011).
[CrossRef] [PubMed]

L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
[CrossRef] [PubMed]

2009 (1)

K. Tvrdy, P. V. Kamat, “Substrate driven photochemistry of CdSe quantum dot films: charge injection and irreversible transformations on oxide surfaces,” J. Phys. Chem. A 113(16), 3765–3772 (2009).
[CrossRef] [PubMed]

2008 (3)

M. C. Beard, R. J. Ellingson, “Multiple exciton generation in semiconductor nanocrystals: Toward efficient solar energy conversion,” Laser Photon. Rev. 2(5), 377–399 (2008).
[CrossRef]

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

2007 (1)

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

2006 (1)

I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
[CrossRef] [PubMed]

2005 (2)

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

F. Shieh, A. E. Saunders, B. A. Korgel, “General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures,” J. Phys. Chem. B 109(18), 8538–8542 (2005).
[CrossRef] [PubMed]

2003 (1)

L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
[CrossRef] [PubMed]

2002 (1)

A. Nozik, “Quantum dot solar cells,” Physica E. 14(1-2), 115–120 (2002).
[CrossRef]

2001 (1)

M. B. Mohamed, C. Burda, M. A. El-Sayed, “Shape dependent ultrafast relaxation dynamics of CdSe Nanocrystals: Nanorods vs Nanodots,” Nano Lett. 1(11), 589–593 (2001).
[CrossRef]

2000 (3)

V. I. Klimov, “Optical nonlinearities and ultrafast carrier dynamics in semiconductor nanocrystals,” J. Phys. Chem. B 104(26), 6112–6123 (2000).
[CrossRef]

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

1999 (1)

J. Nanda, B. Kuruvilla, D. Sarma, “Photoelectron spectroscopic study of CdS nanocrystallites,” Phys. Rev. B 59(11), 7473–7479 (1999).
[CrossRef]

1996 (2)

D. J. Norris, M. G. Bawendi, “Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots,” Phys. Rev. B Condens. Matter 53(24), 16338–16346 (1996).
[CrossRef] [PubMed]

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

1993 (1)

C. Murray, D. Norris, M. Bawendi, “Synthesis and characterization of nearly monodisperse CdE (E= sulfur, selenium, tellurium) semiconductor nanocrystallites,” J. Am. Chem. Soc. 115(19), 8706–8715 (1993).
[CrossRef]

1881 (1)

H. Lamb, “On the vibrations of an elastic sphere,” Proc. Lond. Math. Soc. S1-13(1), 189–212 (1881).
[CrossRef]

Anni, M.

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

Banerjee, S.

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

Banin, U.

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

Barsan, M.

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Bawendi, M.

C. Murray, D. Norris, M. Bawendi, “Synthesis and characterization of nearly monodisperse CdE (E= sulfur, selenium, tellurium) semiconductor nanocrystallites,” J. Am. Chem. Soc. 115(19), 8706–8715 (1993).
[CrossRef]

Bawendi, M. G.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

D. J. Norris, M. G. Bawendi, “Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots,” Phys. Rev. B Condens. Matter 53(24), 16338–16346 (1996).
[CrossRef] [PubMed]

Beard, M. C.

M. C. Beard, R. J. Ellingson, “Multiple exciton generation in semiconductor nanocrystals: Toward efficient solar energy conversion,” Laser Photon. Rev. 2(5), 377–399 (2008).
[CrossRef]

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Braun, M.

L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
[CrossRef] [PubMed]

Buhbut, S.

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

Burda, C.

M. B. Mohamed, C. Burda, M. A. El-Sayed, “Shape dependent ultrafast relaxation dynamics of CdSe Nanocrystals: Nanorods vs Nanodots,” Nano Lett. 1(11), 589–593 (2001).
[CrossRef]

Butler, I.

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Califano, M.

L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
[CrossRef] [PubMed]

Champagnon, B.

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

Chandrasekharan, N.

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

Cooney, R.

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Cretì, A.

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

Dias, E.

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Duval, E.

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

Dworak, L.

L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
[CrossRef] [PubMed]

Efros, A. L.

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Eisler, H.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Ekimov, I.

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

Ellingson, R. J.

M. C. Beard, R. J. Ellingson, “Multiple exciton generation in semiconductor nanocrystals: Toward efficient solar energy conversion,” Laser Photon. Rev. 2(5), 377–399 (2008).
[CrossRef]

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

El-Sayed, M. A.

M. B. Mohamed, C. Burda, M. A. El-Sayed, “Shape dependent ultrafast relaxation dynamics of CdSe Nanocrystals: Nanorods vs Nanodots,” Nano Lett. 1(11), 589–593 (2001).
[CrossRef]

Franceschetti, A.

L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
[CrossRef] [PubMed]

Frantsuzov, P. A.

K. Tvrdy, P. A. Frantsuzov, P. V. Kamat, “Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles,” Proc. Natl. Acad. Sci. U.S.A. 108(1), 29–34 (2011).
[CrossRef] [PubMed]

Herman, I. P.

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

Hodes, G.

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

Hollingsworth, J. A.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Jia, S.

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

Johnson, J. C.

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Kamat, P. V.

K. Tvrdy, P. A. Frantsuzov, P. V. Kamat, “Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles,” Proc. Natl. Acad. Sci. U.S.A. 108(1), 29–34 (2011).
[CrossRef] [PubMed]

K. Tvrdy, P. V. Kamat, “Substrate driven photochemistry of CdSe quantum dot films: charge injection and irreversible transformations on oxide surfaces,” J. Phys. Chem. A 113(16), 3765–3772 (2009).
[CrossRef] [PubMed]

I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
[CrossRef] [PubMed]

Kambhampati, P.

P. Kambhampati, “Hot exciton relaxation dynamics in semiconductor quantum dots: radiationless transitions on the nanoscale,” J. Phys. Chem. C 115(45), 22089–22109 (2011).
[CrossRef]

P. Kambhampati, “Unraveling the structure and dynamics of excitons in semiconductor quantum dots,” Acc. Chem. Res. 44(1), 1–13 (2011).
[CrossRef] [PubMed]

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Klimov, V. I.

V. I. Klimov, “Optical nonlinearities and ultrafast carrier dynamics in semiconductor nanocrystals,” J. Phys. Chem. B 104(26), 6112–6123 (2000).
[CrossRef]

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Korgel, B. A.

F. Shieh, A. E. Saunders, B. A. Korgel, “General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures,” J. Phys. Chem. B 109(18), 8538–8542 (2005).
[CrossRef] [PubMed]

Kudriavtsev, I.

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

Kuno, M.

I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
[CrossRef] [PubMed]

Kuruvilla, B.

J. Nanda, B. Kuruvilla, D. Sarma, “Photoelectron spectroscopic study of CdS nanocrystallites,” Phys. Rev. B 59(11), 7473–7479 (1999).
[CrossRef]

Lamb, H.

H. Lamb, “On the vibrations of an elastic sphere,” Proc. Lond. Math. Soc. S1-13(1), 189–212 (1881).
[CrossRef]

Lanzani, G.

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

Leatherdale, C. A.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Lomascolo, M.

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

Malko, A.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Manna, L.

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

Matylitsky, V. V.

L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
[CrossRef] [PubMed]

Micic, O. I.

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Mikhailovsky, A. A.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Mohamed, M. B.

M. B. Mohamed, C. Burda, M. A. El-Sayed, “Shape dependent ultrafast relaxation dynamics of CdSe Nanocrystals: Nanorods vs Nanodots,” Nano Lett. 1(11), 589–593 (2001).
[CrossRef]

Murray, C.

C. Murray, D. Norris, M. Bawendi, “Synthesis and characterization of nearly monodisperse CdE (E= sulfur, selenium, tellurium) semiconductor nanocrystallites,” J. Am. Chem. Soc. 115(19), 8706–8715 (1993).
[CrossRef]

Nanda, J.

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

J. Nanda, B. Kuruvilla, D. Sarma, “Photoelectron spectroscopic study of CdS nanocrystallites,” Phys. Rev. B 59(11), 7473–7479 (1999).
[CrossRef]

Norris, D.

C. Murray, D. Norris, M. Bawendi, “Synthesis and characterization of nearly monodisperse CdE (E= sulfur, selenium, tellurium) semiconductor nanocrystallites,” J. Am. Chem. Soc. 115(19), 8706–8715 (1993).
[CrossRef]

Norris, D. J.

D. J. Norris, M. G. Bawendi, “Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots,” Phys. Rev. B Condens. Matter 53(24), 16338–16346 (1996).
[CrossRef] [PubMed]

Nozik, A.

A. Nozik, “Quantum dot solar cells,” Physica E. 14(1-2), 115–120 (2002).
[CrossRef]

Nozik, A. J.

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Robel, I.

I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
[CrossRef] [PubMed]

Sagar, D.

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Salant, A.

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

Sapra, S.

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

Sarma, D.

J. Nanda, B. Kuruvilla, D. Sarma, “Photoelectron spectroscopic study of CdS nanocrystallites,” Phys. Rev. B 59(11), 7473–7479 (1999).
[CrossRef]

Sarma, D. D.

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

Saunders, A. E.

F. Shieh, A. E. Saunders, B. A. Korgel, “General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures,” J. Phys. Chem. B 109(18), 8538–8542 (2005).
[CrossRef] [PubMed]

Saviot, L.

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

Sewall, S.

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

Shabaev, A.

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Shalom, M.

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

Shieh, F.

F. Shieh, A. E. Saunders, B. A. Korgel, “General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures,” J. Phys. Chem. B 109(18), 8538–8542 (2005).
[CrossRef] [PubMed]

Steigerwald, M. L.

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

Subramanian, V.

I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
[CrossRef] [PubMed]

Tachan, Z.

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

Tvrdy, K.

K. Tvrdy, P. A. Frantsuzov, P. V. Kamat, “Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles,” Proc. Natl. Acad. Sci. U.S.A. 108(1), 29–34 (2011).
[CrossRef] [PubMed]

K. Tvrdy, P. V. Kamat, “Substrate driven photochemistry of CdSe quantum dot films: charge injection and irreversible transformations on oxide surfaces,” J. Phys. Chem. A 113(16), 3765–3772 (2009).
[CrossRef] [PubMed]

Wachtveitl, J.

L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
[CrossRef] [PubMed]

Wang, L.-W.

L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
[CrossRef] [PubMed]

Wang, W.

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

Xu, S.

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

Yu, P.

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Zaban, A.

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

Zavelani-Rossi, M.

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

Zunger, A.

L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
[CrossRef] [PubMed]

Acc. Chem. Res. (1)

P. Kambhampati, “Unraveling the structure and dynamics of excitons in semiconductor quantum dots,” Acc. Chem. Res. 44(1), 1–13 (2011).
[CrossRef] [PubMed]

Chem. Mater. (2)

W. Wang, S. Banerjee, S. Jia, M. L. Steigerwald, I. P. Herman, “Ligand control of growth, morphology, and capping structure of colloidal CdSe nanorods,” Chem. Mater. 19(10), 2573–2580 (2007).
[CrossRef]

J. Nanda, S. Sapra, D. D. Sarma, N. Chandrasekharan, G. Hodes, “Size-Selected Zinc Sulfide Nanocrystallites: Synthesis, Structure, and Optical Studies,” Chem. Mater. 12(4), 1018–1024 (2000).
[CrossRef]

J. Am. Chem. Soc. (2)

I. Robel, V. Subramanian, M. Kuno, P. V. Kamat, “Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films,” J. Am. Chem. Soc. 128(7), 2385–2393 (2006).
[CrossRef] [PubMed]

C. Murray, D. Norris, M. Bawendi, “Synthesis and characterization of nearly monodisperse CdE (E= sulfur, selenium, tellurium) semiconductor nanocrystallites,” J. Am. Chem. Soc. 115(19), 8706–8715 (1993).
[CrossRef]

J. Non-Cryst. Solids (1)

L. Saviot, B. Champagnon, E. Duval, I. Kudriavtsev, I. Ekimov, “Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses,” J. Non-Cryst. Solids 197(2-3), 238–246 (1996).
[CrossRef]

J. Opt. A: Pure Appl. Opt. (1)

A. Cretì, M. Anni, M. Zavelani-Rossi, G. Lanzani, L. Manna, M. Lomascolo, “Ultrafast carrier dynamics and confined acoustic phonons in CdSe nanorods,” J. Opt. A: Pure Appl. Opt. 10(6), 064004 (2008).
[CrossRef]

J. Phys. Chem. A (1)

K. Tvrdy, P. V. Kamat, “Substrate driven photochemistry of CdSe quantum dot films: charge injection and irreversible transformations on oxide surfaces,” J. Phys. Chem. A 113(16), 3765–3772 (2009).
[CrossRef] [PubMed]

J. Phys. Chem. B (2)

V. I. Klimov, “Optical nonlinearities and ultrafast carrier dynamics in semiconductor nanocrystals,” J. Phys. Chem. B 104(26), 6112–6123 (2000).
[CrossRef]

F. Shieh, A. E. Saunders, B. A. Korgel, “General shape control of colloidal CdS, CdSe, CdTe quantum rods and quantum rod heterostructures,” J. Phys. Chem. B 109(18), 8538–8542 (2005).
[CrossRef] [PubMed]

J. Phys. Chem. C (1)

P. Kambhampati, “Hot exciton relaxation dynamics in semiconductor quantum dots: radiationless transitions on the nanoscale,” J. Phys. Chem. C 115(45), 22089–22109 (2011).
[CrossRef]

Laser Photon. Rev. (1)

M. C. Beard, R. J. Ellingson, “Multiple exciton generation in semiconductor nanocrystals: Toward efficient solar energy conversion,” Laser Photon. Rev. 2(5), 377–399 (2008).
[CrossRef]

Nano Lett. (3)

M. B. Mohamed, C. Burda, M. A. El-Sayed, “Shape dependent ultrafast relaxation dynamics of CdSe Nanocrystals: Nanorods vs Nanodots,” Nano Lett. 1(11), 589–593 (2001).
[CrossRef]

A. Salant, M. Shalom, Z. Tachan, S. Buhbut, A. Zaban, U. Banin, “Quantum rod-sensitized solar cell: nanocrystal shape effect on the photovoltaic properties,” Nano Lett. 12(4), 2095–2100 (2012).
[CrossRef] [PubMed]

R. J. Ellingson, M. C. Beard, J. C. Johnson, P. Yu, O. I. Micic, A. J. Nozik, A. Shabaev, A. L. Efros, “Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots,” Nano Lett. 5(5), 865–871 (2005).
[CrossRef] [PubMed]

Phys. Rev. B (2)

D. Sagar, R. Cooney, S. Sewall, E. Dias, M. Barsan, I. Butler, P. Kambhampati, “Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots,” Phys. Rev. B 77(23), 235321 (2008).
[CrossRef]

J. Nanda, B. Kuruvilla, D. Sarma, “Photoelectron spectroscopic study of CdS nanocrystallites,” Phys. Rev. B 59(11), 7473–7479 (1999).
[CrossRef]

Phys. Rev. B Condens. Matter (1)

D. J. Norris, M. G. Bawendi, “Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots,” Phys. Rev. B Condens. Matter 53(24), 16338–16346 (1996).
[CrossRef] [PubMed]

Phys. Rev. Lett. (2)

L. Dworak, V. V. Matylitsky, M. Braun, J. Wachtveitl, “Coherent Longitudinal-Optical Ground-State Phonon in CdSe Quantum Dots Triggered by Ultrafast Charge Migration,” Phys. Rev. Lett. 107(24), 247401 (2011).
[CrossRef] [PubMed]

L.-W. Wang, M. Califano, A. Zunger, A. Franceschetti, “Pseudopotential Theory of Auger Processes in CdSe Quantum Dots,” Phys. Rev. Lett. 91(5), 056404 (2003).
[CrossRef] [PubMed]

Physica E. (1)

A. Nozik, “Quantum dot solar cells,” Physica E. 14(1-2), 115–120 (2002).
[CrossRef]

Proc. Lond. Math. Soc. (1)

H. Lamb, “On the vibrations of an elastic sphere,” Proc. Lond. Math. Soc. S1-13(1), 189–212 (1881).
[CrossRef]

Proc. Natl. Acad. Sci. U.S.A. (1)

K. Tvrdy, P. A. Frantsuzov, P. V. Kamat, “Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles,” Proc. Natl. Acad. Sci. U.S.A. 108(1), 29–34 (2011).
[CrossRef] [PubMed]

Science (1)

V. I. Klimov, A. A. Mikhailovsky, S. Xu, A. Malko, J. A. Hollingsworth, C. A. Leatherdale, H. Eisler, M. G. Bawendi, “Optical gain and stimulated emission in nanocrystal quantum dots,” Science 290(5490), 314–317 (2000).
[CrossRef] [PubMed]

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Figures (4)

Fig. 1
Fig. 1

TEM images, XRD, and UV - Vis absorption spectra with scaled second derivative data of CdSe QD(a,b,c) and QR(d,e,f) films.

Fig. 2
Fig. 2

Transient absorption results (a) for the QD film using a 400 nm pump pulse and various probe wavelengths shown in (b) where the color of the arrows corresponds to the respective TA trace.

Fig. 3
Fig. 3

Transient absorption results (a) for the QR film using a 400 nm pump pulse and various probe wavelengths shown in (b) where the color of the arrows corresponds to the respective TA trace.

Fig. 4
Fig. 4

Fourier transform of B1 probes for the QD (a) and QR (b) samples.

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

L= Kλ βcos(θ)
ρ 2 u t 2 =(λ+u)div(u)+μ 2 u
u(r)= p lm L lm (hr)+ q lm N lm (kr)
ω lm = S lm v i /(2a)

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