Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Dielectric properties of a CsPbBr3 quantum dot solution in the terahertz region

Not Accessible

Your library or personal account may give you access

Abstract

In recent years, CsPbBr3 quantum dots (QDs) have attracted much attention due to their bright prospects in solar cell studies. Dielectric properties are important for the fabrication of optoelectronic devices. Here, the dielectric properties of a CsPbBr3 QD solution are investigated between 0.1 and 2.0 THz by terahertz time-domain spectroscopy. The measured frequency-dependent transmitted ratio is found to decrease from 0.96 to 0.80 in this range. By comparing different concentrations of the QD solution, the frequency-averaged absorption is linearly increased with the increase in QD concentration. After that, the frequency-dependent dielectric constant, including the complex refractive index, complex dielectric constant, and conductivity, is extracted by Fourier transform of the time-domain spectrum. An effective medium approach method is adopted to extract the complex dielectric constant of a CsPbBr3 QD inclusion, and a slight peak around 0.4 THz is found in the imaginary part of the dielectric constant. The result of Drude–Lorentz fitting shows that the phonon plays a dominant role in the dielectric properties of a CsPbBr3 QD solution. Moreover, the THz response of a CsPbBr3 QD is found to be unchanged when the test is conducted under illumination. We attribute this phenomenon to the discrete energy level of excitons in CsPbBr3 QDs due to quantum confinement, and design a comparative experiment to validate it. This study is significant for its deeper insight into the dielectric properties of CsPbBr3 QDs, and thus is helpful through its applications in optoelectronics.

© 2017 Optical Society of America

Full Article  |  PDF Article
More Like This
Dielectric property of MoS2 crystal in terahertz and visible regions

Xianding Yan, Lipeng Zhu, Yixuan Zhou, Yiwen E, Li Wang, and Xinlong Xu
Appl. Opt. 54(22) 6732-6736 (2015)

CsPbBr3 perovskite quantum dots: saturable absorption properties and passively Q-switched visible lasers

Jingzhou Li, Hongxing Dong, Bin Xu, Saifeng Zhang, Zhiping Cai, Jun Wang, and Long Zhang
Photon. Res. 5(5) 457-460 (2017)

Giant photoluminescence enhancement in monolayer WS2 by energy transfer from CsPbBr3 quantum dots

Yu Liu, Han Li, Xin Zheng, Xiangai Cheng, and Tian Jiang
Opt. Mater. Express 7(4) 1327-1334 (2017)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (11)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved