Monte Carlo study of PbSe quantum dots as the fluorescent material in luminescent solar concentrators

S. R. Wilton; M. R. Fetterman; J. J. Low; Guanjun You; Zhenyu Jiang; Jian Xu

doi:10.1364/OE.22.000A35

Optics Express
Vol. 22,
Issue S1,
pp. A35-A43
(2014)
•https://doi.org/10.1364/OE.22.000A35

Monte Carlo study of PbSe quantum dots as the fluorescent material in luminescent solar concentrators

S. R. Wilton, M. R. Fetterman, J. J. Low, Guanjun You, Zhenyu Jiang, and Jian Xu

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S. R. Wilton, M. R. Fetterman, J. J. Low, Guanjun You, Zhenyu Jiang, and Jian Xu, "Monte Carlo study of PbSe quantum dots as the fluorescent material in luminescent solar concentrators," Opt. Express 22, A35-A43 (2014)

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Abstract

In this paper, Monte Carlo simulations were performed to determine the potential efficiencies of luminescent solar concentrator (LSC) systems using PbSe quantum dots (QDs) as the active fluorescent material. The simulation results suggest that PbSe QD LSCs display good absorption characteristics, but yield limited LSC power conversion efficiency due to self-absorption and down-conversion loss. It is proposed that the self-absorption loss can be reduced by utilizing Förster resonance energy transfer between two different sizes of PbSe QDs, yielding pronounced improvement in the optical efficiency of LSCs.

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Fig. 1 Absorption spectra (percent absorption vs. wavelength) at PbSe QD solution concentrations of 0.35 μM, 1.1 μM, 5.3 μM and 39.6 μM and emission spectrum (normalized PL intensity vs. wavelength) of PbSe QDs in a 5 mm thick container.

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Fig. 2 Absorption efficiency (η_abs) vs. PbSe QD concentration (c) for simulated 2.5, 5.0, and 10mm thick LSCs with c ranging from 0.1 to 50 μM.

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Fig. 3 Self-absorption efficiency (η_SA) vs. PbSe QD concentration (c) for simulated 300 × 300 × 2.5 mm³ LSCs with c ranging from 0.1 to 50 μM and η_QY = 0.40 and 0.80.

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Fig. 4 Absorption and photoluminescence spectra of FRET enhanced PbSe QDs with a D/A ratio of 5:1. FRET coupling between the donor and acceptor QDs results in a single emission peak.

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Tables (1)

Table 1 LSC Monte Carlo simulation results for PbSe QD LSCs with A_LSC 300 × 300mm² and optimized QD concentrations for highest efficiency.

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Equations (10)

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η_{a b s} = \frac{# o f A b s o r b e d P h o t o n s}{# o f I n c i d e n t P h o t o n s} .

η_{t r a p} = \frac{\sqrt{n^{2} - 1}}{n} .

η_{o p t} = \frac{# o f C o l l e c t e d P h o t o n s}{# o f I n c i d e n t P h o t o n s} .

I_{S C} = q Φ_{p} A_{L S C} η_{E Q E} .

V_{O C} \approx \frac{K T}{q} l n (\frac{I_{S C}}{I {}_{0}} + 1) .

η_{E Q E} = \frac{# o f E x t r a c t e d E l e c t r o n s}{# o f I n c i d e n t P h o t o n s} .

η_{P C E} = \frac{I_{S C} V_{O C} F F}{P_{i n}} .

F_{P C E} = G \frac{η_{P C E}}{η_{P V}} .

G = \frac{A_{L S C}}{A_{P V}} .

η_{o p t} = η_{a b s} η_{Q Y} η_{t r a p} η_{S A} .

t (mm)	G	BSR	*c_x* (μM)	*η_QY*	*η_opt* (%)	*η_PCE* (%)	*F_PCE*
2.5	30	No	2.4	0.40	2.63	0.18	1.01
		Yes	1.6	0.40	3.66	0.27	1.49
		No	3.5	0.80	8.32	0.63	3.49
		Yes	2.2	0.80	11.1	0.90	5.03
5.0	15	No	1.5	0.40	3.76	0.26	0.73
		Yes	1.0	0.40	5.09	0.37	1.03
		No	2.3	0.80	11.3	0.83	2.33
		Yes	1.2	0.80	14.6	1.16	3.28
10	7.5	No	0.7	0.40	5.07	0.34	0.48
		Yes	0.5	0.40	7.11	0.50	0.72
		No	1.4	0.80	14.6	1.08	1.51
		Yes	0.8	0.80	18.5	1.48	2.07

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Tables (1)

Equations (10)

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