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Role of disorder and recombination kinetics in the performance of CH3NH3PbI3 perovskite films (Conference Presentation)
Author(s): Elbert Chia; Chan Lao-o-vorakiat; Teddy Salim; Jeannette Kadro; M.-T. Khuc; R. Haselsberger; Liang Cheng; Huanxin Xia; Gagik G. Gurzadyan; H. B. Su; Yeng Ming Lam; R. A. Marcus; Maria-Elisabeth Michel-Beyerle
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Paper Abstract

Apart from broadband absorption of solar radiation, the performance of photovoltaic devices is governed by the density and mobility of photogenerated charge carriers. The latter parameters indicate how many free carriers move away from their origin, and how fast, before loss mechanisms such as carrier recombination occur. However, only lower bounds of these parameters are usually obtained. Here we independently determine both density and mobility of charge carriers in the organometallic halide perovskite film CH3NH3PbI3 by use of time-resolved terahertz (THz) spectroscopy (TRTS). Our data reveal the modification of the free carrier response by strong backscattering expected from these heavily disordered perovskite films. The results for different phases and different temperatures show a change of kinetics from two-body recombination at room temperature to three-body recombination at low temperatures. Our results suggest that perovskite-based solar cells can perform well even at low temperatures as long as the three-body recombination has not become predominant.

Paper Details

Date Published: 9 June 2017
PDF: 1 pages
Proc. SPIE 10210, Next-Generation Spectroscopic Technologies X, 1021011 (9 June 2017); doi: 10.1117/12.2263606
Show Author Affiliations
Elbert Chia, Nanyang Technological Univ. (Singapore)
Chan Lao-o-vorakiat, Nanyang Technological Univ. (Singapore)
Teddy Salim, Nanyang Technological Univ. (Singapore)
Jeannette Kadro, Nanyang Technological Univ. (Singapore)
M.-T. Khuc, Nanyang Technological Univ. (Singapore)
R. Haselsberger, Nanyang Technological Univ. (Singapore)
Liang Cheng, Nanyang Technological Univ. (Singapore)
Huanxin Xia, Nanyang Technological Univ. (Singapore)
Gagik G. Gurzadyan, Nanyang Technological Univ. (Singapore)
H. B. Su, Nanyang Technological Univ. (Singapore)
Yeng Ming Lam, Nanyang Technological Univ. (Singapore)
R. A. Marcus, California Institute of Technology (United States)
Maria-Elisabeth Michel-Beyerle, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 10210:
Next-Generation Spectroscopic Technologies X
Mark A. Druy; Richard A. Crocombe; Steven M. Barnett; Luisa T. Profeta, Editor(s)

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