From Event: SPIE Commercial + Scientific Sensing and Imaging, 2017
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.
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, and Maria-Elisabeth Michel-Beyerle, "Role of disorder and recombination kinetics in the performance of CH3NH3PbI3 perovskite films (Conference Presentation)," Proc. SPIE 10210, Next-Generation Spectroscopic Technologies X, 1021011 (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 11, 2017; Published: 9 June 2017); https://doi.org/10.1117/12.2263606.5460418239001.
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