Elucidating the role of disorder and free-carrier recombination kinetics in CH3NH3PbI3 perovskite films

Chan La-o-vorakiat, Teddy Salim, Jeannette Kadro, Mai-Thu Khuc, Reinhard Haselsberger, Liang Cheng, Huanxin Xia, Gagik G. Gurzadyan, Haibin Su, Yeng Ming Lam, Rudolph A. Marcus (), Maria-Elisabeth Michel-Beyerle () and Elbert E. M. Chia ()
Additional contact information
Chan La-o-vorakiat: School of Physical and Mathematical Sciences, Nanyang Technological University
Teddy Salim: School of Materials Science and Engineering, Nanyang Technological University
Jeannette Kadro: School of Physical and Mathematical Sciences, Nanyang Technological University
Mai-Thu Khuc: School of Physical and Mathematical Sciences, Nanyang Technological University
Reinhard Haselsberger: School of Physical and Mathematical Sciences, Nanyang Technological University
Liang Cheng: School of Physical and Mathematical Sciences, Nanyang Technological University
Huanxin Xia: School of Physical and Mathematical Sciences, Nanyang Technological University
Gagik G. Gurzadyan: School of Physical and Mathematical Sciences, Nanyang Technological University
Haibin Su: School of Materials Science and Engineering, Nanyang Technological University
Yeng Ming Lam: School of Materials Science and Engineering, Nanyang Technological University
Rudolph A. Marcus: School of Physical and Mathematical Sciences, Nanyang Technological University
Maria-Elisabeth Michel-Beyerle: School of Physical and Mathematical Sciences, Nanyang Technological University
Elbert E. M. Chia: School of Physical and Mathematical Sciences, Nanyang Technological University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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 a perovskite film by the use of time-resolved terahertz spectroscopy. 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.

Date: 2015
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DOI: 10.1038/ncomms8903

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