Published in

Nature Research, Nature Communications, 1(6), 2015

DOI: 10.1038/ncomms8903

Links

Tools

Export citation

Search in Google Scholar

Elucidating the role of disorder and free-carrier recombination kinetics in CH_3NH_3PbI_3 perovskite films

Journal article published in 2015 by Chan La-O.-Vorakiat, Chan La O. Vorakiat, Teddy Salim ORCID, Jeannette Kadro, Mai-Thu Khuc, Reinhard Haselsberger, Liang Cheng, Huanxin Xia, Gagik G. Gurzadyan ORCID, Haibin Su, Yeng Ming Lam, Rudolph A. Marcus, Maria-Elisabeth Michel-Beyerle, Elbert E. M. Chia ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Red circle
Postprint: archiving forbidden
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

AbstractApart 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.