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Issue 17, 2016
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Spectral dependence of direct and trap-mediated recombination processes in lead halide perovskites using time resolved microwave conductivity

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Abstract

Elucidating the decay mechanisms of photoexcited charge carriers is key to improving the efficiency of solar cells based on organo-lead halide perovskites. Here we investigate the spectral dependence (via above-, inter- and sub-bandgap optical excitations) of direct and trap-mediated decay processes in CH3NH3PbI3 using time resolved microwave conductivity (TRMC). We find that the total end-of-pulse mobility is excitation wavelength dependent – the mobility is maximized (172 cm2 V−1 s−1) when charge carriers are excited by near bandgap light (780 nm) in the low charge carrier density regime (109 photons per cm2), and is lower for above- and sub-bandgap excitations. Direct recombination is found to occur on the 100–400 ns timescale across excitation wavelengths near and above the bandgap, whereas indirect recombination processes displayed distinct behaviour following above- and sub-bandgap excitations, suggesting the influence of different trap distributions on recombination dynamics.

Graphical abstract: Spectral dependence of direct and trap-mediated recombination processes in lead halide perovskites using time resolved microwave conductivity

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Supplementary files

Article information


Submitted
30 Nov 2015
Accepted
21 Mar 2016
First published
25 Mar 2016

Phys. Chem. Chem. Phys., 2016,18, 12043-12049
Article type
Paper

Spectral dependence of direct and trap-mediated recombination processes in lead halide perovskites using time resolved microwave conductivity

J. A. Guse, A. M. Soufiani, L. Jiang, J. Kim, Y. Cheng, T. W. Schmidt, A. Ho-Baillie and D. R. McCamey, Phys. Chem. Chem. Phys., 2016, 18, 12043
DOI: 10.1039/C5CP07360J

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