Long-range charge carrier mobility in metal halide perovskite thin-films and single crystals via transient photo-conductivity

Author:

Lim JongchulORCID,Kober-Czerny ManuelORCID,Lin Yen-HungORCID,Ball James M.,Sakai Nobuya,Duijnstee Elisabeth A.,Hong Min Ji,Labram John G.ORCID,Wenger BernardORCID,Snaith Henry J.ORCID

Abstract

AbstractCharge carrier mobility is a fundamental property of semiconductor materials that governs many electronic device characteristics. For metal halide perovskites, a wide range of charge carrier mobilities have been reported using different techniques. Mobilities are often estimated via transient methods assuming an initial charge carrier population after pulsed photoexcitation and measurement of photoconductivity via non-contact or contact techniques. For nanosecond to millisecond transient methods, early-time recombination and exciton-to-free-carrier ratio hinder accurate determination of free-carrier population after photoexcitation. By considering both effects, we estimate long-range charge carrier mobilities over a wide range of photoexcitation densities via transient photoconductivity measurements. We determine long-range mobilities for FA0.83Cs0.17Pb(I0.9Br0.1)3, (FA0.83MA0.17)0.95Cs0.05Pb(I0.9Br0.1)3 and CH3NH3PbI3-xClx polycrystalline films in the range of 0.3 to 6.7 cm2 V−1 s−1. We demonstrate how our data-processing technique can also reveal more precise mobility estimates from non-contact time-resolved microwave conductivity measurements. Importantly, our results indicate that the processing of polycrystalline films significantly affects their long-range mobility.

Funder

Ministry of Trade, Industry and Energy

European Commission via a Marie-Skłodowska-Curie individual fellowship

RCUK | Engineering and Physical Sciences Research Council

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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