Contactless measurements of photocarrier transport properties in perovskite single crystals

Xiwen Gong, Ziru Huang, Randy Sabatini, Chih-Shan Tan, Golam Bappi, Grant Walters, Andrew Proppe, Makhsud I. Saidaminov, Oleksandr Voznyy, Shana O. Kelley and Edward H. Sargent ()
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Xiwen Gong: University of Toronto
Ziru Huang: University of Toronto
Randy Sabatini: University of Toronto
Chih-Shan Tan: University of Toronto
Golam Bappi: University of Toronto
Grant Walters: University of Toronto
Andrew Proppe: University of Toronto
Makhsud I. Saidaminov: University of Toronto
Oleksandr Voznyy: University of Toronto
Shana O. Kelley: University of Toronto
Edward H. Sargent: University of Toronto

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract The remarkable properties of metal halide perovskites arising from their impressive charge carrier diffusion lengths have led to rapid advances in solution-processed optoelectronics. Unfortunately, diffusion lengths reported in perovskite single crystals have ranged widely – from 3 μm to 3 mm – for ostensibly similar materials. Here we report a contactless method to measure the carrier mobility and further extract the diffusion length: our approach avoids both the effects of contact resistance and those of high electric field. We vary the density of quenchers – epitaxially included within perovskite single crystals – and report the dependence of excited state lifetime in the perovskite on inter-quencher spacing. Our results are repeatable and self-consistent (i.e. they agree on diffusion length for many different quencher concentrations) to within ± 6%. Using this method, we obtain a diffusion length in metal-halide perovskites of 2.6 μm ± 0.1 μm.

Date: 2019
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DOI: 10.1038/s41467-019-09538-7

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