Contactless measurements of photocarrier transport properties in perovskite single crystals
Date
2019
Authors
Gong, Xiwen
Huang, Ziru
Sabatini, Randy
Tan, Chih-Shan
Bappi, Golam
Walters, Grant
Proppe, Andrew
Saidaminov, Makhsud I.
Voznyy, Oleksandr
Kelley, Shana O.
Journal Title
Journal ISSN
Volume Title
Publisher
Nature Communications
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.
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Citation
Gong, X., Huang, Z., Sabatini, R., Tan, C., Bappi, G., Walters, G., Proppe, A., Saidaminov, M. I., Voznyy, O., Kelley, S. O., & Sargent, E. H. (2019). Contactless measurements of photocarrier transport properties in perovskite single crystals. Nature Communications, 10(1). https://doi.org/10.1038/s41467-019-09538-7