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; Edward H. Sargent

doi:10.1038/s41467-019-09538-7

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, Edward H. Sargent^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

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.

Original language	English (US)
Article number	1591
Journal	Nature communications
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-09538-7
State	Published - Dec 1 2019

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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title = "Contactless measurements of photocarrier transport properties in perovskite single crystals",

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.",

author = "Xiwen Gong and Ziru Huang and Randy Sabatini and Tan, {Chih Shan} and Golam Bappi and Grant Walters and Andrew Proppe and Saidaminov, {Makhsud I.} and Oleksandr Voznyy and Kelley, {Shana O.} and Sargent, {Edward H.}",

note = "Funding Information: This publication is based in part on work supported by the US Department of the Navy, Office of Naval Research (Grant Award No.: N00014-17-1-2524), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The authors thank L. Levina for the assistance in CQDs synthesis, A. Lough, Y. Gao for single crystal XRD, P. Brodersen for TOF-SIMS and E. Palmiano, R. Wolowiec, and D. Kopilovic for their help during the course of study. X.G. thanks Mitacs for a Globalink Graduate Fellowship Award. M.I.S. acknowledges the support of the Banting Postdoctoral Fellowship Program, administered by the Government of Canada. Publisher Copyright: {\textcopyright} 2019, The Author(s).",

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AU - Gong, Xiwen

AU - Huang, Ziru

AU - Sabatini, Randy

AU - Tan, Chih Shan

AU - Bappi, Golam

AU - Walters, Grant

AU - Proppe, Andrew

AU - Saidaminov, Makhsud I.

AU - Voznyy, Oleksandr

AU - Kelley, Shana O.

AU - Sargent, Edward H.

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PY - 2019/12/1

Y1 - 2019/12/1

N2 - 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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Contactless measurements of photocarrier transport properties in perovskite single crystals

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