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.
%0 Journal Article
%1 gong2019contactless
%A Gong, Xiwen
%A Huang, Ziru
%A Sabatini, Randy
%A Tan, Chih-Shan
%A Bappi, Golam
%A Walters, Grant
%A Proppe, Andrew
%A Saidaminov, Makhsud I.
%A Voznyy, Oleksandr
%A Kelley, Shana O.
%A Sargent, Edward H.
%D 2019
%J Nature Communications
%K contactless measurements photocarrier properties transport
%N 1
%P 1591--
%R 10.1038/s41467-019-09538-7
%T Contactless measurements of photocarrier transport properties in perovskite single crystals
%U https://doi.org/10.1038/s41467-019-09538-7
%V 10
%X 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.
@article{gong2019contactless,
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.},
added-at = {2019-04-10T13:54:42.000+0200},
author = {Gong, Xiwen and Huang, Ziru and Sabatini, Randy and Tan, Chih-Shan and Bappi, Golam and Walters, Grant and Proppe, Andrew and Saidaminov, Makhsud I. and Voznyy, Oleksandr and Kelley, Shana O. and Sargent, Edward H.},
biburl = {https://www.bibsonomy.org/bibtex/2fd3a2000bbc4559610109954e7399655/sere},
doi = {10.1038/s41467-019-09538-7},
interhash = {a5aafa7f0197e744363cfda95d6f71ac},
intrahash = {fd3a2000bbc4559610109954e7399655},
issn = {20411723},
journal = {Nature Communications},
keywords = {contactless measurements photocarrier properties transport},
number = 1,
pages = {1591--},
refid = {Gong2019},
timestamp = {2019-04-10T13:54:42.000+0200},
title = {Contactless measurements of photocarrier transport properties in perovskite single crystals},
url = {https://doi.org/10.1038/s41467-019-09538-7},
volume = 10,
year = 2019
}