Extended carrier lifetimes and diffusion in hybrid perovskites revealed by Hall effect and photoconductivity measurements

Y. Chen, H. T. Yi, X. Wu, R. Haroldson, Y. N. Gartstein, Y. I. Rodionov, K. S. Tikhonov, A. Zakhidov, X. -Y. Zhu and V. Podzorov ()
Additional contact information
Y. Chen: Rutgers University
H. T. Yi: Rutgers University
X. Wu: Columbia University
R. Haroldson: University of Texas at Dallas
Y. N. Gartstein: University of Texas at Dallas
Y. I. Rodionov: The Institute for Theoretical and Applied Electrodynamics, The National University of Science and Technology, MISIS
K. S. Tikhonov: Landau Institute for Theoretical Physics
A. Zakhidov: University of Texas at Dallas
X. -Y. Zhu: Columbia University
V. Podzorov: Rutgers University

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Impressive performance of hybrid perovskite solar cells reported in recent years still awaits a comprehensive understanding of its microscopic origins. In this work, the intrinsic Hall mobility and photocarrier recombination coefficient are directly measured in these materials in steady-state transport studies. The results show that electron-hole recombination and carrier trapping rates in hybrid perovskites are very low. The bimolecular recombination coefficient (10−11 to 10−10 cm3 s−1) is found to be on par with that in the best direct-band inorganic semiconductors, even though the intrinsic Hall mobility in hybrid perovskites is considerably lower (up to 60 cm2 V−1 s−1). Measured here, steady-state carrier lifetimes (of up to 3 ms) and diffusion lengths (as long as 650 μm) are significantly longer than those in high-purity crystalline inorganic semiconductors. We suggest that these experimental findings are consistent with the polaronic nature of charge carriers, resulting from an interaction of charges with methylammonium dipoles.

Date: 2016
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DOI: 10.1038/ncomms12253

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