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Title: Intrinsic carrier diffusion in perovskite thin films uncovered by transient reflectance spectroscopy
Authors: Feng, Minjun
Ye, Senyun
Guo, Yuanyuan
Sum, Tze Chien
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Feng, M., Ye, S., Guo, Y. & Sum, T. C. (2022). Intrinsic carrier diffusion in perovskite thin films uncovered by transient reflectance spectroscopy. Nano Letters, 22(17), 7195-7202.
Project: MOE2019-T2-1-006 
Journal: Nano Letters
Abstract: Carrier diffusion and surface recombination are key processes influencing the performance of conventional semiconductor devices. However, the interplay of photon recycling together with these processes in halide perovskites obfuscates our understanding. Herein, we discern these inherent processes in a thin FAPbBr3 perovskite single crystal (PSC) utilizing a unique transient reflectance technique that allows accurate diffusion modeling with clear boundary conditions. Temperature-dependent measurements reveal the coexistence of shallow and deep traps at the surface. The inverse quadratic dependence of temperature on carrier mobility μ suggests an underlying scattering mechanism arising from the anharmonic deformation of the PbBr6 cage. Our findings ascertain the fundamental limits of the intrinsic surface recombination velocity (S) and carrier diffusion coefficient (D) in PSC samples. Importantly, these insights will help resolve the ongoing debate and clarify the ambiguity surrounding the contributions of photon recycling and carrier diffusion in perovskite optoelectronics.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.2c02511
DOI (Related Dataset): 10.21979/N9/8JDYHO
Schools: School of Physical and Mathematical Sciences 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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