Perovskite Carrier Transport: Disentangling the Impacts of Effective Mass and Scattering Time Through Microscopic Optical Detection

The Journal of Physical Chemistry Letters
Andrew H HillErik M Grumstrup

Abstract

While carrier mobility is a practical and commonly cited measure of transport, it conflates the effects of two more fundamental material properties: the effective mass and mean scattering time of charge carriers. This Letter describes the correlation of two ultrafast imaging techniques to disentangle the effect of each on carrier transport in lead halide perovskites. Two materials are compared: methylammonium lead tri-iodide (MAPbI3) and cesium lead bromide diiodide (CsPbBrI2). By correlating photoinduced changes to the refractive index with a direct measure of carrier diffusion, both the carrier optical mass and mean scattering time are uniquely determined on microscopic length scales. These results show that the factor of 4 lower mobility of CsPbBrI2 is due not to differing optical masses of charge carriers, which are measured to be similar in CsPbBrI2 and MAPbI3, but rather to a difference in mean carrier scattering time. The scope and limitations of the approach are discussed.

References

Nov 1, 1993·Physical Review. B, Condensed Matter·D Emin
Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Dec 1, 2015·The Journal of Physical Chemistry Letters·Melike KarakusEnrique Canovas
Feb 11, 2016·The Journal of Physical Chemistry Letters·Rachel E BealMichael D McGehee
Jan 11, 2017·The Journal of Physical Chemistry Letters·Jun Kang, Lin-Wang Wang
Feb 10, 2017·The Journal of Physical Chemistry Letters·Andrew H HillErik M Grumstrup
Feb 22, 2017·The Journal of Physical Chemistry Letters·Azat F AkbulatovPavel A Troshin
Aug 19, 2017·Science Advances·Kiyoshi MiyataX-Y Zhu
Nov 5, 2017·Nature Communications·Jianhui FuTze Chien Sum
Mar 24, 2018·Advanced Materials·David A EggerOmer Yaffe

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Citations

Nov 23, 2019·Annual Review of Physical Chemistry·Naomi S Ginsberg, William A Tisdale
May 2, 2021·Nature Communications·Rui SuRui Zhu
Jul 10, 2021·The Journal of Chemical Physics·Zhenyu OuyangAndrew M Moran
Jun 30, 2019·The Journal of Physical Chemistry. a·Geoffrey Piland, Erik M Grumstrup
Nov 16, 2019·The Journal of Physical Chemistry. a·Olivia F WilliamsAndrew M Moran
Aug 28, 2020·Journal of the American Chemical Society·Ti WangLibai Huang

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