Grain-Size-Limited Mobility in Methylammonium Lead Iodide Perovskite Thin Films

Obadiah Reid; Mengjin Yang; Nikos Kopidakis; Kai Zhu; Garry Rumbles

doi:10.1021/acsenergylett.6b00288

Grain-Size-Limited Mobility in Methylammonium Lead Iodide Perovskite Thin Films

Obadiah Reid, Mengjin Yang, Nikos Kopidakis, Kai Zhu, Garry Rumbles

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

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Abstract

We report a systematic study of the gigahertz-frequency charge carrier mobility found in methylammonium lead iodide perovskite films as a function of average grain size using time-resolved microwave conductivity and a single processing chemistry. Our measurements are in good agreement with the Kubo formula for the AC mobility of charges confined within finite grains, suggesting (1) that the surface grains imaged via scanning electron microscopy are representative of the true electronic domain size and not substantially subdivided by twinning or other defects not visible by microscopy and (2) that the time scale of diffusive transport across grain boundaries is much slower than the period of the microwave field in this measurement (∼100 ps). The intrinsic (infinite grain size) minimum mobility extracted form the model is 29 ± 6 cm² V^-1 s^-1 at the probe frequency (8.9 GHz).

Original language	American English
Pages (from-to)	561-565
Number of pages	5
Journal	ACS Energy Letters
Volume	1
Issue number	3
DOIs	https://doi.org/10.1021/acsenergylett.6b00288 https://doi.org/10.1021/acsenergylett.6b00288
State	Published - 9 Sep 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

NREL Publication Number

NREL/JA-5900-67047

Keywords

grain size
methylammonium lead iodide perovskite films
solar-photochemistry

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abstract = "We report a systematic study of the gigahertz-frequency charge carrier mobility found in methylammonium lead iodide perovskite films as a function of average grain size using time-resolved microwave conductivity and a single processing chemistry. Our measurements are in good agreement with the Kubo formula for the AC mobility of charges confined within finite grains, suggesting (1) that the surface grains imaged via scanning electron microscopy are representative of the true electronic domain size and not substantially subdivided by twinning or other defects not visible by microscopy and (2) that the time scale of diffusive transport across grain boundaries is much slower than the period of the microwave field in this measurement (∼100 ps). The intrinsic (infinite grain size) minimum mobility extracted form the model is 29 ± 6 cm2 V-1 s-1 at the probe frequency (8.9 GHz).",

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AU - Reid, Obadiah

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AU - Zhu, Kai

AU - Rumbles, Garry

PY - 2016/9/9

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AB - We report a systematic study of the gigahertz-frequency charge carrier mobility found in methylammonium lead iodide perovskite films as a function of average grain size using time-resolved microwave conductivity and a single processing chemistry. Our measurements are in good agreement with the Kubo formula for the AC mobility of charges confined within finite grains, suggesting (1) that the surface grains imaged via scanning electron microscopy are representative of the true electronic domain size and not substantially subdivided by twinning or other defects not visible by microscopy and (2) that the time scale of diffusive transport across grain boundaries is much slower than the period of the microwave field in this measurement (∼100 ps). The intrinsic (infinite grain size) minimum mobility extracted form the model is 29 ± 6 cm2 V-1 s-1 at the probe frequency (8.9 GHz).

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KW - solar-photochemistry

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Grain-Size-Limited Mobility in Methylammonium Lead Iodide Perovskite Thin Films

Abstract

Bibliographical note

NREL Publication Number

Keywords

UN SDGs

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