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Title: Individual Electron and Hole Mobilities in Lead-Halide Perovskites Revealed by Noncontact Methods

Abstract

Charge carrier mobilities help determine semiconductor performance in optoelectronic applications, but measurement of the individual electron and hole mobilities usually involves indirect methods or probes with electrical contacts that are influenced by the quality of the interface or contact. Here, a noncontact method is introduced to distinguish the mobilities of electrons and holes by combining time-resolved terahertz spectroscopy (TRTS) and optical transient reflection (TR) spectroscopy. The validation of this method is first demonstrated on a semi-insulator GaAs wafer, and then, three lead-halide perovskite polycrystalline films with different cation mixtures are studied. We find that the hole mobility is significantly higher (~10x) than that of the electron mobility in all of the perovskite thin films studied. The highly alloyed triple cation polycrystalline film shows the highest mobility, longest bulk carrier lifetime, and lowest surface recombination velocity.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); Xiamen Univ., Xiamen (China)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1580494
Report Number(s):
NREL/JA-5900-74898
Journal ID: ISSN 2380-8195
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; carrier mobility; THz; perovskite thin films

Citation Formats

Zhai, Yaxin, Wang, Kang, Zhang, Fei, Xiao, Chuanxiao, Rose, Aaron H., Zhu, Kai, and Beard, Matthew C. Individual Electron and Hole Mobilities in Lead-Halide Perovskites Revealed by Noncontact Methods. United States: N. p., 2019. Web. doi:10.1021/acsenergylett.9b02310.
Zhai, Yaxin, Wang, Kang, Zhang, Fei, Xiao, Chuanxiao, Rose, Aaron H., Zhu, Kai, & Beard, Matthew C. Individual Electron and Hole Mobilities in Lead-Halide Perovskites Revealed by Noncontact Methods. United States. doi:10.1021/acsenergylett.9b02310.
Zhai, Yaxin, Wang, Kang, Zhang, Fei, Xiao, Chuanxiao, Rose, Aaron H., Zhu, Kai, and Beard, Matthew C. Thu . "Individual Electron and Hole Mobilities in Lead-Halide Perovskites Revealed by Noncontact Methods". United States. doi:10.1021/acsenergylett.9b02310.
@article{osti_1580494,
title = {Individual Electron and Hole Mobilities in Lead-Halide Perovskites Revealed by Noncontact Methods},
author = {Zhai, Yaxin and Wang, Kang and Zhang, Fei and Xiao, Chuanxiao and Rose, Aaron H. and Zhu, Kai and Beard, Matthew C.},
abstractNote = {Charge carrier mobilities help determine semiconductor performance in optoelectronic applications, but measurement of the individual electron and hole mobilities usually involves indirect methods or probes with electrical contacts that are influenced by the quality of the interface or contact. Here, a noncontact method is introduced to distinguish the mobilities of electrons and holes by combining time-resolved terahertz spectroscopy (TRTS) and optical transient reflection (TR) spectroscopy. The validation of this method is first demonstrated on a semi-insulator GaAs wafer, and then, three lead-halide perovskite polycrystalline films with different cation mixtures are studied. We find that the hole mobility is significantly higher (~10x) than that of the electron mobility in all of the perovskite thin films studied. The highly alloyed triple cation polycrystalline film shows the highest mobility, longest bulk carrier lifetime, and lowest surface recombination velocity.},
doi = {10.1021/acsenergylett.9b02310},
journal = {ACS Energy Letters},
number = 1,
volume = 5,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
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This content will become publicly available on November 21, 2020
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