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Journal of Materials Science

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09-05-2017 | Energy materials

Surface photovoltage inversion and photocatalytic properties of PbI₂ microcrystals under sub-bandgap illumination

Authors: Wenli Ma, Feng Yang, Yushu Wang, Junrong Chen, Ling Yuan, Dong Xie, Yong Zhao, Yong Zhang, Jinfang Peng

Published in: Journal of Materials Science | Issue 16/2017

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Abstract

Surface photovoltage inversion was found in PbI₂ microcrystals, manifested as a significant increase in the absolute value of surface barrier height under sub-bandgap illumination. The corresponding surface states located at 0.43 eV above the valence band was detected, and the magnitude of photovoltage inversion was found to increase with increasing applied field strength. Besides, transient surface photovoltage responses and the time constants of the relaxation showed a dependence on the wavelength of illumination. When irradiated with 518–632 nm, the exciton together with the lead ion vacancy caused the population of holes in the surface state; while under 700-nm light irradiation, holes depopulation occurred on the surface. Transient surface photovoltage results show that the relaxation of the sub-bandgap surface photovoltage is exponential with long time constant. The different charge transportation processes agree well with the photocatalytic degradation of MO experiments under different wavelength irradiation. It is revealed that the exciton and the surface states could significantly affect the movement of photogenerated charge carriers, which lead to different degradation results of MO. These findings demonstrate a model involving photostimulated population of surface states for the study of surfaces of wide energy gap semiconductors, which shows the highly selective control of photogenerated charge carriers’ behaviors by tuning the wavelength of irradiation.

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Title: Surface photovoltage inversion and photocatalytic properties of PbI2 microcrystals under sub-bandgap illumination
Authors: Wenli Ma
Feng Yang
Yushu Wang
Junrong Chen
Ling Yuan
Dong Xie
Yong Zhao
Yong Zhang
Jinfang Peng
Publication date: 09-05-2017
Publisher: Springer US
Published in: Journal of Materials Science / Issue 16/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-017-1123-5

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