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DOI	10.1073/pnas.2023642118
	Theory of bulk photovoltaic effect in Anderson insulator
	Ishizuka H.; Nagaosa N.
发表日期	2021
ISSN	00278424
卷号	118 期号:10
英文摘要	The localization of wavefunction by disorder makes a conductive material an insulator with vanishing conductivity at zero temperature. A similar outcome is expected for the photocurrent in semiconductor p-n junctions because the photoexcited carriers cannot drift through the device. In contrast, we here show numerically that the bulk photovoltaic effect—the photovoltaic effect in noncentrosymmetric bulk materials—occurs in a noncentrosymmetric, disordered, one-dimensional insulator where all eigenstates are localized. We find this photocurrent remains, even when the energy scale of random potential is larger than the bandwidth. On the other hand, the photocurrent decays exponentially when the excitation is local, i.e., when only a part of the device is illuminated. The photocurrent also vanishes if the relaxation occurs only by contact with the electrodes. Our result implies that the ratio of the photovoltaic current and the direct current by the variable-range hopping increases with decreasing temperature. These results suggest a route to design high-efficiency solar cells and photodetectors. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Anderson localization; Optoelectronics; Photovoltaic effect; Shift current
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180408
作者单位	Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Applied Physics, University of Tokyo, Tokyo, 113-8656, Japan; RIKEN Center for Emergent Matter Science (CEMS), Saitama, 351-0198, Japan
推荐引用方式 GB/T 7714	Ishizuka H.,Nagaosa N.. Theory of bulk photovoltaic effect in Anderson insulator[J],2021,118(10).
APA	Ishizuka H.,&Nagaosa N..(2021).Theory of bulk photovoltaic effect in Anderson insulator.Proceedings of the National Academy of Sciences of the United States of America,118(10).
MLA	Ishizuka H.,et al."Theory of bulk photovoltaic effect in Anderson insulator".Proceedings of the National Academy of Sciences of the United States of America 118.10(2021).