Surface photogalvanic effect in Ag2Te

Xiaoyi Xie, Pengliang Leng, Zhenyu Ding, Jinshan Yang, Jingyi Yan, Junchen Zhou, Zihan Li, Linfeng Ai, Xiangyu Cao, Zehao Jia, Yuda Zhang, Minhao Zhao, Wenguang Zhu, Yang Gao (), Shaoming Dong and Faxian Xiu ()
Additional contact information
Xiaoyi Xie: Fudan University
Pengliang Leng: Fudan University
Zhenyu Ding: University of Science and Technology of China
Jinshan Yang: Chinese Academy of Science
Jingyi Yan: Chinese Academy of Science
Junchen Zhou: Fudan University
Zihan Li: Fudan University
Linfeng Ai: Fudan University
Xiangyu Cao: Fudan University
Zehao Jia: Fudan University
Yuda Zhang: Fudan University
Minhao Zhao: Fudan University
Wenguang Zhu: University of Science and Technology of China
Yang Gao: University of Science and Technology of China
Shaoming Dong: Chinese Academy of Science
Faxian Xiu: Fudan University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The bulk photovoltaic effect (BPVE) in non-centrosymmetric materials has attracted significant attention in recent years due to its potential to surpass the Shockley-Queisser limit. Although these materials are strictly constrained by symmetry, progress has been made in artificially reducing symmetry to stimulate BPVE in wider systems. However, the complexity of these techniques has hindered their practical implementation. In this study, we demonstrate a large intrinsic photocurrent response in centrosymmetric topological insulator Ag2Te, attributed to the surface photogalvanic effect (SPGE), which is induced by symmetry reduction of the surface. Through diverse spatially-resolved measurements on specially designed devices, we directly observe that SPGE in Ag2Te arises from the difference between two opposite photocurrent flows generated from the top and bottom surfaces. Acting as an efficient SPGE material, Ag2Te demonstrates robust performance across a wide spectral range from visible to mid-infrared, making it promising for applications in solar cells and mid-infrared detectors. More importantly, SPGE generated on low-symmetric surfaces can potentially be found in various systems, thereby inspiring a broader range of choices for photovoltaic materials.

Date: 2024
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DOI: 10.1038/s41467-024-49576-4

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