α-Se光电探测器在空位/掺杂调控作用下的光生电流效应

doi:10.13438/j.cnki.jdzk.2025.04.011

吉首大学学报（自然科学版） ›› 2025, Vol. 46 ›› Issue (4): 73-80.DOI: 10.13438/j.cnki.jdzk.2025.04.011

α-Se光电探测器在空位/掺杂调控作用下的光生电流效应

吴修文，廖文虎

（吉首大学通信与电子工程学院，湖南吉首 416000）

出版日期:2025-07-25 发布日期:2025-08-05
作者简介:吴修文(1999—),男,湖南吉首人,吉首大学通信与电子工程学院硕士研究生,主要从事低维半导体光电器件研究
基金资助:
国家自然科学基金资助项目(11664010,11264013);湖南省自然科学基金资助项目(2021JJ30549,2017JJ2217);湖南省教育厅重点科学研究项目(18A293);吉首大学研究生科研项目(JDY19039,JDY20031)

Vacancy and Doping Modulation Photogalvanic Effect in α-Se Photodetector

WU Xiuwen,LIAO Wenhu

(College of Communication and Electronic Engineering,Jishou University,Jishou 416000,Hunan China)

Online:2025-07-25 Published:2025-08-05

摘要/Abstract

摘要：采用非平衡格林函数结合密度泛函理论的第一性原理计算方法，探究了α-Se光电探测器在空位（Se-空位和SeSe-空位）和掺杂（Te-取代、W-取代、As-取代和Cd-取代）调控作用下的光生电流效应.结果表明，单原子空位能够更大程度破坏器件的空间对称性，产生更强的光电流；As原子掺杂时器件的最大光电流达32.61 a20/photon；Cd原子掺杂时器件消光比高达184.9；器件具有良好的各向异性光响应，在y方向上的可见光吸收更灵敏，在y方向上的最大光响应是x方向的1 369倍.

关键词： α-Se, 光电探测器, 光生电流效应, 各向异性

Abstract: First-principles calculations of nonequilibrium Green's function combined with density functional theory are utilized to investigate the photogalvanic effects of α-Se photodetectors in the presence of single-atom vacancies,two-atom vacancies,and doping with Te,W,As,and Cd atoms.The results demonstrate that the single-atom vacancy can break the spatial symmetry of the device more greatly and generate stronger photocurrent.The maximum photoresponse of 32.61 a20/photon is obtained by doping with As atoms,and the extinction ratio of the device reaches 184.9 when Se atom are replaced by Cd atom,and the device possesses a more sensitive visible-light absorption along the y-direction,and the maximum photoresponse in y-direction is 1 369 times higher than that along the x-direction,showing an excellent anisotropic photoresponse.

Key words: α-Se, photodetectors, photogalvanic effects, anisotropic

吴修文, 廖文虎. α-Se光电探测器在空位/掺杂调控作用下的光生电流效应[J]. 吉首大学学报（自然科学版）, 2025, 46(4): 73-80.

WU Xiuwen, LIAO Wenhu. Vacancy and Doping Modulation Photogalvanic Effect in α-Se Photodetector[J]. Journal of Jishou University(Natural Sciences Edition), 2025, 46(4): 73-80.

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α-Se光电探测器在空位/掺杂调控作用下的光生电流效应

Vacancy and Doping Modulation Photogalvanic Effect in α-Se Photodetector

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