气候变化领域集成服务门户(CCPortal): Low symmetric sub-wavelength array enhanced lensless polarization- sensitivity photodetector of germanium selenium

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DOI	10.1016/j.scib.2023.01.013
	Low symmetric sub-wavelength array enhanced lensless polarization- sensitivity photodetector of germanium selenium
	Zhou, Ziqi; Shen, Tao; Wang, Pan; Guo, Quanlin; Wang, Qinghe; Ma, Chenjun; Xin, Kaiyao; Zhao, Kai; Yu, Yali; Qin, Biao; Liu, Yue-Yang; Yang, Juehan; Hong, Hao; Liu, Kaihui; Liu, Can; Deng, Hui-Xiong; Wei, Zhongming
发表日期	2023
ISSN	2095-9273
EISSN	2095-9281
起始页码	173
结束页码	179
卷号	68 期号:2 页码:7
英文摘要	Polarization-sensitive photodetectors, with the ability of identifying the texture-, stress-, and roughness-induced light polarization state variation, displace unique advantages in the fields of national security, medical diagnosis, and aerospace. The utilization of in-plane anisotropic two-dimensional (2D) materials has led the polarization photodetector into a polarizer-free regime, and facilitated the miniaturization of optoelectronic device integration. However, the insufficient polarization ratio (usually less than 10) restricts the detection resolution of polarized signals. Here, we designed a sub-wavelength array (SWA) structure of 2D germanium selenium (GeSe) to further improve its anisotropic sensitivity, which boosts the polarized photocurrent ratio from 1.6 to 18. This enhancement comes from the combination of nano-scale arrays with atomic-scale lattice arrangement at the low-symmetric direction, while the polarization-sensitive photoresponse along the high-symmetric direction is strongly suppressed due to the SWA-caused depolarization effect. Our mechanism study revealed that the SWA can improve the asymmetry of charge distribution, attenuate the matrix element in zigzag direction, and the localized sur -face plasma, which elevates the photo absorption and photoelectric transition probability along the arm-chair direction, therefore accounts for the enhanced polarization sensitivity. In addition, the photodetector based on GeSe SWA exhibited a broad power range of 40 dB at a near-infrared wavelength of 808 nm and the ability of weak-light detection under 0.1 LUX of white light (two orders of magnitude smaller than pristine 2D GeSe). This work provides a feasible guideline to improve the polarization sen-sitivity of 2D materials, and will greatly benefit the development of polarized imaging sensors.(c) 2023 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
英文关键词	Germanium selenium (GeSe); Polarization-sensitive photodetectors; Sub-wavelength array; Anisotropy ratio
学科领域	Multidisciplinary Sciences
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS记录号	WOS:000945918700001
来源期刊	SCIENCE BULLETIN
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/274013
作者单位	Chinese Academy of Sciences; Institute of Semiconductors, CAS; Peking University; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Renmin University of China
推荐引用方式 GB/T 7714	Zhou, Ziqi,Shen, Tao,Wang, Pan,et al. Low symmetric sub-wavelength array enhanced lensless polarization- sensitivity photodetector of germanium selenium[J],2023,68(2):7.
APA	Zhou, Ziqi.,Shen, Tao.,Wang, Pan.,Guo, Quanlin.,Wang, Qinghe.,...&Wei, Zhongming.(2023).Low symmetric sub-wavelength array enhanced lensless polarization- sensitivity photodetector of germanium selenium.SCIENCE BULLETIN,68(2),7.
MLA	Zhou, Ziqi,et al."Low symmetric sub-wavelength array enhanced lensless polarization- sensitivity photodetector of germanium selenium".SCIENCE BULLETIN 68.2(2023):7.