Low‐Symmetry 2D t‐InTe for Polarization‐Sensitive UV‐Vis‐NIR Photodetection

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-10, Vol.20 (40), p.e2400311-n/a
• Main Authors: Zhou, Nan, Dang, Ziwei, Li, Haoran, Sun, Zongdong, Deng, Shijie, Li, Junhao, Li, Xiaobo, Bai, Xiaoxia, Xie, Yong, Li, Liang, Zhai, Tianyou
• Format: Article
• Language: English
• Subjects: 2D t‐InTe; Anisotropy; Broadband; Crystal lattices; Infrared imaging; Infrared radar; low‐symmetry; Near infrared radiation; Optoelectronics; Polarization; polarization‐sensitive; Radar imaging; Symmetry; Two dimensional materials; UV‐vis‐NIR photodetection; Visual perception
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202400311

Polarization‐sensitive photodetection grounded on low‐symmetry 2D materials has immense potential in improving detection accuracy, realizing intelligent detection, and enabling multidimensional visual perception, which has promising application prospects in bio‐identification, optical communications, near‐infrared imaging, radar, military, and security. However, the majority of the reported polarized photodetection are limited by UV–vis response range and low anisotropic photoresponsivity factor, limiting the achievement of high‐performance anisotropic photodetection. Herein, 2D t‐InTe crystal is introduced into anisotropic systems and developed to realize broadband‐response and high‐anisotropy‐ratio polarized photodetection. Stemming from its narrow band gap and intrinsic low‐symmetry lattice characteristic, 2D t‐InTe‐based photodetector exhibits a UV–vis–NIR broadband photoresponse and significant photoresponsivity anisotropy behavior, with an exceptional in‐plane anisotropic factor of 1.81@808 nm laser, surpassing the performance of most reported 2D counterparts. This work expounds the anisotropic structure‐activity relationship of 2D t‐InTe crystal, and identifies 2D t‐InTe as a prospective candidate for high‐performance polarization‐sensitive optoelectronics, laying the foundation for future multifunctional device applications. 2D t‐InTe crystal is developed to realize broadband‐response and high‐anisotropy polarized photodetection. Originating from its narrow band gap (≈1.28 eV) and low‐symmetry crystal structure, 2D t‐InTe‐based photodetector demonstrates a UV–vis–NIR broadband photoresponse with excellent near‐infrared photodetection performance, and strong anisotropic photoresponsivity with an exceptional anisotropy factor of 1.81@808 nm, confirming its promise for high‐performance polarized optoelectronics.