Li Kuilong, Du Changhui, Gao Honglei, Yin Tianhao, Zheng Luyao, Leng Jiancai, Wang Wenjia
International School For Optoelectronic Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, People's Republic of China.
School of Information and Automation, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, People's Republic of China.
ACS Appl Mater Interfaces. 2022 Jul 27;14(29):33589-33597. doi: 10.1021/acsami.2c09674. Epub 2022 Jul 12.
Recently, two-dimensional (2D) van der Waals (vdWs) heterostructures provided excellent and fascinating platforms for advanced engineering in high-performance optoelectronic devices. Herein, novel ReS/ReSe heterojunction phototransistors are constructed and explored systematically that display high responsivity, wavelength-dependent ambipolar photoresponse (negative and positive), ultrafast and polarization-sensitive detection capability. This photodetector exhibits a positive photoresponse from UV to visible spectrum (760 nm) with high photoresponsivities about 126.56 and 16.24 A/W under 350 and 638 nm light illumination, respectively, with a negative photoresponse over 760 nm, which is mainly ascribed to the ambipolar photoresponse modulated by gate voltage. In addition, profound linear polarization sensitivity is demonstrated with a dichroic ratio of about ∼1.2 at 638 nm and up to ∼2.0 at 980 nm, primarily owing to the wavelength-dependent absorption anisotropy and the stagger alignment of the crystal. Beyond static photodetection, the dynamic photoresponse of this vdWs device presents an ultrafast and repeatable photoswitching performance with a cutoff frequency () exceeding 100 kHz. Overall, this study reveals the great potential of 2D ReX-based vdWs heterostructures for high-performance, ultrafast, and polarization-sensitive broadband photodetectors.
最近，二维（2D）范德华（vdWs）异质结构为高性能光电器件的先进工程提供了出色且引人入胜的平台。在此，构建并系统研究了新型ReS/ReSe异质结光电晶体管，其表现出高响应度、波长依赖的双极性光响应（负和正）、超快和偏振敏感检测能力。该光电探测器在紫外到可见光谱（760 nm）范围内呈现正光响应，在350和638 nm光照下的高光响应度分别约为126.56和16.24 A/W，在760 nm以上呈现负光响应，这主要归因于栅极电压调制的双极性光响应。此外，在638 nm处的二向色比约为1.2，在980 nm处高达约2.0，展示了深刻的线性偏振敏感性，这主要归因于波长依赖的吸收各向异性和晶体的交错排列。除了静态光检测外，该vdWs器件的动态光响应呈现出超快且可重复的光开关性能，截止频率（）超过100 kHz。总体而言，这项研究揭示了基于二维ReX的vdWs异质结构在高性能、超快和偏振敏感宽带光电探测器方面的巨大潜力。
