Chen Xiaoqing, Shehzad Khurram, Gao Li, Long Mingsheng, Guo Hui, Qin Shuchao, Wang Xiaomu, Wang Fengqiu, Shi Yi, Hu Weida, Xu Yang, Wang Xinran
School of Microelectronics, Xidian University, Xian, 710071, China.
National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Adv Mater. 2020 Jul;32(27):e1902039. doi: 10.1002/adma.201902039. Epub 2019 Jul 8.
Graphene (Gr) has many unique properties including gapless band structure, ultrafast carrier dynamics, high carrier mobility, and flexibility, making it appealing for ultrafast, broadband, and flexible optoelectronics. To overcome its intrinsic limit of low absorption, hybrid structures are exploited to improve the device performance. Particularly, van der Waals heterostructures with different photosensitive materials and photonic structures are very effective for improving photodetection and modulation efficiency. With such hybrid structures, Gr hybrid photodetectors can operate from ultraviolet to terahertz, with significantly improved R (up to 10 A W ) and bandwidth (up to 128 GHz). Furthermore, integration of Gr with silicon (Si) complementary metal-oxide-semiconductor (CMOS) circuits, the human body, and soft tissues is successfully demonstrated, opening promising opportunities for wearable sensors and biomedical electronics. Here, the recent progress in using Gr hybrid structures toward high-performance photodetectors and integrated optoelectronic applications is reviewed.
石墨烯（Gr）具有许多独特的性质，包括无带隙能带结构、超快载流子动力学、高载流子迁移率和柔韧性，这使其在超快、宽带和柔性光电子学领域具有吸引力。为了克服其低吸收率的固有局限性，人们利用混合结构来提高器件性能。特别是，具有不同光敏材料和光子结构的范德华异质结构对于提高光探测和调制效率非常有效。利用这种混合结构，Gr混合光电探测器可以在从紫外线到太赫兹的波段工作，其响应度（R）显著提高（高达({\rm{10}};{\rm{A}};{\rm{W}}^{ - 1})），带宽也显著提高（高达128 GHz）。此外，Gr与硅（Si）互补金属氧化物半导体（CMOS）电路、人体和软组织的集成已成功实现，为可穿戴传感器和生物医学电子学开辟了广阔的前景。在此，本文综述了利用Gr混合结构实现高性能光电探测器及集成光电子应用的最新进展。
