Duan Research Group

Hetero-integrated Nanostructures and Nanodevices


Graphene charge-injection photodetectors

Wei Liu, Jianhang Lv, Li Peng, Hongwei Guo, Chen Liu, Yilun Liu, Wei Li, Lingfei Li, Lixiang Liu, Peiqi Wang, Srikrishna Chanakya Bodepudi, Khurram Shehzad, Guohua Hu, Kaihui Liu, Zhipei Sun, Tawfique Hasan, Yang Xu, Xiaomu Wang, Chao Gao, Bin Yu, Xiangfeng Duan

Nature Electronics 5, 281-288 (2022)

Charge-coupled devices are widely used imaging technologies. However, their speed is limited due to the complex readout process, which involves sequential charge transfer between wells, and their spectral bandwidth is limited due to the absorption limitations of silicon. Here we report graphene charge-injection photodetectors. The devices have a deep-depletion silicon well for charge integration, single-layer graphene for non-destructive direct readout and multilayer graphene for infrared photocharge injection. The photodetectors offer broadband imaging from ultraviolet (around 375 nm) to mid-infrared (around 3.8 μm), a conversion gain of 700 pA per electron, a responsivity above 0.1 A W−1 in the infrared region and a fast response time under 1 μs.
UCLA, Department of Chemistry and Biochemistry
607 Charles E. Young Drive East, Box 951569
Los Angeles, CA 90095-1569
E-mail: xduan@chem.ucla.edu