Tunable Contacts of Bi<sub>2</sub>O<sub>2</sub>Se Nanosheets MSM Photodetectors by Metal‐Assisted Transfer Approach for Self‐Powered Near‐Infrared Photodetection
Guangcan Wang, Fengjing Liu, Ruichang Chen, Mingxu Wang, Yanxue Yin, Jie Zhang, Zixu Sa, Pengsheng Li, Junchen Wan, Li Sun, Zengtao Lv, Yang Tan, Feng Chen, Zaixing Yang
Abstract
Abstract Owing to the Fermi pinning effect arose in the metal electrodes deposition process, metal–semiconductor contact is always independent on the work function, which challenges the next‐generation optoelectronic devices. In this work, a metal‐assisted transfer approach is developed to transfer Bi 2 O 2 Se nanosheets onto the pre‐deposited metal electrodes, benefiting to the tunable metal–semiconductor contact. The success in Bi 2 O 2 Se nanosheets transfer is contributed to the stronger van der Waals adhesion of metal electrodes than that of growth substrates. With the pre‐deposited asymmetric electrodes, the self‐powered near‐infrared photodetectors are realized, demonstrating low dark current of 0.04 pA, high I light / I dark ratio of 380, fast rise and decay times of 4 and 6 ms, respectively, under the illumination of 1310 nm laser. By pre‐depositing the metal electrodes on polyimide and glass, high‐performance flexible and omnidirectional self‐powered near‐infrared photodetectors are achieved successfully. This study opens up new opportunities for low‐dimensional semiconductors in next‐generation high‐performance optoelectronic devices.