Reconfigurable two-dimensional optoelectronic devices enabled by local ferroelectric polarization

Liang Lv; Fuwei Zhuge; Fengjun Xie; Xujing Xiong; Qingfu Zhang; Nan Zhang; Yu Huang; Tianyou Zhai

doi:10.1038/s41467-019-11328-0

Reconfigurable two-dimensional optoelectronic devices enabled by local ferroelectric polarization

Nat Commun. 2019 Jul 26;10(1):3331. doi: 10.1038/s41467-019-11328-0.

Authors

Liang Lv¹, Fuwei Zhuge², Fengjun Xie¹, Xujing Xiong¹, Qingfu Zhang¹, Nan Zhang¹, Yu Huang¹, Tianyou Zhai³

Affiliations

¹ State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, People's Republic of China.
² State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, People's Republic of China. zhugefw@hust.edu.cn.
³ State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, People's Republic of China. zhaity@hust.edu.cn.

Abstract

Ferroelectric engineered pn doping in two-dimensional (2D) semiconductors hold essential promise in realizing customized functional devices in a reconfigurable manner. Here, we report the successful pn doping in molybdenum disulfide (MoS₂) optoelectronic device by local patterned ferroelectric polarization, and its configuration into lateral diode and npn bipolar phototransistors for photodetection from such a versatile playground. The lateral pn diode formed in this way manifests efficient self-powered detection by separating ~12% photo-generated electrons and holes. When polarized as bipolar phototransistor, the device is customized with a gain ~1000 by its transistor action, reaching the responsivity ~12 A W^-1 and detectivity over 10¹³ Jones while keeping a fast response speed within 20 μs. A promising pathway toward high performance optoelectronics is thus opened up based on local ferroelectric polarization coupled 2D semiconductors.