A self-powered photodetector based on two-dimensional boron nanosheets. Issue 9 (21st February 2020)

• Record Type: Journal Article
• Authors: Ma, Dingtao; Wang, Rui; Zhao, Jinlai; Chen, Qianyuan; Wu, Leiming; Li, Delong; Su, Liumei; Jiang, Xiantao; Luo, Zhengqian; Ge, Yanqi; Li, Jianqing; Zhang, Yupeng; Zhang, Han
• Is Part Of: Nanoscale. Volume 12:Issue 9(2020)
• Page Start: 5313
• Page End: 5323
• Publication Date: 2020-02-21
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0nr00005a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : In this work, we demonstrated that B nanosheets can be applied for self-powered photodetectors with superior photoresponsivity and excellent stability. Abstract : Owing to their intriguing characteristics, the ongoing pursuit of emerging mono-elemental two-dimensional (2D) nanosheets beyond graphene is an exciting research area for next-generation applications. Herein, we demonstrate that highly crystalline 2D boron (B) nanosheets can be efficiently synthesized by employing a modified liquid phase exfoliation method. Moreover, carrier dynamics has been systematically investigated by using femtosecond time-resolved transient absorption spectroscopy, demonstrating an ultrafast recovery speed during carrier transfer. Based on these results, the optoelectronic performance of the as-synthesized 2D B nanosheets has been investigated by applying them in photoelectrochemical (PEC)-type and field effect transistor (FET)-type photodetectors. The experimental results revealed that the as-fabricated PEC device not only exhibited a favourable self-powered capability, but also a high photoresponsivity of 2.9–91.7 μA W −1 in the UV region. Besides, the FET device also exhibited a tunable photoresponsivity in the range of 174–281.3 μA W −1 under the irradiation of excited light at 405 nm. We strongly believe that the current work shall pave the path for successful utilization of 2D B nanosheets in electronic and optoelectronic devices. Moreover, the proposed method can be utilized to explore other mono-elemental 2D nanomaterials.