用于高响应宽带光电探测器的石墨烯-碳化钼异质结构

A graphene-MoC heterostructure for a highly responsive broadband photodetector.

作者信息

Bao Xiaozhi, Sun Tian, Liu Yan, Xu Chuan, Ma Weiliang, Guo Junpo, Zheng Yun, Nanjunda Shivananju Bannur, Liu Huating, Huang Zongyu, Li Shaojuan, Lin Shenghuang, Xing Guichuan, Ren Wencai, Bao Qiaoliang, Shao Huaiyu

机构信息

Guangdong-Hong Kong-Macau Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macao SAR 999078, China.

Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, P. R. China.

出版信息

Phys Chem Chem Phys. 2021 Oct 20;23(40):23024-23031. doi: 10.1039/d1cp03536c.

DOI:10.1039/d1cp03536c

PMID:34612268

Abstract

Photodetectors based on intrinsic graphene can operate over a broad wavelength range with ultrafast response, but their responsivity is much lower than commercial silicon photodiodes. The combination of graphene with two-dimensional (2D) semiconductors may enhance the light absorption, but there is still a cutoff wavelength originating from the bandgap of semiconductors. Here, we report a highly responsive broadband photodetector based on the heterostructure of graphene and transition metal carbides (TMCs, more specifically MoC). The graphene-MoC heterostructure enhanced light absorption over a broad wavelength range from ultraviolet to infrared. In addition, there is very small resistance for photoexcited carriers in both graphene and MoC. Consequently, photodetectors based on the graphene-MoC heterostructure deliver a very high responsivity from visible to infrared telecommunication wavelengths.

摘要

基于本征石墨烯的光电探测器可在很宽的波长范围内工作，具有超快响应，但它们的响应度远低于商用硅光电二极管。石墨烯与二维（2D）半导体的结合可能会增强光吸收，但仍存在源自半导体带隙的截止波长。在此，我们报道了一种基于石墨烯与过渡金属碳化物（TMCs，更具体地说是MoC）异质结构的高响应宽带光电探测器。石墨烯-MoC异质结构在从紫外到红外的很宽波长范围内增强了光吸收。此外，石墨烯和MoC中光激发载流子的电阻都非常小。因此，基于石墨烯-MoC异质结构的光电探测器在可见光到红外通信波长范围内具有非常高的响应度。