A graphene–Mo2C heterostructure for a highly responsive broadband photodetector
Literature Information
Xiaozhi Bao, Tian Sun, Yan Liu, Chuan Xu, Weiliang Ma, Junpo Guo, Yun Zheng, Shivananju Bannur Nanjunda, Huating Liu, Zongyu Huang, Shenghuang Lin, Guichuan Xing, Wencai Ren, Qiaoliang Bao, Huaiyu Shao
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 Mo2C). The graphene–Mo2C 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 Mo2C. Consequently, photodetectors based on the graphene–Mo2C heterostructure deliver a very high responsivity from visible to infrared telecommunication wavelengths.
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