A graphene–Mo2C heterostructure for a highly responsive broadband photodetector. Issue 40 (6th October 2021) - Bao, Xiaozhi
Abstract : A photodetector based on a graphene–Mo2 C heterostructure delivers very high responsivities from visible to infrared telecommunication wavelengths. 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 Mo2 C). The graphene–Mo2 C 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 Mo2 C. Consequently, photodetectors based on the graphene–Mo2 C heterostructure deliver a very high responsivity from visible to infrared telecommunication wavelengths.