The device performance determines the application scenario of photodetectors, and how to design the photodetector is thus the key to improve the performance. In this paper, the effect of channel size parameters on the performances of the graphene/MoS2 heterojunction photodetector is investigated based on the photogating effect. The experimental results show that reducing the channel size between the electrodes or increasing the contact size between the material and electrode can increase the photocurrent and reduce the response time. Compared to normal devices, this optimized device has a photocurrent increase of nearly five times and a response time reduction of nearly four times. This work provides a new idea for the design and fabrication of high-performance optoelectronic device.
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