The high-performance photodetector of MoS2 homojunction based on laser etching engineering

Achieving fast response is critical to pushing photodetectors based on molybdenum disulfide to practical applications. Here, by constructing a few/multi-layer grating-like homojunction through selective laser etching of multi-layer MoS2, the photodetectors with ultrafast response have been successfully realized. The rise time and the fall times of the photodetector we built are 7.27 ms and 6.86 ms, respectively. This photodetector forms a built-in electric field, thus enabling the device to realize the self-driven detection function. This study provides a simple approach to preparing patterned gratings, and then to achieving on-demand preparation of function optoelectronic devices based on 2D layered materials.