Improved performance in 0D/2D mixed dimensional homojunction MoS2 photodetectors by enhancing light absorption

Abstract Molybdenum disulfide (MoS2) possesses excellent potential for applications in the field of optoelectronic detection. However, the atomic-level thickness of the monolayer MoS2 leads to weak light absorption and a restricted absorption spectrum. The performance of monolayer MoS2 devices has reached a bottleneck. Fortunately, the above issues can be effectively solved by coupling with various types of photosensitivity nanostructures. In this work, a 0D/2D MoS2 QDs/MoS2 hybrid dimensional homojunction photodetector was fabricated by utilizing the synergistic effect to combine the light absorption efficiency of MoS2 QDs and the optoelectronic performance of MoS2 films. Optical and electrical studies have shown that the incorporation of MoS2 QDs improved the light utilization efficiency of monolayer MoS2 as well as the separation velocity of photogenerated carriers, which enhanced the performance of the monolayer MoS2 photodetector benefitting from increasing the responsivity and detectivity across the entire spectrum of wavelength bands. The results will pave the way for the future development of high-performance MoS2-based photodetectors.