Enhanced optoelectronic characteristics of MoS2-based photodetectors through hybridization with CdSSe nanobelt

Abstract

Monolayer molybdenum disulfide (MoS2) has weak light absorption due to its atomically-thin thickness, thus hindering the development of MoS2-based optoelectronic devices. CdSxSe[Formula: see text] has excellent photoelectric performance in the visible light range, and its nanostructure shows great potential in new nanoscale electronic and optoelectronic devices. In this work, a composite photodetector device with the combination of monolayer MoS2 nanosheets and CdS[Formula: see text]Se[Formula: see text] nanobelts has been successfully prepared, which can not only maintain the inherent excellent properties of the two blocks, but also play a synergistic role between them, thus improving the photoelectric performance of the device. The monolayer MoS2 nanosheet /CdS[Formula: see text]Se[Formula: see text] nanobelt photodetector has a wide spectral response range (400–800[Formula: see text]nm), high responsivity (527.22[Formula: see text]A/W) and large external quantum efficiency (EQE) ([Formula: see text]%). Compared with the isolated monolayer MoS2 nanosheet, both the responsivity and EQE of the hybrid photodetector are increased by 117.4 times under 620[Formula: see text]nm illumination. This study provides a way to prepare hybrid photodetectors with wide spectral response and high responsivity.

Keywords

• Monolayer MoS2
• CdSSe nanobelt
• photodetectors