Sub‐nano cluster decoration for the manipulation of the photogenerated carrier behavior of <scp>MoS₂</scp>

Abstract

Abstract For most applications based on the photoelectric effect, uncontrollable photogenerated carrier behavior, such as trapping and recombination, is a common issue that reduces the carrier utilization efficiency. Herein, a sub‐nano cluster (Pd, Ru, and PdRu alloy) decoration strategy is proposed to manipulate the photogenerated carrier behavior in MoS 2 to optimize the optoelectronic properties. After decoration, electrons can flow into sub‐nano cluster through PdS bonds and then return to MoS 2 through RuS bonds at the sub‐nano cluster/MoS 2 interface when holes are left in the channel for collection to achieve efficient carrier separation. In addition, the formation of metalS bonds also leads to the generation of mid‐gap states, which enables light absorption over a wide wavelength range. Therefore, the photodetector based on PdRu/MoS 2 shows broadband photodetection ability from 532 to 1550 nm with high responsivity/external quantum efficiency of 310.8 A W −1 /7 × 10 4 % (532 nm), 4.2 A W −1 /527% (980 nm), and 7.14 mA W −1 /0.5% (1550 nm), as well as a fast response speed (rise/decay time of 11.5/12.0 ms). Our work offers new insight into manipulating the photogenerated carrier behavior to optimize the performance of semiconducting 2D materials for practical optoelectronic applications. image

Topics & Concepts