Tune the photoresponse of monolayer MoS2 by decorating CsPbBr3 perovskite nanoparticles

Tuning the photoresponse of monolayer MoS2could extend its potential application in many fields,however,it is still a challenge.In this study,CsPbBr3nanoparticles were prepared and spin-coated on the surface of monolayer MoS2to fabricate hybrid CsPbBr3/MoS2photodetectors.By combing the photoelectrical property of the CsPbBr3,the synergistic effect has been systematically studied from its carrier mobility,photoresponse and detectivity.It was found that nanofilm-coating of CsPbBr3would impede the photoelectric performance due to the electron-hole recombination facilitated by the defects at the interface of C PbBr3and MoS2films.While the nanoparticles decorating was observed to significantly improve the conductivity of the monolayer Mo S2,which also increased the on/off ratio of the MoS2transistor from 8.2×103to 4.4×104,and enhanced the carrier mobility from 0.090 cm2V-1s-1to 0.202 cm2V-1s-1,ascribing to a mixed electron recombination-injection process.Furthermore,the CsPbBr3nanofilm would decrease the responsivity to 136 and 178 A/W under the light wavelength of 400 and 500 nm,respectively,while decorating CsPbBr3nanoparticles improve the photoresponse to 948 and 883 A/W with the detectivity at the level of 1011Jones.This work may provide an easy and cost-efficient way to tune the photoresponse of MoS2photodetectors.