A one-step method to synthesize CH3NH3PbI3:MoS2 nanohybrids for high-performance solution-processed photodetectors in the visible region

Abstract

A facile method to synthesize a CH3NH3PbI3: MoS2 nanohybrid for high-performance solution-processed photodetectors is presented. The interfacial charge carriers transfer due to the existence of heterojunctions between the 2D MoS2 nanosheet and perovskite cuboids are utilized to enhance the device performance. The dark current of the photodiode Au/CH3NH3PbI3: MoS2/Au was suppressed and its photocurrent was enhanced when compared to a pristine perovskite nanocrystal device Au/CH3NH3PbI3/Au. The lowest dark current of 0.34 × 10−9 A was observed from the photodiode Au/CH3NH3PbI3: MoS2/Au and the photoresponsivity and photosensitivity increased from 312 mA W−1 to 696 mA W−1 and from 9.02 to 87.47, respectively, showing an enhancement of 123.1% and 869.7%. Also, the rising time and falling time were reduced from 73 ms to 50 ms and 60 ms to 16 ms, respectively, when compared to those for the pristine perovskite nanocrystal-based photodiode Au/CH3NH3PbI3/Au. Therefore, this method provides a simple and effective approach to synthesize 2D nanosheet blended organic–inorganic nanohybrids for application in optoelectronic devices.