Stable flexible photodetector based on FePS3/reduced graphene oxide heterostructure with significant enhancement in photoelectrochemical performance.

Herein, FePS3/reduced graphene oxide (rGO) heterostructure has been prepared via a typical hydrothermal process, and flexible photodetectors based on hybrids have been subsequently fabricated. The photoresponse measurement results demonstrate that the photodetector exhibits obvious photoelectric conversion behavior without applied potential, indicating the device possesses capability of self-powered. In addition, the photocurrent density of as-fabricated photodetectors reaches up to 125 nA/cm2 under 90 mW/cm2 of illumination intensity without external power source, which is 5.86 times higher than sole FePS3-based devices. Furthermore, the maximum attenuation in photocurrent density of as-fabricated flexible photodetectors measured at -0.3 V after different bending cycles and bending angles are 29.8 % and 17.7 %, respectively. These results demonstrate that as-fabricated photodetectors have excellent flexibility and provide a simple and effective strategy for the construction of flexible photodetector.