Simulation Photosynthesis Improves the Photoresponse Performance of Cr2Ge2Te6 Nanosheets for High-Performance Self-Powered Photoelectrochemical Photodetectors

Two-dimensional (2D) semiconductor materials have beenextensivelystudied as excellent candidates for future optoelectronic devices.Cr2Ge2Te6, as a two-dimensional semiconductormaterial, has attracted extensive interest in the field of photodetectorsdue to its excellent light absorption properties and suitable bandgap. Inspired by biological photosynthesis, this study constructeda high-performance biomimetic self-powered photoelectrochemical-typeflexible photodetector using liquid-stripped Cr2Ge2Te6 nanosheets as the photoanode. The device exhibitsobvious self-powered photoresponse behavior and excellent photoresponseperformance with a responsivity of 54.4 mu A/W. Furthermore, theaddition of nicotinamide adenine dinucleotide phosphate (NADPH) effectivelyconsumes the photo-excited holes on the Cr2Ge2Te6 nanosheets to inhibit the recombination of photogeneratedelectron-hole pairs, and the cyclic regeneration of NADPH isrealized by adding adenosine triphosphate. In addition, the flexiblephotodetector also exhibits excellent stability and durability, andit still maintains good photoresponse characteristics after 1000 timesof bending and folding. Our work fully confirms that it is an effectivemeans to improve the photoresponse performance of 2D materials bysimulating biological photosynthesis, and it also provides theoreticaland experimental guidance for the research and development of high-performancebiomimetic devices.