Photosynthetic biohybrid techniques primarily based on purple micro organism and semiconducting nanomaterials are promising platforms for sustainable solar-powered chemical manufacturing. Nevertheless, some of these biohybrid techniques haven’t been absolutely developed thus far, and their power utilization and electron switch mechanisms will not be properly understood. Herein, a Rhodospirillum rubrum-CdS biohybrid system was efficiently constructed. The photosynthetic exercise and photoelectrochemical properties of the biohybrid system had been analyzed. Chromatographic and spectroscopic research confirmed the metabolic actions of R. rubrum cells had been successfully augmented by surface-deposited CdS nanoparticles and validated with elevated H2 evolution, polyhydroxybutyrate (PHB) manufacturing and stable biomass accumulation. Power consumption and metabolic profiles of R. rubrum-CdS biohybrid system exhibited a development phase-dependent behaviour. Photoelectrochemical research confirmed that light-excited electrons from CdS enhanced photosynthetic electron circulate of R. rubrum cells. Monochromatic gentle modulated photoexcitation of biohybrid system was utilized to discover interfacial electron switch between CdS and R. rubrum cells, and the outcomes confirmed that CdS enhanced the utilization of blue gentle by R. rubrum cells. This work investigated the feasibility and prospect of using R. rubrum in semi-artificial photosynthesis of priceless merchandise, and provided insights into the power utilization and the electron switch mechanism between nanomaterials and purple micro organism.