Graphene quantum dots (GQDs) have been extensively studied in recent days due to their excellent optical photo-absorption, low-cost synthesis and nontoxic nature. Furthermore, the optical and electronic properties of GQDs can be modulated by adding various dopant (like N, S, B, F, K, Si etc.) and can be used as a potential candidate for green solar energy material. Here, we have synthesized GQDs, N and N, S co-doped GQDs using low-cost hydrothermal process. Quantum dot sensitized solar cells (QDSSCs) were fabricated by sensitizing doped and undoped GQDs with ZnO nanorods. Current-Voltage characteristics of GQD sensitized ZnO NRs, N-GQD sensitized ZnO NRs and S, N-GQD sensitized ZnO NRs have been studied. The superior photovoltaic performance was obtained using S, N co-doped GQDs sensitized ZnO NRs with conversion efficiency ∼0.131∼0.131%, which was 1.75 times higher than undoped GQD sensitized QDSSC device.
