Enhanced photoelectric performance of dual cations quantum dots carbon-based perovskite solar cells with stacked structure

All-inorganic CsPbBr₃ perovskite quantum dots (PQDs) are promising candidates in perovskite solar cells (PSCs) due to its excellent stability. However, the large bandgap of PQDs and expensive materials of hole transport materials (HTMs) and noble metal proposed a major obstacle to promoting the further development of PSCs. Herein, a promising method introducing MA⁺ into the CsPbBr₃ PQDs can well decrease the bandgap. Furthermore, the stacked structure assembled by a photoanode A and black electrode B shows a promising prospect for photovoltaic application, in which the black electrode B, a carbon quantum dots, extracted from molasses was used for simultaneous replacement of metals and HTMs, and each layer employed screen-printing method to deposition in the aspect of fabrication of device. Based on this systematic optimization, the assembled PSCs achieve an enhanced PCE of 1.57%, which demonstrated an obvious improvement in comparison to the pristine device. This study demonstrates a low-cost and facile strategy for the fabrication of efficient PSCs with stacked architecture.