Abstract:
There have several advantages for perovskite solar cells, for instance, solution-process, low cost, and high-power conversion efficiency, etc. Recently, it has been attracting much attention from academics and industry. As reported, the performance decay and instability of the perovskite solar cells (PSCs), which is attributed to the loss of interfacial non-radiative recombination (NRR), resulting in such NRR losses originating from the surface defect of perovskite, compatible of the interfacial materials, and the energy level, etc. Graphene is a specific two-dimension structure and superiors conductive property. In this project, we plan to develop the graphene nanosheet (GNS) materials systematically, such as tuning the platelet size and the degree of oxidation state. The GNS can be employed as the interfacial materials to improve the charge transporting and collecting efficiency at the interface. To further investigate the platelet size of GNS impact on the p-p stacking, charge transport, and performance. Moreover, we also have been developed the functionalized GNS, due to its functional group is coordinated with the atomic of perovskite to passivate the surface defect, reduce trap-density and charge-trap, as well as restrict the ion moving ability of perovskite, and further improve the device’s stability. Finally, we anticipate understanding the relationship of these factors between performance and stability.
platelet size impact on the p-p stacking, and the degree of oxidation state of GNS is influence with the electronic properties.
When the charge undergoing the interfacial non-radiative recombination (NRR), resulting in the performance decay
Hence, in this project, we plan to develop the graphene nanosheet (GNS) materials systematically, tuning the platelet size and the degree of oxidation state to vary the electronic properties. Afterward, we employ these GNS materials as an interfacial layer, passivation layer, and additives in the PSC, after incorporating the various dopant atomic and salt. To investigate the differences of improvement the ability of interfacial NRR loss through those three kinds of actors, understanding the main factor of the NRR loss. Meanwhile, we can find out the relationship between the GNS and its derivatives, performance, and the device’s stability. It has been concluded a principle for selecting GNS materials by overall investigations to realize the high performance and stability of PSCs.