Study of molybdenum oxide optimized hole carrier transport in perovskite solar cells

Organic/inorganic perovskite solar cells have dramatically improved in efficiency in recent years and have a trend to be comparable to silicon solar cells, its simple process is expected to become an alternative to silicon solar cells in the future. However, in perovskite solar cells, the ineffective carrier extraction leads to nonradiative recombination of some carriers during the diffusion from the perovskite layer to other transport layers, which is a cause of cell efficiency loss. This paper describes the introduction of solid particles of molybdenum oxide of a certain particle size dispersed between the perovskite layer/hole transport layer to improve the extraction of hole carriers, resulting in an improved device short-circuit current density. We further investigated the dependence of the comprehensive performance of the molybdenum oxide incorporated perovskite solar cell on the amount of molybdenum oxide introduced, and the current density-voltage results showed that the optimal content of molybdenum oxide was 0.5 mg/ml, and the efficiency of the perovskite solar cell at this content was 18.27% with a short-circuit current density of 23.67 mA center dot cm(-2), while the efficiency of the device without molybdenum oxide was 16.97% with a short-circuit current density of 21.84 mA center dot cm(-2). Therefore, this work provides an effective way to improve the efficiency of perovskite solar cells.