A Solution-Processed Spinel CuCo2O4 as an Effective Hole Transport Layer for Efficient Perovskite Solar Cells with Negligible Hysteresis

摘要： Optimal optoelectronic properties of interfacial layers in perovskite solar cells are essential for achieving high power conversion efficiency. We herein demonstrated a solution-processed spinel CuCo2O4 as a hole transport layer to use in high-performance perovskite solar cells. The solution-processed CuCo2O4 possessed high electrical conductivity, high optical transparency in UV-Vis-NIR, well-matched energy levels to perovskite and efficient hole transport capability to perovskite layer. The optoelectronic properties of CuCo2O4 was finely controlled by optimizing the annealing temperature, leading to 14.12% power conversion efficiency in planar perovskite solar cells. Another impressive advantage for CuCo2O4-based hole transport layer is a negligible hysteresis of the device at very low scan rate, that brought highly stable and reliable photovoltaic performance. All the results studied in this work suggest the bright future of solution-processed CuCo2O4 as a novel hole transport layer in perovskite solar cells with high efficiency and good stability.