Hole transporting materials in inorganic CsPbI3−Br solar cells: Fundamentals, criteria and opportunities

Inorganic cesium lead halide (i.e., CsPbI3−xBrx) perovskite solar cells have made great breakthroughs in the last years with power conversion efficiency beyond 20%, thermal and photo stability reaching hundreds of hours. Hole transporting materials, as important building blocks in perovskite solar cells, present significant influences on both performance and stability. Understanding the energy loss mechanisms and failure pathways of inorganic...