(Invited) CH3NH3PbI3 Perovskite Solar Cells on Inorganic Materials: CuSCN and Crystal Silicon

Organo-lead halide perovskites have attracted much attention for solar cell applications due to their unique optical and electrical properties. With either low-temperature solution processing or vacuum evaporation, the overall conversion efficiencies of perovskite solar cells with organic hole-transporting material were quickly improved to over 20% during the last 3 years.  However, the organic hole-transporting materials used are normally quite expensive due to complicated synthetic procedure or high-purity requirement.  Here, we demonstrate the application of an effective and cheap inorganic p-type hole-transporting material, copper thiocyanate (CuSCN), on lead halide perovskite-based devices.  With low-temperature solution-process deposition method, a power conversion efficiency of 12.4% was achieved under full sun illumination.  This work represents a well-defined cell configuration with optimized perovskite morphology by two times of lead iodide deposition, and opens the door for integration of a class of abundant and inexpensive material for photovoltaic application.  Moreover, in the conference presentation, stability study of perovskite crystal and tandem solar cells (perovskite solar cells on home-made silicon solar cells) will be presented.