Spontaneous configurational evolution induced by an in situ self-formed p-type CuI interface layer in perovskite solar cells

The undesirable corrosion reaction between CH3NH3PbI3 and Cu cathode can form a p-type CuI layer in situ. The effect can promote an amazing evolution of the configuration of the hole-transportmaterial- free perovskite solar cells. The evolution can boost the cell efficiency by a dozen-fold.