ABSTRACT
The first reports of organic-inorganic halide perovskites appeared in 1884 and 1892 followed by reports of methyl-ammonium lead halide and formamidinium lead halide in 1978 and in 1995 which are commonly used in state of the perovskite solar cells. Together with sufficient carrier mobilities, long carrier lifetime and long diffusion lengths make these organic metal halide perovskites favorable for photovoltaics. Cui et al. demonstrated preparation of four different color-tuned perovskites by direct contact of the lead halide films with a heated methylamine halide powder which works by intercalation. Power conversion efficiencies obtained from the continuous perovskites were found to be more than the compressing and the columnar perovskite. K. Yao et al. studied a series of two-dimensional layered perovskites fabricated by incorporating polyethylenimine in the layered structures. The optical absorption coefficient of the material was found to be 105/cm which indicates that very thin layers would suffice for adequate absorption.
