Beyond Methylammonium Lead Iodide Perovskite

This chapter discusses development of novel lead (Pb)-based perovskites as well as the development of Pb-free alternatives. The nanostructuring approach to direct the growth of multidimensional perovskites is an interesting strategy to solve the charge-transport challenges in multidimensional perovskites to create high-efficiency and stable perovskite solar cells (PSCs). The chapter presents a review of the theoretical calculations and experimental validation of lead-free halide perovskites and their solar cell applications. The idea of double perovskites is not new, with the analogous oxide structures having been examined for a long time. Such atomic transmutation has been successful in even thin-film solar cell application such as the copper zinc tin sulfide (CZTS) systems. More environment-friendly Pb-free perovskites should be studied theoretically and experimentally in order to achieve a better fundamental understanding on optoelectronics, which helps in designing a good Pb-free perovskite for photovoltaics (PVs).