Lead Halide Perovskites in Thin Film Photovoltaics: Background and Perspectives

This review describes the background of our discovery of hybrid perovskite materials as photovoltaic absorbers and the progresses in high efficiency perovskite photovoltaics with focus on solution processes to control quality of polycrystalline layers and low temperature metal oxide preparation for fabrication of thin flexible devices. Future directions of research are discussed including the potential of efficiency enhancement to the Shockley-Queisser limit with single high-voltage devices and environmental issues and solutions towards industrialization of lead halide-based devices.