Highly Purified Materials for Sn-and Pb-Based Perovskite Solar Cells

Abstract

Perovskite solar cells are promising cost-effective next generation printable photovoltaics. These solar cells have attracted the interest of many researchers. Thanks to tremendous effort of the researchers in this field, the power conversion efficiencies (PCEs) have been substantially increased in a short period, which is mainly due to improvements of the fabrication protocols for the perovskite layer as well as the development of new materials for buffer layers.Our approaches toward efficient lead and lead-free perovskite solar cells are as follows: Development of highly-purified perovskite precursor materialsDevelopment of solution process fabrication methods for the perovskite layerDevelopment of organic semiconductors for efficient charge-collection layers We have synthesized lead-halide and tin halide complexes as purified precursors for perovskite materials, which were later commercialized by TCI and are now widely used in this field as standard precursor materials. We also focus on the intermediates formed during the film-growth and have developed efficient fabrication methods based on the formation mechanism. We have designed and synthesized novel pi-conjugated materials designed to control frontier orbital energy levels, molecular aggregation properties, and the interface with the perovskite layer.In this talk, our recent progress on tin halide perovskite solar cells as well as lead halide perovskites will be introduced.