Efficient Pb- or Sn-based perovskite solar cells based on highly purified materials

Abstract

Our approaches toward efficient lead and lead-free perovskite solar cells are i) development of highly-purified perovskite precursor materials, ii) Development of solution process fabrication methods for the perovskite layer, and iii) Development 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.