[24a-E206-1~13] 12.5 Organic solar cells

△ [24a-E206-12] Composition-Property Mapping in ASnI_3–xBr_x Tin Perovskite

〇Tomoya Nakamura¹, Kento Otsuka¹, Shuaifeng Hu¹, Tarou Morishita¹, Ruito Hashimoto¹, Taketo Handa¹, Yoshihiko Kanemitsu¹, Minh Anh Truong¹, Richard Murdey¹, Atsushi Wakamiya¹ (1.ICR, Kyoto Univ.)

Keywords:perovskite, solar cells, tin

Tin halide perovskites are solution-processable semiconductors with the general formula ASnX₃ (A = monovalent cation, X = halide). The wide bandgaps of bromide-containing ASnI_3–xBr_x materials make them attractive candidates for use as the top-layer absorber in tandem solar cells, as well as in single junction solar cells for indoor applications. In the present work, compositional-property mapping was realized by systematically changing the A-site (FA⁺, MA⁺, Cs⁺) and X-site (I^–, Br^–) ions of a series of ASnI_3–xBr_x films fabricated using our original high-purity starting materials. The energy levels and electronic properties of the films were characterized by photoemission spectroscopy (PYS) and photoluminescence (PL) measurements.