[16a-303-1~12] 12.5 Organic solar cells

[16a-303-1] Application of Two-Dimensional Perovskite to Solar Cells (III)-Fabrication of New Quasi-2D Perovskite-

〇(M1C)Ryuki Hamaguchi^1,2, Masahiro Fujita¹, Yuko Takeoka^1,2, Masahiro Rikukawa¹ (1.Sophia Univ., 2.ALCA)

Keywords:perovskite solar cell, 2D perovskite, stability

Due to high moisture stability, quasi-2D (q-2D) perovskite compound, whose general formula is (RNH₃)₂B_n-1Pb_nX_3n+1, has attracted much attention as a perovskite solar cell (PSC) material. It is notable that only CH₃NH₃⁺ (abbreviated as MA) has been used as the B site cation for such PSCs. As well, to the best of our knowledge, there have been no reports about quasi-2D perovskite compounds in which the B site cation is CH(NH₂)₂⁺ (abbreviated as FA) or Cs⁺, although FAPbX₃ and CsPbX₃ are common compounds in this field. In this study, we report the fabrication of (RNH₃)₂B_n-1Pb_nX_3n+1 containing FA and Cs. Q-2D perovskite compounds, which consist of hexylammonium (HA) iodide, lead iodide and MAI, FAI, or CsI as a B-site cation were fabricated by spin-coating method. These films were investigated by out-of-plane and in-plane XRD measurements. Formation of q-2D perovskite structure in each sample was confirmed by XRD measurement. Each sample was applied to mesoscopic cell. Photovoltaic properties of HA₂FAPb₂I₇ was superior to other samples because of unique crystalline growth, which suits to charge transport.