[14a-303-1~10] 12.5 Organic solar cells

[14a-303-4] Spectroscopic study on the defect structures and molecular motions in organometal halide perovskite films(III)

〇Hironori Ogata^1,2,3, Takamasa Takeuchi¹, Hiroya Kiuchi¹ (1.Hosei Univ., 2.Grad.School. Sci. and Engin., Hosei Univ., 3.Res. Center Micro-Nano, Hosei Univ.)

Keywords:Perovskite Solar Cells, Raman Scattering spectroscopy, solid NMR Spectroscopy

Thin film photovoltaic cells based on hybrid organic/inorganic perovskite absorbers, such as methylammonium lead halide CH₃NH₃PbX₃ (X=Cl, Br, or I) have recently attracted great interests because of their advanced photovoltaic properties since they has led to the improvement in the power conversion efficiency up to 20 %. The comprehension of defect properties in actual organometal halide perovskite films is a critical requirement to design and process these films with higher photovoltaic performance. However, the fundamental understanding concerning the defect properties remains unknown. In this study, we investigated the defect structures and properties of molecular motions of methylammonium cation which related with phase transition behavior in CH3NH3PbBr3 films and single crystals with different process by means of Raman spectroscopy and solid-state NMR spectroscopy.