[14a-A402-1~9] 12.5 Organic solar cells

[14a-A402-2] Fabrication and Band Structure Control of Tin-Based Perovskite Semiconductor Films Made from High Purity Materials

〇(M1)Kento Otsuka¹, Jiewei Liu¹, Taketo Handa¹, Tomoya Nakamura¹, Richard Murdey¹, Yoshihiko Kanemitsu¹, Atsushi Wakamiya¹ (1.ICR, Kyoto Univ.)

Keywords:lead free perovskite, photoluminescence lifetime, tin bromide complex

We demonstrate the reduced defect density in tin perovskite thin films fabricated with a new SnBr2 complex by the extended photoluminescence lifetime and increased fluorescence spectrum intensity. Using this highly purified source of Sn2+ and Br–, a series of perovskite thin films were prepared combining various ions on the A and X sites of ASnX3 (A = MA+, FA+, Cs+; X = I–, Br–). The influence of the I/Br and MA/FA/Cs ratios on their physical and electronic properties was systematically evaluated in order to optimize the charge extraction efficiencies in tin perovskite solar cells.