[18p-P09-1~54] 12.5 Organic and hybrid solar cells

[18p-P09-18] Exploration of substitution elements in organic-inorganic perovskite compounds

〇Kohei Takasaki¹, Naomu Sekiguchi¹, Qing Wang¹, Yuta Tsuji¹, Atsushi Wakamiya², Tomoya Nakamura², Satoshi Iikubo¹ (1.Kyushu Univ., 2.Kyouo Univ.)

Keywords:

perovskite,solar cell,first principle

Perovskite solar cells use MAPbI₃(MA=CH₃NH_{3⁺) as a light-absorbing layer, and due to the toxicity of Pb, Sn is being considered as an alternative element. However, Sn perovskites have a problem that electrons and holes recombine due to defect levels formed in the band gap, resulting in a decrease in photoelectric conversion efficiency. In this study, we have searched for a substitute element that lowers the levels of the conduction band (CBM) and valence band (VBM) of Sn perovskites and changes the defect level to a shallower level in the band gap as a countermeasure for this defect level.}