[13p-P9-1~38] 12.5 Organic solar cells

[13p-P9-35] Effects of TiCl₄ treatment of porous TiO₂ on performance of perovskite solar cell

〇Takashi Harada¹, Hasyiya Karimah Adli¹, Seigo Ito², Shuji Nakanishi¹, Shigeru Ikeda³ (1.Osaka Univ., 2.Univ. of Hyogo, 3.Konan Univ.)

Keywords:Perovskite solar cell, porous TiO2

The effects of TiCl₄ post-treatment on the physicochemical properties of porous TiO₂ (pTiO₂) layers fabricated at 300 °C and 400 °C in CH₃NH₃PbI₃ perovskite photovoltaic cells were investigated. In the case of pTiO₂ fabricated at 300 °C, the content of water was increased by the TiCl₄ post-treatment due to the removal of residual organic compounds that existed before the treatment. It then caused a change in the surface activity of pTiO₂ and enhancement of solar cell performance, though suppression of CH₃NH₃PbI₃ perovskite formation occurred. In comparison, contents of water were decreased for pTiO₂ fabricated at 400 °C, leading to enhancement of the conversion of PbI₂ to CH₃NH₃PbI₃ perovskite. As a result, there were significant increases in efficiency. The results showed that TiCl₄ post-treatment is an effective approach to prepare high-performance CH₃NH₃PbI₃ perovskite solar cells without heat treatment at a very high temperature.