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

[16a-303-5] Fabrication of high coverage CH₃NH₃SnI₃ perovskite films using solvent bathing method

〇Takashi Fujihara¹, Shinobu Terakawa², Toshinori Matsushima², Chuanjiang Qin², Masayuki Yahiro¹, Chihaya Adachi^1,2 (1.ISIT, 2.Opera Kyushu Univ.)

Keywords:lead free perovskite solar cell, fabrication method, solvent bathing

In this work, the influence of the formation speed from the precursor to the perovskite on the film quality and its photovoltaic properties was evaluated in lead free MASnI₃ perovskite films. The formation speed was directly controlled by employing the mixed solvent as a poor-solvent in the solvent bathing method. Employing the appropriate formation speed, a high coverage MASnI₃ perovskite film with smooth surface was obtained. The solar cells using this perovskite film showed the efficiency of 2.14 ± 0.35% and the open circuit voltage of 0.45 ± 0.01 V. We propose that the significant reproducibility in efficiency and the comparably high open circuit voltage of our MASnI₃ perovskite solar cells is due to the high surface coverage of the perovskite film, which was achieved using the modified solvent bathing method.