[19a-E101-1~12] 12.5 Organic solar cells

△ [19a-E101-9] Fabrication of CH₃NH₃PbI₃ Thin Films by Bar-coating Method and its NH₄Cl Blend Effect

〇Masashi Murata¹, Meigen Gi¹, Ryotaro Tsuji², Makoto Arita³, Akihiko Fujii¹, Masanori Ozaki¹ (1.Osaka Univ., 2.KANEKA Corp., 3.Kyushu Univ.)

Keywords:perovskite solar cell

Thin film fabrication of a solar cell candidate material, CH₃NH₃PbI₃, was carried out by using a bar-coating technique, which must be appropriate for large-scale production. In the fabricated films, it is found that a crystal axis was uniformly oriented to the out-of-plane direction. Blending NH₄Cl into the coating solution, grain boundaries with voids was eliminated, resulting in the smooth and uniform thin films. It is considered that the NH₄Cl blend was effective for the nucleation and crystal growth rate to be suppressed. Utilizing the thin film as an active layer of solar cell, the improvement of solar cell properties was realized.