One-step Preparation of the Perovskite Layer by Bar-coating of the Perovskite Ink
Akihiro OKADA a, Yuta SHIROGANE a, Takeo SUGA a, Kenichi OYAIZU a, Hiroshi SEGAWA b, Hiroyuki NISHIDE a
a Department of Applied Chemistry, Waseda University, Japan
b Department of General System Studies, Graduate School of Arts and Sciences, The University of Tokyo, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Akihiro OKADA, 124
Publication date: 23rd October 2018

Hybrid perovskite solar cells have attracted great attention due to high power conversion efficiency (PCE) over 20%. One of the remaining challenges is large scale fabrication of the device, which requires scalable coating methods using such as slot-dyes, coating blades, and ink-jets, alternative to spin-coating. Commonly used anti-solvent method is quite sensitive to the coating and drying conditions, thus we report here the preparation of the perovskite (precursor) inks and optimized the coating conditions.

Perovskite crystal of MAPbI3 was prepared from methylammonium iodide (MAI), lead iodide (PbI2) as a precipitate, and re-dissolved in solution as an ink by addition of methylamine (MA)/methanol vapor. Low boiling point solvents, such as acetonitrile1) and chloroform were selected. After deposition of perovskite ink on the substrate, the black perovskite layer was immediately appeared by removal of MA and solvents. Active layer thickness and the composition of perovskite layer was optimized by addition of methylammonium chloride to the perovskite ink, resulted in higher-quality perovskite layer formation, which was verified by the cross-sectional SEM-EDX analysis. The power conversion efficiency was ~16%.

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