Perovskite Precursor Solution Tuned with Polymer Addition for Effective Formation of the Photovoltaic Layer
Mayu Yamaguchi a, Takeo Suga a, Kenichi Oyaizu a, Hiroshi Segawa b, Hiroyuki Nishide a
a Department of Applied Chemistry, Waseda University, Tokyo, Japan
b Research Center for Advanced Science and Technology, The University of Tokyo, 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, Mayu Yamaguchi, 112
Publication date: 23rd October 2018

The perovskite precursor (lead Iodide, methylamine hydroiodide, and methylamine hydrochloride) solution has been reported by using low boiling point solvents, such as acetonitrile [1]. In this presentation, the precursor solution was tuned by adding polymers, such as poly(9-vinylcarbazole) (PVK), polystyrene (PS), and poly(methyl methacrylate) (PMMA), for getting appropriate viscosity for bar-coating. Molecular weight of the used polymers was 2,000-20,000, and different concentration of the solution was tested 1-10 mg/ml. The viscous precursor solution was important for getting 400-500 nm thickness which was showed from the cross-sectional SEM image of perovskite layer. The trace amount coexistence of polymer worked as a nuclei and was scaffolding for perovskite crystal growth to yield high quality perovskite crystals. The perovskite solar cells with 5 × 5 cm was fabricated with one step bar-coating, which yielded high short-circuit current density and power conversion efficiency of >14%. Durability of the cells fabricated with the perovskite precursor containing the polymer was improved.

This work was partially supported by NEDO project, Japan.

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