Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
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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