Development of Large Size Perovskite Solar Cells Fabrication Technique by Spray Coating
Takayuki Shimizu a, Mitsuhiro Adachi a, Akira Suzuki a, Rie Watanabe a, Mareedu Sreenivasu a, Devoju Harinada Chary a, Satish Bykkam a, Katsuya Tsuchimoto a, Junji Nakajima b, Toshiyuki Sano b, Shoichi Doi b, Katsuyoshi Mizumoto b
a AISIN COSMOS R&D Co., Ltd., Kariya, Aichi 448-8650, Japan
b AISIN SEIKI Co., Ltd., Kariya, Aichi 448-8650, 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, Takayuki Shimizu, 119
Publication date: 23rd October 2018

Responding to global warming is an urgent issue towards a sustainable society. Expansion of renewable energy replacing fossil fuels is expected to spread. Photovoltaic power generation is one promising answer. Among photovoltaic devices, the perovskite solar cell (PSC) which has a sudden improvement in conversion efficiency, is an attractive technology. Therefore, we are conducting research and development activities in synthesis of low-cost materials, and establishing low-cost fabrication methods of PSCs.

Spiro-OMeTAD still is the most widely used small molecule hole transport material (HTM) for PSCs. However, it is relatively expensive among the component materials of PSCs. In order to reduce power generation costs, replacing with low-cost material is crucial. So, we focused on phthalocyanine which is used extensively as pigments and organic semiconductors, and synthesized various derivatives as soluble HTM. In this presentation, we show the evaluation results of the PSC with around 15 % of efficiency using our phthalocyanine derivative. It shows phthalocyanine will become the solution for HTM's cost problem.

On the other hand, we are applying spray coating method to fabricate a perovskite light absorbing layer. Usually, just spraying precursor solution without a following anti-solvent process gives us needle-like perovskite. Adding methylammonium chloride to the precursor solution and optimizing spray conditions resulted in fine perovskite layer and over 10 % of cell conversion efficiency. Finally, we made small test modules with spray coating method with average conversion efficiency of 13 %.

This presentation is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

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