Materials Science for Fabrication of High Performance Perovskite Solar Cells
Atsushi Wakamiya a
a Institute for Chemical Research, Kyoto University, Gokasyo, Uji, 611, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Invited Speaker Session, Atsushi Wakamiya, presentation 060
Publication date: 7th November 2016

Perovskite solar cells have attracted much attention as cost-effective next generation printable photovoltaics. Power conversion efficiencies (PCEs) in such cells have been substantially increased in a relatively short period, mainly on account of improvements of the fabrication protocols for the perovskite layer as well as the development of new materials for buffer layers. In this presentation, our approaches toward development of high PCE cells in terms of materials science are introduced.

Regarding the molecular design for organic semiconductors that are used as p-type buffer layer in perovskite solar cells, we have reported that the use of partially oxygen-bridged triarylamines as quasiplanar scaffolds for charge-transporting materials facilitates delocalized pi-conjugation and on-top pi-stacking in the solid state, which ensures high carrier mobilities in the pi-stacking direction. In this study, we designed and synthesized the two-dimensionally expanded system (HND-Azulene) with a sheet-shaped structure, in which four oxygen-bridged triarylamines that contain alkoxy groups to enhance the solubility were attached to an azulene core skeleton. Using HND-Azulene as a HTM in perovskite solar cells led to high PCEs, even compared to Spiro-OMeTAD. In this presentation, we will report our recent progress on the development of new buffer material as well as our optimized protocol of perovskite layer deposition method.

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