Arylamine Polymers Prepared with a Very Facile Addition Condensation and their Application as a Hole Transporting Layer of Perovskite Solar Cells
Koki Suwa a, Hirofumi Maruo a, Kenichi Oyaizu a, Hiroyuki Nishide a, Hiroshi Segawa b
a Department of Advanced Science and Engineering, Waseda University, okubo3-4-1, Shinjuku, Tokyo, 169-8555, 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
Poster, Koki Suwa, 048
Publication date: 7th November 2016

Hole-transporting materials are one of the keys for improving the conversion efficiency, durability, and preparation cost of perovskite solar cells. Arylamine polymers are amorphous hole-transporting materials with high hole mobility and durability. Arylamine polymers were prepared with high yield via very simple one-step addition condensation of triphenylamine and phenylenediamine derivatives (substituted with methyl or methoxy groups) with paraldehyde under moderate conditions (80°C, 4h). Molecular weights of the polymers were in 6.9×103 ~ 1.6×104. The polymers were highly soluble in organic solvents (THF, chloroform, chlorobenzene and so on) via alkyl groups of the main chain and showed high glass transition temperatures (Tg>200°C). The polymers formed thin layers by spin-coating which were amorphous, homogeneous and tough. The polymers substituted with electron donating groups gave appropriate HOMO levels (-5.25−5.40 eV) for a mixed-cation perovskite solar cell. The cells yielded the conversion efficiency of 14 % and high durability or long life-time.

This work was partially supported by the research project of NEDO, Japan.

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