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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