Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Improving the hole-transporting layers (HTL) of Perovskite solar cells often affect the cell performance such as conversion efficiency (η) and stability. Arylamine polymers are potential hole-transporting materials (HTM) to replace the typical HTM spiro-OMeTAD. Arylamine derivatives exhibit an appropriate HOMO level (ca. 5.4 -5.5 eV) and high charge transport ability as the HTM. A series of poly(vinyl triphenylamine)s (PVA) as the HTM were prepared through facile two steps (Wittig reaction and radical polymerization) with high yield.These polymers showed a rapid and reversible redox and an adequate HOMO level. The polymers with molecular weight >10,000 dissolved in organic solvents (THF, chlorobenzene, chloroform and so on) and yielded high quality and tough layers with a thickness of 10 nm or less by simple coatings. The perovskite solar cells fabricated with the polymers provided almost hysteresis-less J-Vcurves with the conversion efficiency of ca. 16 %. By improving the coating procedure and tuning the cell fabrication, the conversion efficiency of ca. 17% was achieved for the 1 cm2 cell.
This work was partially supported by the research project of NEDO, Japan
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