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We report that we can enhance the performance of polymer photovoltaics by introducing materials with dipoles at the donor–acceptor interface of the polymer solar cells. We use a zwitterionic conjugated polyelectrolyte (ZCPE) as an interfacial layer in a model bi-layer system consisting of donor and acceptor polymers. We find an increase in short-circuit current and fill factor when a 2 nm thin layer of ZCPE is introduced between donor and acceptor polymers. Absorption of light in the ZCPE interlayer contributes to the photocurrent, and, as revealed by time-resolved pump–push optical spectroscopy, the interlayer reduces the probability of electron–hole recombination at the donor–acceptor interface.
Royal Society of Chemistry
Publication date: 
1 Jan 2013

Abhishek Kumar, Giuseppina Pace, Artem A Bakulin, Junfeng Fang, Peter KH Ho, Wilhelm TS Huck, Richard H Friend, Neil C Greenham

Biblio References: 
Volume: 6 Issue: 5 Pages: 1589-1596
Energy & Environmental Science