Formation of metastable charges as a first step in photoinduced degradation in π-conjugated polymer:fullerene blends for photovoltaic applications

A. Aguirre de Miguel, S.C.J. Meskers, R.A.J. Janssen, H-J. Egelhaaf

Research output: Contribution to journalArticleAcademicpeer-review

57 Citations (Scopus)
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Abstract

Photoinduced changes in solids films of P3HT and PCPDTBT are studied in order to elucidate the initial stage of photodegradation in polymer solar cells. We find that illumination of the polymers with either UV or visible light in the presence of air induces persistent radical cations on the polymer chains. The radical cations are identified by optical and electron paramagnetic resonance spectroscopy. The photoinduced charges are stable at room temperature for at least hours, but recombine rapidly upon removal of air from the sample chamber. We ascribe the persistent charges to P+-O2- charge pairs that are stabilized by chemical interactions between molecular oxygen and the polymer (P) Formation of persistent charges also takes place in the presence of the fullerene based electron acceptor PCBM.
Original languageEnglish
Pages (from-to)1657-1662
Number of pages5
JournalOrganic Electronics
Volume12
Issue number10
DOIs
Publication statusPublished - 2011

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