Simultaneous enhancement of solar cell efficiency and stability by reducing the side chain density on fluorinated PCPDTQx copolymers

Pieter Verstappen, Jurgen Kesters, Lien D’Olieslaeger, Jeroen Drijkoningen, Ilaria Cardinaletti, Tim Vangerven, Bardo Bruijnaers, Robin Willems, Jan D'Haen, Jean V. Manca, Laurence Lutzen, Dirk J.M. Vanderzande, Wouter Maes

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
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Abstract

The performance of polymer solar cells is strongly dependent on the morphology of the photoactive layer, which can be optimized by tuning the polymer side chain pattern. Whereas most studies focus on length and bulkiness, the side chain density receives much less attention. In this work, the effect of the number of side chains on PCPDTQx(2F) low bandgap copolymers on material properties and solar cell characteristics is investigated. The active layer morphology is strongly affected, affording more favorable finely intermixed blends when decreasing the side chain density. As a result, the efficiency increases to a maximum of 5.63% for the device based on the copolymer with intermediate side chain density. Moreover, removal of the side chains also has a positive effect on device stability under prolonged thermal stress. A single structural parameter—alkyl side chain density—is hence used for simultaneous enhancement of both solar cell efficiency and lifetime
Original languageEnglish
Pages (from-to)3873-3882
JournalMacromolecules
Volume48
Issue number12
DOIs
Publication statusPublished - 2 Jun 2015

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