The Physics of Small Molecule Acceptors for Efficient and Stable Bulk Heterojunction Solar Cells

Nicola Gasparini, Andrew Wadsworth, Maximilian Moser, Derya Baran, Iain McCulloch, Christoph J. Brabec

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Organic bulk heterojunction solar cells based on small molecule acceptors have recently seen a rapid rise in the power conversion efficiency with values exceeding 13%. This impressive achievement has been obtained by simultaneous reduction of voltage and charge recombination losses within this class of materials as compared to fullerene-based solar cells. In this contribution, the authors review the current understanding of the relevant photophysical processes in highly efficient nonfullerene acceptor (NFA) small molecules. Charge generation, recombination, and charge transport is discussed in comparison to fullerene-based composites. Finally, the authors review the superior light and thermal stability of nonfullerene small molecule acceptor based solar cells, and highlight the importance of NFA-based composites that enable devices without early performance loss, thus resembling so-called burn-in free devices.
Original languageEnglish (US)
Pages (from-to)1703298
JournalAdvanced Energy Materials
Volume8
Issue number12
DOIs
StatePublished - Jan 29 2018

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