Additive-Morphology Interplay and Loss Channels in “All-Small-Molecule” Bulk-heterojunction (BHJ) Solar Cells with the Nonfullerene Acceptor IDTTBM

Ru-Ze Liang, Maxime Babics, Akmaral Seitkhan, Kai Wang, Paul Bythell Geraghty, Sergei Lopatin, Federico Cruciani, Yuliar Firdaus, Marco Caporuscio, David J. Jones, Pierre Beaujuge

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26 Scopus citations

Abstract

Achieving efficient bulk-heterojunction (BHJ) solar cells from blends of solution-processable small-molecule (SM) donors and acceptors is proved particularly challenging due to the complexity in obtaining a favorable donor–acceptor morphology. In this report, the BHJ device performance pattern of a set of analogous, well-defined SM donors—DR3TBDTT (DR3), SMPV1, and BTR—used in conjunction with the SM acceptor IDTTBM is examined. Examinations show that the nonfullerene “All-SM” BHJ solar cells made with DR3 and IDTTBM can achieve power conversion efficiencies (PCEs) of up to ≈4.5% (avg. 4.0%) when the solution-processing additive 1,8-diiodooctane (DIO, 0.8% v/v) is used in the blend solutions. The figures of merit of optimized DR3:IDTTBM solar cells contrast with those of “as-cast” BHJ devices from which only modest PCEs
Original languageEnglish (US)
Pages (from-to)1705464
JournalAdvanced Functional Materials
Volume28
Issue number7
DOIs
StatePublished - Dec 15 2017

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