Enhanced charge photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions

Keshab Paudel, Brian Johnson, Mattson Thieme, Michael M. Haley, Marcia M. Payne, John E. Anthony, Oksana Ostroverkhova

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We examined sub-nanosecond time-scale charge carrier dynamics in crystalline films of a functionalized anthradithiophene (ADT) donor (D) with three different acceptor (A) molecules. A four-fold enhancement in ultrafast charge carrier separation efficiency was observed in D/A blends with a fullerene acceptor added at 7-10wt. % concentrations, whereas a gradual decrease in peak photocurrent amplitude with acceptor concentration was observed with functionalized pentacene and indenofluorene acceptors. The results were directly correlated with the ADT-tri(ethylsilyl)ethynyl-F donor crystallinity. In the best-performing blends, the presence of crystalline acceptor domains was also established.

Original languageEnglish
Article number043301
JournalApplied Physics Letters
Volume105
Issue number4
DOIs
StatePublished - Jul 28 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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