Jump to main content
Jump to site search

Issue 11, 2018
Previous Article Next Article

Photobleaching dynamics in small molecule vs. polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene

Author affiliations

Abstract

Two organic photovoltaic (OPV) donor materials (one polymer and one small molecule) are synthesized from the same constituent building blocks, namely thiophene units, cyclopentathiophene dione (CTD), and cyclopentadithiophene (CPDT). Photobleaching dynamics of these donor materials are then studied under white light illumination in air with blends of PC70BM and the bis-trifluoromethylfullerene 1,7-C60(CF3)2. For both the polymer and small molecule blends, C60(CF3)2 stabilizes the initial rate of photobleaching by a factor of 15 relative to PC70BM. However, once the small molecule:C60(CF3)2 blend bleaches to ∼80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analogous polymer blend. We probe that phenomenon using time-resolved photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C60(CF3)2 acceptor significantly de-mix with time, after which the blend begins to bleach at approximately the same rate as the neat donor sample. The work suggests that perfluoroalkylfullerenes have great potential to stabilize certain OPV active layers toward photodegradation, provided their morphology is stable.

Graphical abstract: Photobleaching dynamics in small molecule vs. polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene

Back to tab navigation

Supplementary files

Publication details

The article was received on 15 Dec 2017, accepted on 19 Feb 2018 and first published on 27 Feb 2018


Article type: Communication
DOI: 10.1039/C7TA10995D
Citation: J. Mater. Chem. A, 2018,6, 4623-4628
  •   Request permissions

    Photobleaching dynamics in small molecule vs. polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene

    L. E. Garner, V. Nellissery Viswanathan, D. H. Arias, C. P. Brook, S. T. Christensen, A. J. Ferguson, N. Kopidakis, B. W. Larson, Z. R. Owczarczyk, J. R. Pfeilsticker, P. C. Ramamurthy, S. H. Strauss, O. V. Boltalina and W. A. Braunecker, J. Mater. Chem. A, 2018, 6, 4623
    DOI: 10.1039/C7TA10995D

Search articles by author

Spotlight

Advertisements