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Issue 11, 2009
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Influence of alkyl substituents and thermal annealing on the film morphology and performance of solution processed, diketopyrrolopyrrole-based bulk heterojunction solar cells

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Abstract

A solution processable diketopyrrolopyrrole-containing oligothiophene was blended with a series of methanofullerene acceptors having different alkyl substitutents—[6,6]-phenyl C61 butyric acid methyl (PC6161BM) ester, [6,6]-phenyl C61 butyric acid hexyl ester (PC6161BH) and [6,6]-phenyl C61 butyric acid dodecyl ester (PC6161BD) to study the effect of donor–acceptor interactions on the blend film morphology and device characteristics of small molecule-based bulk heterojunction (BHJ) solar cells. A combination of characterization techniques including X-ray diffraction, atomic force microscopy, conducting atomic force microscopy, and transmission electron microscopy was used to investigate the film morphology and phase separation. The results show that changing the length of the alkyl substituent on the methanofullerene acceptor is a good approach to control the film morphology of blended films and these lead to significant differences on the performance of the as cast and annealed devices. Power conversion efficiencies between 2–3% can be reached by simple variation of the alkyl chain length.

Graphical abstract: Influence of alkyl substituents and thermal annealing on the film morphology and performance of solution processed, diketopyrrolopyrrole-based bulk heterojunction solar cells

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Publication details

The article was received on 29 Jun 2009, accepted on 30 Jul 2009 and first published on 14 Aug 2009


Article type: Paper
DOI: 10.1039/B912824G
Citation: Energy Environ. Sci., 2009,2, 1180-1186
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    Influence of alkyl substituents and thermal annealing on the film morphology and performance of solution processed, diketopyrrolopyrrole-based bulk heterojunction solar cells

    A. Tamayo, T. Kent, M. Tantitiwat, M. A. Dante, J. Rogers and T. Nguyen, Energy Environ. Sci., 2009, 2, 1180
    DOI: 10.1039/B912824G

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