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Issue 45, 2014
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Optimisation of diketopyrrolopyrrole:fullerene solar cell performance through control of polymer molecular weight and thermal annealing

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Abstract

Poly-thieno[3,2b]thiophene-diketopyrrolopyrrole-co-thiophene (DPP-TT-T) is a promising low bandgap donor polymer for organic solar cells. In this study we employ two different approaches to improve the device efficiency via optimisation of the morphology of the active layer: tuning of the molecular weight of the polymer and thermal annealing. In the former case, a higher molecular weight was found to yield a more intermixed morphology, resulting in enhanced exciton dissociation and charge separation, as confirmed by atomic force microscopy, and photoluminescence and transient absorption spectroscopies. In the later case, thermal annealing prior to metal electrode deposition increased the photon conversion efficiency to as high as 6.6%, with this enhanced efficiency being maintained even with prolonged annealing (240 hours at 80 °C). This enhancement in performance with thermal annealing was correlated with increased polymer crystallinity.

Graphical abstract: Optimisation of diketopyrrolopyrrole:fullerene solar cell performance through control of polymer molecular weight and thermal annealing

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Publication details

The article was received on 14 Jul 2014, accepted on 30 Sep 2014 and first published on 30 Sep 2014


Article type: Paper
DOI: 10.1039/C4TA03589E
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 19282-19289
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    Optimisation of diketopyrrolopyrrole:fullerene solar cell performance through control of polymer molecular weight and thermal annealing

    Z. Huang, E. C. Fregoso, S. Dimitrov, P. S. Tuladhar, Y. W. Soon, H. Bronstein, I. Meager, W. Zhang, I. McCulloch and J. R. Durrant, J. Mater. Chem. A, 2014, 2, 19282
    DOI: 10.1039/C4TA03589E

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