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Issue 24, 2014
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The role of solvent vapor annealing in highly efficient air-processed small molecule solar cells

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Abstract

We demonstrate highly-efficient, solution-processed small molecule solar cells with the best power conversion efficiency (PCE) of more than 5%. The active layer consists of a diketopyrrolopyrrole-based donor molecule (DPP(TBFu)2) and a fullerene derivative (PC71BM) that is spin cast and subsequently treated with solvent vapor annealing (SVA) in air. We find not all solvent vapors lead to the best PCE. Solvents of high vapor pressures and medium donor solubilities, such as tetrahydrofuran or carbon disulfide, are most suitable for SVA in the context of organic solar cell application. On the other hand, acceptor solubility plays an insignificant role in such a treatment. An active layer treated with ideal solvent vapors develops desirable phase separation in both lateral and vertical directions, as revealed by AFM, TEM and TEM tomography. The SVA also leads to enhanced hole mobility. We believe the fast SVA treatment performed in air is a viable way to tune the active layer morphology for printed solar cells.

Graphical abstract: The role of solvent vapor annealing in highly efficient air-processed small molecule solar cells

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Publication details

The article was received on 06 Mar 2014, accepted on 17 Mar 2014 and first published on 19 Mar 2014


Article type: Paper
DOI: 10.1039/C4TA01125B
Citation: J. Mater. Chem. A, 2014,2, 9048-9054
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    The role of solvent vapor annealing in highly efficient air-processed small molecule solar cells

    K. Sun, Z. Xiao, E. Hanssen, M. F. G. Klein, H. H. Dam, M. Pfaff, D. Gerthsen, W. W. H. Wong and D. J. Jones, J. Mater. Chem. A, 2014, 2, 9048
    DOI: 10.1039/C4TA01125B

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