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Issue 30, 2015
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Solvent vapor annealing on perylene-based organic solar cells

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Diindenoperylene (DIP) and tetraphenyldibenzoperiflanthene (DBP) are two commonly used donor materials in organic solar cell devices. Despite their structural similarities, DIP films are crystalline, exhibiting good charge and exciton transport, whereas DBP films are amorphous and have lower carrier mobility and a short exciton diffusion length. However, DBP reveals a distinctly higher absorption due to the lying orientation of its transition dipole moments. In this paper, we investigate the influence of solvent vapor annealing (SVA) on the solar cell performance of both materials. In general, SVA induces a partial re-solubilization of the material leading to enhanced crystallinity of the treated layer. For DBP, extended annealing times result in a strong aggregation of the molecules, creating inhomogeneous layers unfavorable for solar cells. However, in DIP cells, SVA leads to an increase in fill factor (FF) and also a slight increase in short-circuit current density (JSC) due to interface roughening. The best results are obtained by combining solvent vapor annealed DIP layers with strongly absorbing DBP and C70 on top. Through this device architecture, we obtain the same increase in FF in addition to a higher gain in JSC, elevating the power conversion efficiency by a factor of 1.2 to more than 4%.

Graphical abstract: Solvent vapor annealing on perylene-based organic solar cells

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The article was received on 17 Apr 2015, accepted on 29 Jun 2015 and first published on 02 Jul 2015

Article type: Paper
DOI: 10.1039/C5TA02806J
Citation: J. Mater. Chem. A, 2015,3, 15700-15709
  • Open access: Creative Commons BY-NC license
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    Solvent vapor annealing on perylene-based organic solar cells

    S. Grob, A. N. Bartynski, A. Opitz, M. Gruber, F. Grassl, E. Meister, T. Linderl, U. Hörmann, C. Lorch, E. Moons, F. Schreiber, M. E. Thompson and W. Brütting, J. Mater. Chem. A, 2015, 3, 15700
    DOI: 10.1039/C5TA02806J

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