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Issue 45, 2014
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Comparison of additive amount used in spin-coated and roll-coated organic solar cells

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Abstract

All-polymer and polymer/fullerene inverted solar cells were fabricated by spin-coating and roll-coating processes. The spin-coated small-area (0.04 cm2) devices were fabricated on indium tin oxide (ITO) coated glass substrates in nitrogen. The roll-coated large-area (1.0 cm2) devices were prepared on ITO-free flexible substrates under ambient conditions. The use of a solvent additive, 1,8-diiodooctane (DIO), facilitated phase separation and enhanced power conversion efficiencies (PCEs). The PCE of polymer/fullerene solar cells increased from 4.58% to 8.12% with 2.5% (v/v) DIO when using the spin-coating process, and increased from 1.37% to 2.09% with 5% (v/v) DIO in the roll-coating process. The PCE of all-polymer solar cells increased from 1.44% to 3.51% with 4% (v/v) DIO when employing the spin-coating process. For the roll-coated large area devices the PCE increased from 0.15% to 0.73% with 9% (v/v) DIO. The optimal amounts of DIO, when using the roll-coating process for the two different active layers (5% and 9% respectively) are significantly higher than those for the spin-coating process (2.5% and 4%, respectively), which is ascribed to a fundamentally different drying mechanism.

Graphical abstract: Comparison of additive amount used in spin-coated and roll-coated organic solar cells

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Publication details

The article was received on 18 Sep 2014, accepted on 07 Oct 2014 and first published on 07 Oct 2014


Article type: Paper
DOI: 10.1039/C4TA04906C
Citation: J. Mater. Chem. A, 2014,2, 19542-19549
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    Comparison of additive amount used in spin-coated and roll-coated organic solar cells

    P. Cheng, Y. Lin, N. K. Zawacka, T. R. Andersen, W. Liu, E. Bundgaard, M. Jørgensen, H. Chen, F. C. Krebs and X. Zhan, J. Mater. Chem. A, 2014, 2, 19542
    DOI: 10.1039/C4TA04906C

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