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Updated: Mar 8, 2026
Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
Published on: January 29, 2017
Effects of solvent additive on "s-shaped" curves in solution-processed small molecule solar cells
John A Love1, Shu-Hua Chou2, Ye Huang3
1Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, United States; Institute of Physics and Astronomy, University of Potsdam, Potsdam-Golm 14476, Germany.
Abstract:
A novel molecular chromophore, p-SIDT(FBTThCA8)2, is introduced as an electron-donor material for bulk heterojunction (BHJ) solar cells with broad absorption and near ideal energy levels for the use in combination with common acceptor materials. It is found that films cast from chlorobenzene yield devices with strongly s-shaped current-voltage curves, drastically limiting performance. We find that addition of the common solvent additive diiodooctane, in addition to facilitating crystallization, leads to improved vertical phase separation. This yields much better performing devices, with improved curve shape, demonstrating the importance of morphology control in BHJ devices and improving the understanding of the role of solvent additives.
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