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International Journal of Photoenergy
Volume 2015 (2015), Article ID 238981, 8 pages
Research Article

Morphology versus Vertical Phase Segregation in Solvent Annealed Small Molecule Bulk Heterojunction Organic Solar Cells

1Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic
2Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 109 Akademik G. Bonchev Street, P.O. Box 95, 1113 Sofia, Bulgaria
3Institute of Physics, Academy of Sciences of the Czech Republic v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

Received 16 September 2015; Accepted 11 October 2015

Academic Editor: Cheuk-Lam Ho

Copyright © 2015 Alexander Kovalenko et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The deep study of solvent annealed small molecules bulk heterojunction organic solar cells based on DPP(TBFu)2 : PC60BM blend is carried out. To reveal the reason of the solvent annealing advantage over the thermal one, capacitance-voltage measurements were applied. It was found that controlling the vertical phase segregation in the solar cells a high fullerene population in the vicinity of the cathode could be achieved. This results in increase of the shunt resistance of the cell, thus improving the light harvesting efficiency.