Influence of Active Layer Processing on Electrical Properties and Efficiency of Polymer-Fullerene Organic Solar Cells |
| W. Mech, J. Borysiuk, A. Wincukiewicz, R. Bożek, P. Trautman, M. Tokarczyk, M. Kamińska, K. Korona
Institute of Experimental Physics, Faculty of Physics, University of Warsaw, L. Pasteura 5, PL-02093 Warsaw, Poland |
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| New method of polymer-fullerene composite crystallization was examined as a possible way for efficiency enhancement of polymer organic solar cells. Since the structure of bulk-heterojunction is crucial for its efficiency, there is a strong need for new methods that can control a crystallization process. In this work we studied the crystallization process taking place under thermal annealing in ambient conditions, as well as annealing in a solvent atmosphere. Two polymer compounds, P3HT and PTB7, performing as donor materials were used. The acceptor material in the fabricated bulk heterojunction was [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The spin-coated layers were investigated by optical absorption and X-ray diffraction. We observed significant changes in the crystal structure of some of the annealed layers. The constructed solar cells were examined with use of current-voltage characterization method under AM1.5G sun irradiation, and by photocurrent spectroscopy. In the case of P3HT:PCBM cells significant increase of efficiency was observed, especially after annealing in solvent atmosphere. |
DOI:10.12693/APhysPolA.136.579 PACS numbers: 72.40.+w, 72.80.Le, 78.70.Ck |