Journal
CHINESE PHYSICS B
Volume 24, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1674-1056/24/7/078401
Keywords
polymer solar cell (PSC); additive; morphology; grazing incidence x-ray diffraction (GIXRD)
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Funding
- National Natural Science Foundation of China [51272022, 11474018]
- Research Fund for the Doctoral Program of Higher Education of China [20120009130005]
- Fundamental Research Funds for the Central Universities of China [2012JBZ001]
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Crystallographic dynamics of blend films of regioregular poly(3-hexylthiophene) (P3HT) mixed with [6-6-]-phenyl-C61-butyric acid methyl ester (PC61BM) treated by thermal annealing or by adding solvent 1,8-diiodooctane (DIO) are characterized by 2D-grazing incidence x-ray diffraction (2D-GIXRD). The results show that the P3HT chains are primarily oriented with the thiophene ring edge-on to the substrate, with a small fraction of chains oriented plane-on. The interplanar spacing becomes narrow after being treated by DIO, and the coherence length of the P3HT crystallites increases after being treated by thermal annealing or DIO, which is accompanied by a change in the orientation angle of the P3HT lamellae. The increased ordering of P3HT packing induced by thermal annealing or adding DIO contributes to enhanced photovoltaic performance.
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