Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 105, Issue 4, Pages 1003-1009Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-011-6533-7
Keywords
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Funding
- National High Technology Research and Development Program of China [2009AA03Z219]
- 973 Program of China [2011CB933300]
- National Natural Science Foundation of China [11074194]
- Natural Science Foundation of Jiangsu Province [BK2009143]
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The performances of bulk-heterojunction (BHJ) solar cells are investigated for time-dependent thermal annealing with different morphology evolution scales, having special consideration for the diffusion and aggregation of fullerene derivative molecules based on blends of poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM). Meaningfully, rapid formation of dot-like and needle-like crystalline PCBM structures of a few micrometers up to 60 mu m in size is obtained with thermal annealing treatment from 2 to 15 min, which dynamically reflects a fast process of PCBM molecule and cluster aggregation. Upon ultrasonic-assisted processing and annealing treatment, the scale of P3HT crystals is drastically increased in view of X-ray diffraction (XRD) patterns, leading to a high hole mobility. And, the P3HT domains can be gradually converted into larger P3HT crystals approved by the decreased full width at half-maximum in the XRD patterns. Corresponding current-voltage curves are measured in quantity and we propose a model to explain the effect of the crystalline degree of P3HT domains and aggregation of PCBM molecules and clusters on the phase segregation, expressing a viewpoint towards high performance of BHJ solar cells.
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