Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 6, Pages 1587-1591Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp804151a
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Funding
- Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT) [030220]
- FWO [G.0091.07]
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In this work, the phase diagram of poly(3-hexyl thiophene) (P3HT) and [6,6]-phenyl C-61-butyric acid methyl ester (PCBM) blends is measured by means of standard and modulated temperature differential scanning calorimetry. Blends were made by solvent-casting from chlorobenzene, as blends cast from toluene or 1,2-dichlorobenzene prove to retain effects of phase segregation during casting, hindering the determination of the phase diagram. The film morphology of P3HT/PCBM blends cast from chlorobenzene results from a dual crystallization behavior, in which the crystallization of each component is hindered by the other component. A single glass transition is observed for all compositions. The glass transition temperature (T-g) increases with increasing concentration of PCBM: from 12.1 degrees C for pure P3HT to 131.2 degrees C for pure PCBM. The observed T-g defines the operating window for the thermal annealing and explains the long-term instability of both the morphology and the photovoltaic performance of the P3HT/PCBM solar cells.
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