Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 215, Issue 6, Pages 530-535Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201300717
Keywords
bulk heterojunctions; crystal growth; glass transition temperature; organic photovoltaics; UV-vis spectroscopy
Categories
Funding
- Swedish Research Council
- Swedish Energy Agency
- Chalmers' Areas of Advance Energy, Materials Science, and Nanoscience
- Linnaeus Centre for Bioinspired Supramolecular Function and Design (SUPRA)
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A simple technique is demonstrated based on UV-vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk-heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature (T-g) of the blend. Light scattering due to the presence of micrometer-sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the T-g. This principle is used to deduce this critical parameter for two high-performance photovoltaic blends that are based on a thiophene-quinoxaline and a thiophene-isoindigo copolymer, respectively. High T(g)s of 115 and 145 degrees C promise good thermal stability. image
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