Journal
MACROMOLECULES
Volume 44, Issue 8, Pages 2908-2917Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma102524a
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Funding
- EPSRC [EP/F016433/1, EP/F016255/1, EP/F017057/1, EP/F019297/1]
- Engineering and Physical Sciences Research Council [EP/F017057/1, EP/F019297/1, EP/F016255/1, EP/F016433/1, EP/E046215/1] Funding Source: researchfish
- EPSRC [EP/F016255/1, EP/F019297/1, EP/E046215/1, EP/F017057/1, EP/F016433/1] Funding Source: UKRI
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This paper describes the construction of a phase diagram for the as-cast state in the organic photovoltaic system P3HT PCBM. Evidence for a transition to a phase-separated state at PCBM concentrations greater than 70 wt % is seen both by DMTA and GIWAXS, and the glass transition temperatures of belnds in the single phase state below 70 wt % PCBM are observed to be raised compared to the pure polymer. Pure PCBM is observed to exhibit a thermal transition at 155 degrees C, an observation unreported to date-offering-insight into crystallites commonly seen in device films. The liquid-crystal phase of P3HT is shown to persist in the presence of up to 41 wt % PCBM. In addition, pure PCBM is shown to be significantly hygroscopic, with important implications for the processing of high-performance devices.
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