A Phase Diagram of the P3HT:PCBM Organic Photovoltaic System: Implications for Device Processing and Performance

作者：Hopkinson Paul E^*; Staniec Paul A; Pearson Andrew J; Dunbar Alan D F; Wang Tao; Ryan Anthony J; Jones Richard A L; Lidzey David G; Donald Athene M

来源：Macromolecules, 2011, 44(8): 2908-2917.

DOI：10.1021/ma102524a

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.

• 出版日期2011-4-26