A Phase Diagram of the P3HT:PCBM Organic Photovoltaic System: Implications for Device Processing and Performance
A Phase Diagram of the P3HT:PCBM Organic Photovoltaic System: Implications for Device Processing and Performance
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DOI：
10.1021/ma102524a
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发表时间：
2011-04-26
期刊：
影响因子：
5.5
通讯作者：
Donald, Athene M.
中科院分区：
文献类型：
--
作者：
Hopkinson, Paul E.;Staniec, Paul A.;Donald, Athene M.
本文描述了一个结构的相图为铸态的有机光伏系统P3 HT PCBM。通过DMTA和GIWAXS都可以看到在PCBM浓度大于70重量%时向相分离状态转变的证据，并且观察到与纯聚合物相比，低于70重量% PCBM的单相状态下的belnds的玻璃化转变温度升高。观察到纯PCBM在155摄氏度下表现出热转变，这是迄今为止未报道的观察结果-提供了对器件薄膜中常见的微晶的深入了解。液晶相的P3 HT被示出持续在高达41重量%的PCBM的存在下。此外，纯PCBM被证明是显着吸湿性，具有重要的意义，高性能设备的处理。
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.