A new model for PCBM phase segregation in P3HT:PCBM blends

作者：Berriman Garth A; Holmes Natalie P; Holdsworth John L; Zhou Xiaojing; Belcher Warwick J; Dastoor Paul C^*

来源：Organic Electronics, 2016, 30: 12-17.

DOI：10.1016/j.orgel.2015.12.014

• P3HT
• PCBM
• Polymer blends
• Aggregation
• Crystallisation

The phase segregation in P3HT:PCBM blend films has been investigated from an experimental and theoretical viewpoint. Optical microscopy, atomic force microscopy, scanning electron microscopy and X-ray diffraction show that thermal annealing of P3HT: PCBM blend films leads to the formation of PCBM aggregates. These aggregates are composed of dense randomly packed similar to 50 nm PCBM crystallites with an overall aggregate density of similar to 0.85 g cm(-3). By applying the critical radius of nucleation for PCBM and the Stokes-Einstein equation for mobility of PCBM in a P3HT matrix, a model is developed which explains the formation of both crystallites and aggregates.

• 出版日期2016-3