A critical temperature regime for poly(3-hexylthiophene) dissolution in concentrated solutions of ortho-dichlorobenzene

作者：Liu, Yu Chen; Liang, Ran; Fu, Li Min; Ren, Fang; Zhang, Jian Ping^*

来源：Chemical Physics Letters, 2015, 631: 78-82.

DOI：10.1016/j.cplett.2015.04.055

• HETEROJUNCTION SOLAR-CELLS
• POLYMER PHOTOVOLTAIC CELLS
• SELF-ORGANIZATION
• THIN-FILMS
• MORPHOLOGY
• EFFICIENCY
• MOBILITY
• P3HT
• POLYTHIOPHENE
• PERFORMANCE

We report the thermo-assisted dissolution of aggregated regioregular poly(3-hexylthiophene) (P3HT) in ortho-dichlorobenzene (o-DCB) at a concentration level that is typical for photovoltaic applications (20 mg/mL). Detailed investigation on electronic absorption and fluorescence spectroscopy revealed, for the dissolution of P3HT aggregates, a critical temperature regime (27-33 degrees C) with a middle-point temperature (T-m similar to 29 degrees C) and an aggregation-degree dependent endothermic dissolution enthalpy. In this temperature regime, pre-resonant Raman spectroscopy results showed a drastic variation of solvent-solute interaction in the solvation sphere of P3HT. In addition, an annealing treatment to the concentrated solution is proven to be rather effective in minimizing P3HT agglomeration.

• 出版日期2015-7-1
• 单位中国人民大学