Abstract

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 (20mg/mL). Detailed investigation on electronic absorption and fluorescence spectroscopy revealed, for the dissolution of P3HT aggregates, a critical temperature regime (27–33°C) with a middle-point temperature (Tm∼29°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.

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