P3HT was solubilized by adding 1670 μL of the P3HT stock solution (0.5 mg mL -1 ) in chloroform to a 7-dram vial. The solvent was evaporated by a flow of air to form a film on the walls of the vial. A NaDC solution (200 mM, 5.0 mL) was added, and the sample was stirred with a magnetic stirrer for one week after which the sample was sonicated for 90 min (Branson 1510 water bath sonicator) and then centrifuged to remove remaining film particles. These samples were kept at rest for two weeks leading to a decrease of the solution's light scattering. Clear yellow solutions were obtained with a P3HT concentration of 0.027 mg mL -1 and a NaDC concentration of 200 mM. For lower P3HT concentrations, the P3HT/NaDC solutions were diluted using NaDC solutions. The concentrations of P3HT in NaDC were determined by using an estimated molar absorption coefficient since P3HT is not soluble in water but is soluble in chloroform. This estimate was determined from the ratio of the molar absorption coefficients of OTPh in chloroform and NaDC solutions and the molar absorption coefficient of P3HT in chloroform.