The isoindigo-based copolymers such as high-MW PII-2T [number-average MW (Mn) = 230,174 g/mol, weight-average MW (Mw) = 715,643 g/mol, and polydispersity index (PDI) = 3.1], low-MW PII-2T (Mn = 117,635 g/mol, Mw = 291,735 g/mol, and PDI = 2.4), and PTII-2T (the MW could not be measured because of its strong interaction with the column material even in high-temperature gas permeation chromatography measurement) were synthesized as previously described (40, 41). The DPP-based polymers such as DPP-BTz (Mn = 121,185 g/mol, Mw = 285,632 g/mol, and PDI = 2.3) and DPP2T-TT (Mn = 60,732 g/mol, Mw = 195,723 g/mol, and PDI = 3.2) were synthesized following a previously published procedure (22, 23). The solution was prepared by dissolving the polymer (1 to 30 mg/ml) in chloroform (99.8%; Sigma-Aldrich Inc.) or 1,2-dichlorobenzene (o-DCB; anhydrous, 99%; Sigma-Aldrich Inc.). A heavily doped n-type Si with a 300-nm-thick, thermally grown SiO2 layer was used as an oxide substrate. Corning glass substrates were used for spectroscopic studies. The substrates were cleaned with toluene, acetone, and isopropyl alcohol and then blow-dried with a stream of nitrogen to remove contaminants. The surfaces of all substrates were modified by a hydrophobic self-assembled monolayer (SAM) treatment. The SAM treatment was achieved by immersing the plasma-activated substrates in a dilute solution (0.1 volume %) of n-octyldecyltrichlorosilane (OTS; 95%; Acros) with trichloroethylene (anhydrous, >99.5%; Sigma-Aldrich Inc.) at room temperature for 20 min. The treated substrates were then rinsed with toluene, dried with nitrogen, and annealed at 120°C for 20 min.

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