Table 2. Optical and Energetic Properties of the Neutral Polymers.

polymer	λmax (nm)		cEoptg (eV)	dDR [rubbing temperature] (°C)]	eE(ox)onset vs Fc/Fc+ (V)	fΦwf (eV)
	solutiona	thin filmb
P3HT	455	561	1.91	16 [220]	0.05	4.65
Tref	456	560	1.91	10 [180]	0.06	4.67
T19	469	550	1.94	6 [150]	0.03	4.71
T24	471	549	1.95	3 [80]	0.03	4.70

^aMeasured by UV–vis absorbance spectroscopy from 0.01 mg mL^–1 polymer solutions in chlorobenzene set at 30 °C using a Peltier cooler.

^bMeasured by UV–vis absorbance spectroscopy from thin films spun from 10 mg mL^–1 ODCB solutions at 80 °C at 2000 rpm for 90 s onto glass slides.

^cEstimated from the optical onset of absorbance. Energy (eV) = 1240 (eV nm)/λ (nm).

^dDichroic ratio was calculated using DR = A_∥/A_⊥.

^eMeasured by cyclic voltammetry from the onset of oxidation of polymer thin films drop-cast onto a glassy carbon electrode from 1 mg mL^–1 chloroform solutions in acetonitrile with 0.1 M tetrabutylammonium hexafluorophosphate as the supporting electrolyte. A platinum wire, carbon electrode, and Ag/Ag⁺ electrode were used as the counter, working, and reference electrodes, respectively. Fc/Fc⁺ = Ag/Ag⁺ – 0.115 V.

^fWork function measured using PESA on two polymer thin films doctor-bladed onto ITO-coated glass from 10 mg mL^–1 solutions in chlorobenzene.