Table 1 Polymer ionization energies, electron affinities, and optical properties.

PolymersEopt.gap (eV)*IE (eV)EA (eV)
NN11.01−5.20−4.19
NN21.04−5.16−4.12
AN1-−5.39-
AN21.03−5.13−4.10

*Estimated optical gap was calculated using onset of the thin-film (spin-coated on glass substrates) absorption spectra (Eopt = 1240/λonset).

†Measured by the Photoelectron Spectroscopy in Air (PESA) system.

‡EA is calculated from EA = IE − Eopt.