Abstract
Absorption spectra of V 2O 5 layers deposited from gels of various V 4+ contents C were studied from near UV down to near IR. The high absorption region due to the charge transfer transition extends above ≈ 2 eV. Whatever C the optical gap is ≈ 2.25 eV. On the low energy side an Urbach tail is observed whose slope increases with C. In the near infrared absorption is related to the V 4+ ions and increases linearly with C. The absorption band due to the optically induced polaron hopping is detected. The corresponding maximum E max suffers a red shift when C increases. The experimental E max data are very close to the values predicted from the polaron and disorder energies as deduced from the conductivity study in an earlier paper. The slight difference between the two sets of data allowed us to estimate the transfer integral J ≈ 0.015 eV.
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