AbstractThe results of investigating charge-transfer processes in thin layers of a vitreous system (As_2Se_3)_100 – _ x Bi_ x are presented. A power-law dependence of the conductivity on the frequency and a decrease in the exponent s with increasing temperature are found. Charge transfer is a thermally activated process with two regions in the temperature dependence of the conductivity with the activation energies E _1 = 0.12 ± 0.01 eV and E _2 = 0.23 ± 0.01 eV, respectively. The results are explained in terms of the correlated barrier hopping (CBH) model of hopping conductivity in disordered systems. The main microparameters of the system are calculated: the density of localized states ( N ), the hopping length ( R _ω), and the largest height of the potential barrier ( W _ M ).
Absorption Tails of Donor:C60 Blends Provide Insight into Thermally Activated Charge-Transfer Processes and Polaron Relaxation
