PHOTOGENERATION AND TRANSPORT OF CHARGE-CARRIERS IN POLY(HYDROXYAMINO ESTERS)

The mechanism of photogeneration and hole transport in poly(hydroxyamino esters) (PHA) has been investigated by electrophotographic and time-of-flight methods. The spectral and electric field dependencies of photogeneration efficiency of holes in PHA films without and with addition of CBr4 has been studied. Under the UV photolysis of PHA films containing CBr4, the polycation product, acting as an effective sensitizer, is formed. The field dependencies of photogeneration efficiency are interpreted within the framework of the Onsager model. Superlinear thickness dependence of hole transit time fits well with dispersive non-Gaussian transport. The hole drift mobility and activation energy are equal to 2 x 10(-10) m2/V.s and 0.25 eV at electric field 8 x 10(7) V/m.