Electron drift mobility in polystyrene doped with bispyrazolopyridine derivatives

Electron transport properties of bispyrazolopyridine derivatives have been studied using a conventional time-of-flight method. A field dependent electron drift mobility, in the range of 4×10−7–2×10−5 cm2/(V s) at an electric field of (0.6–7.0)×105 V/cm, has been found from the bispyrazolopyridine doped polystyrene specimen. The correlation between chemical structure and measured mobility is found to fit the correlated disorder model reasonably well when the charge transport is represented in terms of the one-electron transfer between frontier molecular orbitals. Optimization of molecule configuration and calculation of the orbital energy and wave-function decay constant have been computed by the semiempirical PM3 and AM1 methods.