Measurements of deviation from Einstein relation in PVK-based photorefractive polymers by photoelectromotive-force technique

Non-steady-state photoelectromotive-force effect is proposed for experimental measurements of deviation from Einstein relation in amorphous monopolar photoconductors. For widely used poly(N-vinylcarbazole)-based polymer films this technique yielded an approximately three-fold difference between the measured diffusion coefficient-to-mobility ratio (D/mu) and its conventional value in crystalline photoconductors (approximate to78 vs 25 mV). The mobility, lifetime, and diffusion coefficient of the photoholes were evaluated in these experiments as approximate to7.9x10(-8) cm(2)/Vs, approximate to10 ms, and approximate to5.6x10(-9) cm(2)/s, respectively.