Charge carrier transport in phenylated poly(naphthoylenebenzimidazole)
A. P. Tyutnev, M. L. Keshtov, J. Kundin, V. S. Saenko, E. D. Pozhidaev.
Polymer Science Series B, 43, 219-222, (2001)
Charge carrier transport in pure and phenylated poly(naphthoylenebenzimidazole) was compared by measurements of transient radiation-induced conductivity. Irradiation with single 100-μs pulses of 55-keV electrons was carried out in vacuum at room temperature. Contrary to expectations, the phenylation deteriorated the transport properties of a polymer: the delayed radiation-induced conductivity in phenylated poly(naphthoylenebenzimidazole) was almost 50 times lower than in the initial polymer, with the dispersion parameter decreasing from 0.4-0.25 to ≤0.05. As a result, the drift mobility of charge carriers falls by a few orders of magnitude. The mechanism of such behavior still remains unclear.