Radiation-induced conductivity in polymers under pulsed and long-time small-signal irradiations combined to determine their step-function response
We have investigated radiation-induced conductivity (RIC) in several low mobility common polymers as well as two with excellent charge transport characteristics. Irradiations were pulsed and continuous with constant dose rates from microseconds to seconds. Experiments were done in the small-signal mode at a relatively high electric field. To interpret the results, we performed numerical calculations based on the conventional as well as the modified Rose-Fowler-Vaisberg (RFV) models. Also, to accommodate the time-of-flight and deep trapping effects, we used an analytic formula describing strongly nonequilibrium dispersive transport at high electric fields in the presence of deep
trapping. As a result, several long-standing RIC issues have been resolved. A crucial role of pulsed irradiations for polymer parameterization in terms of the RFV model has been demonstrated.