Isothermal transient current studies in cellulose acetate films

Step voltage transient current studies have been made in cellulose acetate films as a function of filed and thickness. A logarithmic plot (Scherr‐Montroll plot) of the transient current vs. time gives a knee at a time t T , which is interpreted as the transit time of the charge carrier. The value of the carrier mobility has been estimated to be 3.9 × 10 −9 cm 2 .V −1 .S −1 in cellulose acetate film. The carrier mobility in iodine‐doped (2% w/w) cellulose acetate film has also been determined from Scher‐Montroll plot and is found to be 3.3 × 10 −7 cm 2 .V −1 .S −1 .