Ali Mahmoudloo - Department of Basic Science, Farhangian University, Tehran. Iran

Organic semiconducting polymers are for use inlow cost electronics and photovoltaic application hastechnological and scientific interest in organic materials. Inthis paper we use the time of flight of a charge packetinjected by a voltage pulse to calculate the drift velocityand mobility of holes. This technique is based on theapplication of a voltage applied at the anode andcalculating the delay time in the appearance of the injectedcarriers at the other contact. This method is a simple wayto determine the charge transport properties of the organicsemiconductors .The effect of charge trapping mechanismon the carrier mobility in the organic layers are investigatedand we discussed the theory of a electronic method toobtain the drift mobility of holes in an organic layer.Finally time of flight calculations were done on organiclayers and it was observed that the mobility reduces at lowelectric field.

organic semiconductors, charge transport, mobility, time of flight