Transient and steady state lateral charge transport in polymeric semiconductors

This paper presents a discrete circuit model with spreading impedance approach for investigation of charge carrier dynamics in polymeric photovoltaic devices covering temperature dependence, frequency response, wavelength dependence and transient response of the devices. The model has been employed on a position sensing device. In an earlier work, this model has been found in good agreement with the experimental results within the consideration of steady state nature of the charge carriers. Now the model has been extended by incorporating the transient nature of the charge flow produced by majority charge carriers generated in the illuminated region considering Gaussian distribution for intensity of laser beam in the illuminated region unlike the previous model where it was assumed to be uniform.