Data of the initial period of operation of polymer/TiO2 composite solar cells (CSC) in a non-steady state regime was investigated. The transient behavior is accounted for using an equivalent circuit model (ECM) of the photovoltaic device with time-dependent resistors. It was found that the kinetics and the magnitude of the changes in the device parameters were affected by the materials employed in the bi-layer cells as well as by the spectral range and the intensity of the incident light. It ...