A comparative study on the electrical parameters of organic photovoltaic device has been taken into consideration for unified realization about the need of carrier transportation layer in organic photovoltaic devices. The parameters have been measured by modeling the devices using simulation technique. Device efficiency of transportation layer P3HT:PCBM incorporated device has been obtained increasing comparatively. Possible reason of such improvement in device efficiency has been demonstrated on the basis of theoretical point of view. Series resistance and ideality factor has been estimated from IdV/dI-I plot. About three times reduction of the following has been encountered with addition of P3HT:PCBM compound. Such significant reduction of series resistance (Rs) and trap energy (Et) are found to be responsible for the probable reason of improvement of device efficiency which are calculated by analyzing Current-Voltage (I-V) characteristics. Differential technique of current voltage relationship has also been implemented to explain the trapping distribution for both devices. It has been found that trap factor increases for P3HT:PCBM compound device comparatively which concludes better conduction into the device.
 
