Electrical simulation of organic solar cell based on CuPc/C60 heterojunctions

Organic photovoltaic (PV) devices have opened up a new route for renewable source of electrical energy because of their advantages such as low cost of fabrication and easy processing on flexible substrate. Since Tang in 1986 [1] proposed a two layers organic PV device containing donor and acceptor (D/A) heterojunction to increase power conversion efficiency, significant effort has been made to improve the device performance. The basic equations of an organic solar cell are described in this paper. The dark and illuminated I (V) characteristics are analytically described and PSpice models are introduced firstly the simplest model, composed of a diode, two resistances and a current source. The fundamental electrical parameters of the organic solar cell are defined: short circuit current (Isc), open circuit voltage (Voc), maximum power (Pmax) and fill factor (FF). This model is studied for different ideality factors under different irradiations. The aim of our work is to identify the key parameters of the model to optimize the thick of the different films witch compose the organic polymer solar cell.