Modeling Of The J-V Characteristics For Ito/Cupc/C-60/Al Hetero-Structure Solar Cells

The characteristics of current density (J) versus bias voltage (V) for various organic photovoltaic cells (OPVCs) with a basic hetero-structure of ITO/CuPc/C-60/Al are measured and analyzed by an equivalent circuit model. Two modeling schemes are developed and analyzed. The first one involves the direct fit of the J-V data to the equation governed by the equivalent circuit. But for some of the J-V data, the direct-fit scheme occasionally leads to unrealistic fitting values. To maximize the usefulness of the equivalent circuit, a second modified scheme is then proposed and justified. Finally, together with experimental J-V data and numerical fitting results, effects from the adding of C-60 hetero-junction layer and from the changing of substrate temperature during the deposition of CuPc layer are discussed for various OPVCs.