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As worldwide energy demand increases, conventional sources of energy, fossils fuels such as coal, petroleum and natural gas will be exhausted in the near future. Therefore, renewable resources will have to play a significant role in the world’s future supply. Solar energy occupies one of the most important places among these various possible alternative energy sources. The direct photovoltaic conversion of sunlight into electricity seems to be extremely promising. Solar cells furnish the most important long-duration power supply for satellites and space vehicles. They have also been successfully employed in terrestrial application. A solar cell (also called photovoltaic cell or photoelectric cell) is a solid state device that converts the energy of sunlight directly into electricity by the photovoltaic effect. Assemblies of cells are used to make solar modules, also known as solar panels. The energy generated from these solar modules, referred to as solar power, is an example of solar energy. photovoltaic system uses various materials and technologies such as crystalline Silicon (c-Si), Cadmium telluride (CdTe), Gallium arsenide (GaAs), chalcopyrite films of Copper-Indium-Selenide (CuInSe2) and Organic materials are attractive because of their light eight, processability, and the ease of designing the materials on the molecular level. Solar cells are usually assessed by measuring the current voltage characteristics of the device under standard condition of illumination and then extracting a set of parameters from the data. The major parameters are usually the diode saturation current, the series resistance, the ideality factor, the photocurrent and the shunt conduction. The extraction and interpretation has a variety of important application. These parameters can, for instance, be used for quality control during production or to provide insights into the operation of the devices, thereby leading to improvements in devices.

A New Model for Extracting the Physical Parameters from I-V Curves of Organic and Inorganic Solar Cells