Organic solar cells (OSCs) has recently received a great impulse as it is safe & clean substitute for the existing fossil fuel power plants, can be manufactured by low temperature processes at low-cost with a promising energy balance. During the past years OSCs performance has improved significantly but needs further improvements. Simulations/modelling are powerful tools for optimization of OSCs, reveal new insights, and predict the behaviour, performance, limitations, stability, dependency of OSCs & maximum attainable efficiency. In this paper we review a chain of simulation models (optical/electrical) for modelling state of the art devices, corresponding development in recent years on the basis of device physics and working principle, analyzing photo-absorption, quantum efficiency, short-circuit current, open-circuit voltage and fill-factor of the device to meet photovoltaic needs.
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