ORGAINC SOLAR CELLS (OSCs) is recently received a great  urge as it is safe, secure and clean substitute for the current fossil fuel power plants and it  can be synthesized by low temperature processes at low cost price with a good energy balance. During the preceding years, OSCs  performance has enhanced remarkably but needs more improvements also. Simulations Or modelling are impressive tools for optimization of OSCs, disclose the new perception and predict the behavior, performance, limitations, stability, dependency of OSCs and maximum possible efficiency. In this paper we tells about the some various types of organic solar cells. In this research paper, we discuss about the chain of simulation models  for modeling state of the art devices, their corresponding advancement in recent years on the basis of device physics and examine the photo absorption, working, principle, their quantum efficiency, short circuit current, open circuit voltage and fill-factor of the device to considered the photovoltaic needs.

KEYWORDS: Organic Solar Cells, Small Molecules based Solar Cells, Drift Diffusion Model.