Thin film organic solar cell as an emerging PV technique

Organic photovoltaic solar cells consist of organic semiconductors have attracted valuable importance in the areas of electronics and photonics during the last decade. Organic semiconductors are more flexible and less expensive substitute to inorganic semiconductors. By using simple and environmental friendly techniques, organic solar cells provide the possibility of fabricating large area, cost-effective, flexible, light-weight devices. An organic solar cell consists of an organic active layer which consider the basic steps in photovoltaic conversion such as light absorption, charge carrier generation, charge carrier transport and injection of charge carriers through the contact electrodes. Effect of Rs and Rsh in equivalent of circuit of photovoltaic diode discussed. P3HT:PCBM use as promising material for active layer. Stability and power conversion efficiency might be step-downs. By reducing these main challenges organic thin film solar cell can be part of solar cell market. Graphene sheet has great quality to replace indium tin oxide as cathode material. For simulation of bilayer organic solar cell determined that getting optimizing efficiency by maximizing values of exciton diffusion range, necessity of increase in electron hole mobility by applying horizontally external electric field, and lesser the donor accepter interface. Bulk heterojunction maximise the donor-acceptor contact area compare to bilayer heterojunction organic solar cell.