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The physics of organic bulk heterojunction solar cells is studied within asix state model, which is used to analyze the factors that affectcurrent-voltage characteristics, power-voltage properties and efficiency, andtheir dependence on nonradiative losses, reorganization of the nuclearenvironment, and environmental polarization. Both environmental reorganizationand polarity is explicitly taken into account by incorporating Marcusheterogeneous and homogeneous electron transfer rates. The environmentalpolarity is found to have a nonnegligible influence both on the stationarycurrent and on the overall solar cell performance. For our organic bulkheterojunction solar cell operating under steady-state open circuit condition,we also find that the open circuit voltage logarithmically decreases withincreasing nonradiative electron-hole recombination processes.

Multiple State Representation Scheme for Organic Bulk Heterojunction Solar Cells: A Novel Analysis Perspective