| 초록 |
Bulk heterojunction organic photovoltaic cells are the promising alternative for conventional silicon-based solar cells. Despite growing research efforts, the fundamental processes governing the operation of organic solar cells are still poorly understood. A better understanding would guide improvements in device design and performance. In this study, a two dimensional device model was built to describe the current-voltage characteristics of bulk heterojunction solar cells and also to consider the optical interference effects between layers of organic solar cells. The steady-state behavior of electron, hole and exciton concentrations is captured by the drift-diffusion model, where the light intensity calculated from the optical transfer matrix theory is used as the input for optical carrier generation. In this manner, we can correlate the device performance to the internal structure of device and also predict how the morphology of active layer is tailored to meet photovoltaic needs. |
