| 초록 |
The efficiency of organic photovoltaic cells has greatly improved since the bulk-heterojunction (BHJ) concept was introduced. Although it is well understood that the nano-scaled morphology of active layer is critical for determining the efficiency of organic solar cells, the effect of the variation in morphology upon the local mobility of charge carriers and the performance of solar cell has largely been unknown, because the morphological structure can not be clearly identified in experiment. Hence, computer simulation could be a powerful method to provide important information for the relationship between mobility and morphology. In this study, we use a Monte Carlo model to reveal the dependence of mobility upon the morphology. As the domain size, the blend composition and the uniformity of blend morphology across the active layer are systematically varied, the performance of photovoltaic device is investigated by using the drift-diffusion model. |
