| 초록 |
The device performance of organic photovoltaics is influenced much by the molecular and mesoscale structures of organic semiconductor films that determine their exciton generation and charge transport characteristics. Here, several approaches for controlling interfaces and structures of semiconductor films are discussed. First, we controlled work function and surface energy of ITO electrode for HOMO level matching between electrode and active layer, and phase separation of active layer. Second, by using a template, we fabricated poly (3-hexylthiophene) nano rod / C60 bilayer device. Increasing interfacial contact area between donor and acceptor caused the enhanced device performance. Third, by using chemically modified P3HT, we controlled the miscibility between P3HT and PCBM, and domain size of each material. By optimizing the phase separation and morphology of active layer, we can achieve the efficiency, ~5.3% with fill factor 0.68. |
