| 초록 |
The interface between photo-active layer and charge extraction layer is critically important for a better design of the polymer-fullerene solar cell with improved power conversion efficiency and device stability. Significant progress has been made in the performance of organic bulk heterojunction solar cells through the development of active layer materials, while detailed experimental studies on how to minimize interfacial charge collection losses are not systematically performed yet. Comparing the devices with thin layer of PEDOT:PSS and semiconducting p-type oxide inserted between the active organic layer (poly(3-hexyl-thiophene):1-(3-methoxy-carbonyl)propyl-1-phenyl-(6,6)C61 - P3HT:PCBM) and anode, 3.6% and 3.4% of power conversion efficiency was obtained, respectively. Charge collection at interface were explained by the work function, conductivity behavior, and interfacial composition. In this presentation, experimental results on the device architecture and interfacial analysis are discussed in detail, both for normal and inverted bulk-heterijunction cells. |
