| 초록 |
ZnO is commonly used as buffer layer material in inverted organic solar cells (IOSCs) for electron extraction, because of its environmental stability, high electron mobility and optical transparency. However, the surface of ZnO has high surface energy, and that makes poor interfacial contact with the hydrophobic organic photoactive layer, resulting in charge trapping in an interface. For improving electron extraction in IOSCs, modification of the interface between the electrode and the organic photoactive layer is regarded as important issue. In this study, we modified ZnO electron extraction layer (EEL) with conjugated polymer electrolyte (CPE) for lowering surface energy.By introducing CPE material, the surface of CPE-ZnO layer showed lower surface energy than that of ZnO layer. We fabricated IOSCs using the CPE-ZnO as a cathode modifier. As a result, the PCE of devices with CPE-ZnO was as high as 9.2%, and the long-term stability was improved compared with a ZnO-based device. |
