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A highly robust and stable graphene-encapsulated Cu-grid hybrid transparent electrode demonstrating superior performance in organic solar cells
- Jeong, Gyujeong, Jung, Seungon, Choi, Yunseong, Lee, Junghyun, Seo, Jihyung, Kim, Dong Suk, Park, Hyesung
- Journal of materials chemistry A 2018 v.6 no.48 pp. 24805-24813
- copper, electrical conductivity, electrodes, graphene, oxidation, solar cells, solar energy
- Copper is one of the candidate materials for alternative transparent conductive electrodes (TCEs) owing to its excellent electrical conductivity and low cost. The vulnerability of copper against oxidation, however, imposes a severe limitation on its widespread application in functional devices. In this study, we demonstrate a high-performance and robust Cu and graphene hybrid TCE, where Cu optimized in a grid structure was used as the base electrode, while graphene sheet provided additional charge collection and transport pathways as well as a protective layer against oxidation of the underlying Cu. The Cu grid/graphene hybrid TCE was demonstrated in organic solar cells (OSCs) to have a power conversion efficiency of 8.5%, which is among the best performances based on metal grid TCE-based OSCs. The resulting device exhibited excellent long-term and thermal stabilities as well. The proposed Cu grid/graphene hybrid structure is expected to find practical application in various optoelectronics devices.