Tailoring Chemical and Morphological Properties of Graphene Oxide via γ-ray Irradiation for Enhanced Efficiency of Perovskite Solar Cells
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초록
내용
In this study, we demonstrate that surface chemistry of graphene oxide (GO) is effectively tailored by γ-ray irradiation, and the tailored properties of GO can contribute to the enhancement of the performance of perovskite solar cells. Aqueous GO was exposed to high energy 60Co γ-ray, which resulted in oxidation of GO: The reaction induced by γ-ray irradiation increased the oxygen content of the GO and scattered large GO agglomerates into GO sheets with small lateral dimensions, which leads to uniform distribution in PEDOT:PSS layer. In addition, PEDOT:PSS layer with γ-GO exhibited higher hydrophobicity than the pristine PEDOT:PSS layer, which facilitated the uniform grain growth of perovskite. As a result, GO with tailored chemical and morphological properties significantly improved the hole transport properties in perovskite solar cells.