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Three-dimensional graphene networks and reduced graphene oxide nanosheets co-modified dye-sensitized solar cells

机译：三维石墨烯网络和还原石墨烯氧化物纳米片共改性的染料敏化太阳能电池

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摘要

Graphene assisted dye-sensitized solar cells (DSSCs) have drawn increasing attention because of their high performances. However, two bottlenecks (the high defect density and the discontinuous structure) of the widely adopted reduced graphene oxide (RGO) nanosheets bring about that the practical photovoltaic properties are far inferior to the theoretical prediction values. Therefore, three-dimensional graphene networks (3DGNs) of high quality have been employed to modify DSSCs to avoid the above mentioned problems. However, a close contact between the graphene basal plane and TiO2 particles in the resulting photoanode is difficult to achieve due to the absence of surface functional groups of the 3DNG. In this study, the RGO nanosheets and 3DGNs co-modified DSSCs are prepared, and the advantages from these two modifiers can give full play to their synergy. The added RGO nanosheets enhance the electron transport ability at the interfaces between graphene, TiO2 and conductive substrate. After optimizing the reduction degree and mass fraction of the RGO nanosheets, the power conversion efficiency of the resulting DSSC reaches 7.68%, which is much higher than those cases of using the 3DGNs (or RGO nanosheets) as modifier alone.
机译：石墨烯辅助的染料敏化太阳能电池（DSSC）由于其高性能而受到越来越多的关注。然而，广泛采用的还原氧化石墨烯（RGO）纳米片存在两个瓶颈（高缺陷密度和不连续结构），导致实际的光伏性能远远低于理论预测值。因此，已采用高质量的三维石墨烯网络（3DGN）来修改DSSC，以避免上述问题。然而，由于缺少3DNG的表面官能团，因此难以实现石墨烯基面与所得光阳极中的TiO 2 颗粒之间的紧密接触。在这项研究中，制备了RGO纳米片和3DGNs共修饰的DSSC，这两种修饰剂的优势可以充分发挥其协同作用。添加的RGO纳米片增强了石墨烯，TiO 2 与导电基底之间界面的电子传输能力。优化RGO纳米片的还原度和质量分数后，所得DSSC的功率转换效率达到7.68％，这比单独使用3DGNs（或RGO纳米片）作为改性剂的情况要高得多。

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