Abstract

Determination of regular features of mechanisms underlying interactions of nanostructured materials is one of the most important problems on the way to create the new generation of efficient photovoltaic devices. In this paper, we study the luminescent and photoelectric properties of hybrid structures that are formed on the basis of multilayer graphene nanoribbons and semiconductor quantum nanocrystals of the 0D dimension, CdSe/ZnS core/shell quantum dots, and 2D-dimension CdSe nanoplates. It is shown that the multiexponential decay of the exciton luminescence of CdSe nanoplates at room temperature is determined by the occurrence of delayed luminescence, which is caused by the presence of trap states on the surface of nanoplates. It is found that, in dry layers of nanoplates on a dielectric substrate and in the composition of hybrid structures with graphene nanoribbons, the efficiency of delayed exciton luminescence of nanoplates increases. It is shown that the rate of increase in the photoconductivity in hybrid structures based on CdSe nanoplates is an order of magnitude higher than the rate of this process in similar structures based on CdSe/ZnS quantum dots, which indicates the formation of an effective energy/charge transfer channel from nanoplates to graphene nanoribbons.

中文翻译：

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基于多层石墨烯和0D和2D半导体量子纳米晶体的杂化结构的发光和光电特性

摘要

确定纳米结构材料相互作用基础的机理的常规特征是创建新一代高效光伏器件的最重要问题之一。在本文中，我们研究了基于多层石墨烯纳米带和0D尺寸的半导体量子纳米晶体，CdSe / ZnS核/壳量子点和二维CdSe纳米板形成的杂化结构的发光和光电性能。结果表明，CdSe纳米板在室温下激子发光的多指数衰减是由延迟发光的发生决定的，这是由于纳米板表面存在陷阱态而引起的。发现，在介电基底上的纳米板的干燥层中以及在具有石墨烯纳米带的杂化结构的组成中，纳米板的延迟激子发光的效率增加。结果表明，基于CdSe纳米板的混合结构中光电导率的增加速率比基于CdSe / ZnS量子点的相似结构中该过程的速率高一个数量级，这表明有效能量/从纳米板到石墨烯纳米带的电荷转移通道。