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Thermodynamic Model for Quantum Dot Assemblies Formed Because of Charge Transfer
ACS Omega ( IF 4.1 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acsomega.7b01486
Rekha Mahadevu 1 , Anshu Pandey 1
Affiliation  

Two initially neutral semiconductor quantum dots with appropriate band offsets can participate in a ground state charge transfer process. The charge transfer manifests itself in the form of bleaching of optical transitions and also causes the quantum dots to precipitate from solution, giving rise to assemblies with unusual properties. As this represents a postsynthetic modification of the electronic structure of quantum dots, it holds tremendous potential for improving the characteristics of quantum dot devices. Here, we study the dependencies of the properties of these assemblies on the structure of the participating quantum dots. In particular, we find that for assemblies formed out of Cu:CdS and ZnTe/CdS quantum dots, the composition of the assembly varies from 1:1.26 to 1:0.23 ZnTe/CdS to Cu:CdS as the shell thickness of CdS in ZnTe/CdS is increased. In contrast, the composition changes from 1:1.1 to 1:15 for PbSe/CdSe and Cu:CdS quantum dots, as the size of the PbSe core is increased. These observations are explained on the basis of a phenomenological thermodynamic model. The applicability of thermodynamics to this example of self-assembly is verified empirically.

中文翻译:

由于电荷转移而形成的量子点组件的热力学模型

具有适当的带偏移的两个初始中性半导体量子点可以参与基态电荷转移过程。电荷转移以光学跃迁的漂白形式表现出来,并且还导致量子点从溶液中沉淀出来,从而产生了具有异常性质的组件。由于这代表了量子点电子结构的后合成修饰,因此具有改善量子点器件特性的巨大潜力。在这里,我们研究了这些组件的性质对参与量子点结构的依赖性。特别是,我们发现对于由Cu:CdS和ZnTe / CdS量子点形成的组件,组件的组成从ZnTe / CdS到Cu:1:1.26到1:0.23不等:CdS随着ZnTe / CdS中CdS的壳厚度的增加而增加。相反,随着PbSe核尺寸的增加,PbSe / CdSe和Cu:CdS量子点的组成从1:1.1变为1:15。这些现象是基于现象学热力学模型进行解释的。实验证明了热力学在该自组装示例中的适用性。
更新日期:2018-01-10
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