半导体量子点-二维碳氮纳米结构电子输运理论研究

项目名称： 半导体量子点-二维碳氮纳米结构电子输运理论研究

项目编号： No.11204262

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 魏晓林

作者单位： 湘潭大学

项目金额： 25万元

中文摘要： 二维碳氮纳米结构可通过调整碳氮原子比例及分布实现能带与电子结构调控，将给半导体量子点器件化应用提供良好的载体。然而，目前尚无半导体量子点-二维碳氮纳米结构理论与实验相关研究。本项目拟采用第一性原理计算、分子动力学及电子输运理论方法，首先系统研究二维碳氮纳米结构中原子比例及分布对其电子结构和输运特性的影响；以典型单元素半导体Si量子点及化合物半导体CdS量子点为例，研究半导体量子点-二维碳氮纳米结构形成的动力学过程、接触效应及作用机制。在此基础上,分别选用金属性和半导体性二维碳氮纳米结构作为载体，研究量子点的大小、形状、位置分布及掺杂对其电子输运行为的影响。通过系统研究，探索半导体量子点与二维碳氮纳米结构电子输运的耦合与调制规律，建立起能应用于半导体量子点-二维碳氮纳米结构器件设计的电学预测模型。本项目的完成将为设计和发展新型量子点器件提供理论基础与实验指导。

中文关键词： 量子点；二维纳米结构；电子性质；；

英文摘要： The energy bands and electronic structures of two-dimensional carbon-nitrogen nanostructures can be modulated by adjusting the proportion and distribution of nitrogen atoms in nitrogen-hybrid graphene, which has potential to be a good carrier for the applications of semiconductor quantum dot device. Few theoretical and experimental researches on the hybrid structure of semiconductor quantum dots and two-dimensional carbon-nitrogen nanostructures have been carried out. Taking first-principles, molecular dynamics and electronic transport theory method,the effect of atom proportion and distribution in the two-dimensional carbon-nitrogen nanostructures on the electronic structure and transport properties will be firstly discussed. The single-element semiconductor quantum dots Si and compound semiconductor quantum dot CdS will be taken to study the dynamic process, contact effects and mechanism of the hybrid structures. Based on these results, the effects of quantum dots size, shape and location distribution on the electronic transport are further discussed. Through the systematic studies, the coupling rule between the semiconductor quantum dots and the two-dimensional carbon-nitrogen nanostructures will be explored, aiming to establish the application model for semiconductor quantum dots and two-dimensional carbon-

英文关键词： quantum dots；two-dimensional nanostructures；electron properties；；