声子散射下半导体核壳结构纳米线中的电子输运

项目名称： 声子散射下半导体核壳结构纳米线中的电子输运

项目编号： No.11304142

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 屈媛

作者单位： 内蒙古大学

项目金额： 25万元

中文摘要： 本项目拟从雷丁平衡方程方法出发，从理论上探讨声子散射机制影响下的半导体（特别是氮化物）核壳结构纳米线（CSNW）中载流子的输运性质. 考虑纳米线异质结构中，因界面附近晶格失配导致的应变对各层材料的能带、电子有效质量、介电函数以及晶格振动等物理参数的影响，首先建立简单模型，然后改进模型计入更多真实生长CSNW中的因素. 采用哈密顿方程和泊松方程自洽求解CSNW纳米线中的电子能级和分布. 在介电连续模型的框架内探讨CSNW中的晶格振动，并进一步获得电声子相互作用哈密顿量. 依据雷丁平衡方程方法，计算各类声子散射下CSNW中的电子沿纳米线轴向和径向的迁移率随体系界面应变、组分、尺寸的变化关系. 从而了解CSNW的电导和发光性质. 以期解释和预言CSNW中的光电性能，推动相关领域的实验和理论发展，指导CSNW体系的功能探索和设计.

中文关键词： 核壳结构；纳米线；电子；声子；输运

英文摘要： Based on the force balance equation of Lei and Ding，this proposal aims theoretical investigation of transport properties of current carrier in semiconductor core-shell nanowires. Considering affection of strain due to mismatch of lattices adjacent to the interface on the energy band, effective mass of electron, dielectric function, lattice vibration eta physical parameter, a simple model is set up firstly, and better models taking more factors in real grown CSNW into account are proposed. By solving the Hamilton equation and Poisson equation self-consistently, the Eigen energies and distribution of electron in CSNW are studied. In the framework of the dielectric continuum model, lattice vibration are discussed; furthermore, the Hamiltonians of electron-phonon interactions are obtained. According to the force balance equation of Lei and Ding, the functions of electron mobility along and perpendicular axis of NW scattered by phonons varying with strain on the interface, composition, and scale of the system is calculated. And then the conductivity property of CSNW is indicated. It is expected to explain and predict the photoelectric properties of CSNW, to stimulate the development of experiments and theories in the related field, so as to provide guidance for exploring and design new functional structures of CSNW.

英文关键词： Core-shell；nanowire；electron；phonons；transport