CAREER: Minority Carrier Transport in Wide Bandgap Semiconductor Nanowires: Classical and Quantum Size Effects

职业：宽带隙半导体纳米线中的少数载流子传输：经典和量子尺寸效应

• 批准号: 0845007
• 负责人: Yi Gu
• 金额: $ 56.93万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-02-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0845007&HistoricalAwards=false
• 关键词: CAREER; Minority; Carrier; Transport; Wide

Technical: This project is to study minority carrier transport properties in nanowires made of wide-bandgap semiconductors. Minority carrier transport is of special interest and importance, as it controls majority carrier transport in many devices and is also sensitive to carrier-carrier interactions. In this project, free-standing wide-bandgap semiconductor nanowires with controlled dimensions are synthesized using the vapor-liquid-solid growth method. One-dimensional minority carrier transport, specifically the surface-dependent and -independent minority carrier diffusion lengths and drift mobilities, is studied using novel scanning probe microscopy-based techniques with integrated electrical and optical probing capabilities. The classical size effects are investigated via the correlation between surface electronic structures under various surface conditions and effects of surfaces as minority carrier recombination and scattering centers. The quantum size effects are examined via the size (diameter) dependence of the minority carrier mobility controlled by various transport-limiting mechanisms including carrier-impurity, carrier-phonon, and carrier-carrier (minority-majority) scattering processes.Non-technical: The project addresses basic research issues in a topical area of materials science with high technological relevance. With the importance of carrier transport in wide-ranging electronic and optoelectronic applications, the success of this project will provide a fundamental basis for the potentially transformative nanoscale materials and device engineering efforts. This project will lay the foundation for future efforts by the PI to develop the approach of tuning the interplay among electrons, phonons, photons, impurities, and surfaces via dimension, surface, and impurity engineering in order to achieve an integrated control over optical, electrical, magnetic, and thermoelectric properties in nanoscale materials. The research component of this project is integrated into multifaceted educational and outreach activities. In addition to providing research training for students at both undergraduate and graduate levels, the educational efforts aim to enhance general undergraduate physics education for students with diverse backgrounds, as well as to provide a "focused concept" laboratory experience for undergraduate physics majors at the Washington State University. The outreach element of this project aims to provide continuing, long-term support for science teacher education and professional development.

技术：该项目是研究由宽带半导体制成的纳米线中的少数族裔运输特性。少数族裔运输具有特殊的关注和重要性，因为它控制着许多设备中的多数载流子运输，并且对载流子交互也很敏感。在这个项目中，使用蒸气 - 液体 - 固定生长法合成了独立的宽带半导体纳米线。一维少数载体运输，特别是表面依赖性和独立的少数载体扩散长度和漂移迁移率，使用具有集成的电气和光学探测能力的新型扫描探针显微镜技术研究。经典的尺寸效应是通过在各种表面条件下的表面电子结构之间的相关性和表面的影响作为少数载体重组和散射中心进行的。通过各种运输限制机制控制的少数族裔运营能力的尺寸（直径）依赖性检查量子尺寸的效果，包括载体障碍，载波，载波和载体 - 载流子（少数族裔 - 占人群）散射过程。随着载体运输在广泛的电子和光电应用中的重要性，该项目的成功将为潜在的变革性纳米级材料和设备工程工作提供基本的基础。该项目将为PI的未来努力奠定基础，以开发通过尺寸，表面和杂质工程来调整电子，声子，光子，杂质和表面之间的相互作用的方法，以实现对纳米级材料中光学，电气，电气，磁性和热电性能的综合控制。该项目的研究组成部分被整合到多方面的教育和外展活动中。除了为本科和研究生一级的学生提供研究培训外，教育努力旨在增强背景不同的学生的一般本科物理教育，并为华盛顿州立大学的本科物理专业提供“专注的概念”实验室经验。该项目的外展元素旨在为科学教师教育和专业发展提供持续的长期支持。