Large-Area Synthesis and Carrier Transport and Dynamical Properties of Atomically Thin Two-Dimensional In2Se3

原子薄二维In2Se3的大面积合成、载流子输运及动力学性质

• 批准号: 1506480
• 负责人: Yi Gu
• 金额: $ 37.63万
• 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: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1506480&HistoricalAwards=false
• 关键词: Large; Area; Synthesis; Carrier; Transport

Nontechnical Description: The behavior of electrons in a solid material is central to electrical and optical characteristics of the material and plays a critical role in determining the performance of electronic and optoelectronic devices such as transistors, photodetectors, and solar cells. Recently, two-dimensional materials, with the thickness down to a single atomic layer, have emerged as a new class of material systems with novel properties beyond conventional bulk materials. This project studies the charge carrier transport and dynamics in a technologically important two-dimensional material, indium selenide, and develops a fundamental understanding of the synthesis-structure-property relation. The research is integrated into education and outreach activities. In addition to providing research opportunities for undergraduate and graduate students, including those from the underrepresented groups in science and engineering, the research results generated in this project are incorporated into the classroom teaching and hands-on experience with optics, electric circuits, and photovoltaics is offered to high school students through a summer workshop.Technical Description: This research project aims to establish a fundamental understanding of charge carrier transport and ultrafast carrier dynamics in two-dimensional indium selenide. This project involves patterned synthesis of atomically thin single-crystal indium selenide over a large area using van der Waals epitaxy, and property characterizations utilizing a combination of transmission electron microscopy, confocal Raman spectroscopy, scanning probe microscopy, and spatially resolved ultrafast optical pump-probe techniques. This project addresses important issues in this material, particularly the transport properties and dynamics of both majority and minority charge carriers, and the correlation among the properties, structures, and material synthesis. The understanding of this synthesis-structure-property relation provides a fundamental materials science basis for innovative optoelectronic applications.

非技术描述：固体材料中电子的行为对于材料的电气和光学特性至关重要，并且在确定电子和光电设备的性能中起着至关重要的作用。最近，二维材料（厚度降低到单个原子层）已成为一类新的材料系统，其新型特性以外的传统散装材料。该项目研究了在技术上重要的二维材料中的电荷载体传输和动力学，并对合成结构 - 培训关系的基本理解产生了基本的理解。该研究纳入教育和外展活动。除了为本科生和研究生提供研究机会，包括科学和工程领域代表性不足的小组的研究机会外，该项目中产生的研究结果还包括在课堂教学中，并具有光学，电路，电动电路和光伏的动手体验，并通过夏季校正式的运输方式向高中生提供了一项研究，从而建立了基本的研究目标：二维硒化。该项目涉及使用范德华同截图在大面积上的原子稀薄的单晶依岩的图案合成，并使用透射电子显微镜，共聚焦拉曼光谱，扫描探针显微镜以及空间分辨的超拟合超级泵送光泵孔技术的结合进行了特性表征。该项目解决了该材料中的重要问题，尤其是多数和少数携带者的运输特性和动态，以及属性，结构和材料合成之间的相关性。对这种综合结构 - 特制关系的理解为创新的光电应用提供了基本的材料科学基础。