Bandgap and wavefunction engineering of semiconductor heterostructures

半导体异质结构的带隙和波函数工程

• 批准号: 9387-2006
• 负责人: Masut, Remo
• 金额: $ 4.3万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=363160
• 关键词: Bandgap; wavefunction; engineering; semiconductor; heterostructures

Materials such as magnetic semiconductor (MS) alloys, and quantum heterostructures (QHS) such as embedded quantum dots (QDs) play an important role in spintronic and photonic applications, and  are becoming essential for technological innovation. My proposal will focus on (1) the epitaxial growth of QHS and MS alloys and (2) their characterization and application in discrete devices. We will continue our ongoing study of strained III-V compound QHS, which includes stacks of multiple layers of coherent QDs, for optoelectronic device applications such as infrared photodetectors. Our research has a strong experimental component which is usually complemented by theoretical analysis and modeling. We have already successfully modeled physical properties of materials, materials processes, and current transport in discrete devices and designed QHS to optimize device performance.  We will grow the semiconductor epilayers and nanostructures from the vapor phase in our own laboratory, and will characterize them ourselves or through a wide network of solid collaborations established through the years. We will use high-resolution X-ray diffraction, transmission electron microscopy, SQUID magnetometry and low temperature magneto-transport, and a combination of optical measurements such as optical absorption, photoluminescence (PL), PL excitation spectroscopy and time-resolved PL. Most of this research will build upon and extend our previous work in the area of strained III-V compounds (including dilute nitrides), with the addition of new organometallic precursors to grow Cr-, Gd- and Mn-containing alloys. Thus, additional funding is requested in a separate proposal to complete and upgrade a Metal Organic Vapor Phase Epitaxy reactor, dedicated to MS alloys. The objectives of our research are many-fold but the most relevant are:  (i) to enhance our understanding of the material properties (structural, optical, magnetic and transport) in relation to growth from the vapor phase and (ii) to design, improve and apply the QHS in innovative discrete device designs both for optoelectronic and spintronic applications. Novel magnetic semiconductor structures will open pathways to control and manipulate the spin of carriers which is expected to lead to novel information technologies.

诸如磁性半导体（MS）合金和量子异质结构（QHS）之类的材料（例如嵌入式量子点（QD））在自旋和光子应用中起着重要作用，并且对技术创新至关重要。我的建议将重点放在（1）QHS和MS合金的外延生长以及（2）它们在离散设备中的表征和应用。我们将继续对应变的III-V化合物QHS进行持续的研究，其中包括多层相干QD的堆栈，用于光电设备的应用，例如红外光电探测器。我们的研究具有强大的实验组成部分，通常通过理论分析和建模完成。我们已经成功地建模了材料，材料过程和当前运输的物理特性，并设计了QHS以优化设备性能。我们将从我们自己的实验室中的蒸气阶段从蒸气阶段种植半导体的屈服者和纳米结构，并将自己的特征或通过多年来建立的稳固合作网络来表征它们。我们将使用高分辨率的X射线衍射，透射电子显微镜，鱿鱼磁力测定法和低温磁电机，以及光学测量值（例如光吸收，光致发光（PL），PL兴奋光谱光谱光谱和时间分辨PL）的组合。这项研究的大部分将基于并扩展我们以前在紧张的III-V化合物区域（包括稀氮化物）的工作，并添加了新的有机前体，以生长含Cr-，GD-和MN的合金。这是在单独的建议中要求额外的资金，以完成和升级用于MS合金的金属有机蒸气相外延反应器。我们研究的目标是多种多样的，但最相关的是：（i）增强我们对蒸气阶段增长的材料特性（结构，光学，磁性和运输）的理解，以及（ii）设计，改进和应用QHS在创新的离散设备设计中，均用于OptoElectRonic和OptoElectRonic和Pertronic应用程序。新型的磁性半导体结构将打开控制和操纵载体的自旋途径，这有望导致新的信息技术。