NER: Modulation doped colloidal quantum dots and solution-based semiconductor nanowires

NER：调制掺杂胶体量子点和基于溶液的半导体纳米线

• 批准号: 0609172
• 负责人: Masaru Kuno
• 金额: $ 9.81万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0609172&HistoricalAwards=false
• 关键词: NER; Modulation; doped; colloidal; quantum

The objective of this research is to develop a generic doping strategy for solution-based colloidal quantum dots and semiconductor nanowires. The approach is based on the concept of modulation doping, first developed for bulk semiconductors. Within the context of the proposed work, this study specifically entails passivating colloidal quantum dots and nanowires with another semiconductor in a core/shell or coaxial configuration. Dopant atoms will simultaneously be incorporated into the outer semiconductor cladding, enabling the spatially indirect doping of the targeted material because of favorable band offsets at the interface. This approach bypasses longstanding problems associated with the direct substitutional doping of nanostructured materials. The intellectual merit of the proposed work includes the development of an alternative, yet generic, doping strategy for nanoscale materials. It also addresses the doping of solution-based semiconductor nanowires, which has yet to be accomplished. The broader impact of the work includes the possible development of nanowire-based devices involving branched nanowire morphologies such as those with tripod, v-, and y-shapes. More immediate applications include the possible development of dual contrast agents for biological tagging applications. This is achieved by preserving the high fluorescence quantum yields of native nanostructures while simultaneously incorporating spin active impurities into an outer cladding layer. Such nanostructures can then be imaged via divergent techniques such as fluorescence resonance energy transfer and/or magnetic resonance imaging. Broader Impact:All proposed studies are tied into educational initiatives by the PI and Co-PI to expose undergraduates and local area high school teachers to the emerging field of nanoscience.

本研究的目的是开发一种通用的掺杂策略，基于溶液的胶体量子点和半导体纳米线。 该方法是基于调制掺杂的概念，首先开发的散装半导体。 在拟议工作的背景下，这项研究特别需要钝化胶体量子点和纳米线与另一种半导体在核/壳或同轴配置。 掺杂剂原子将同时并入到外部半导体包层中，由于界面处有利的带偏移，使得能够对目标材料进行空间间接掺杂。 这种方法绕过了与纳米结构材料的直接替代掺杂相关的长期存在的问题。 拟议工作的智力价值包括为纳米级材料开发一种替代性但通用的掺杂策略。 它还解决了基于溶液的半导体纳米线的掺杂，这还没有完成。 这项工作的更广泛影响包括可能开发基于纳米线的器件，这些器件涉及分支纳米线形态，如三角形，v形和y形。 更直接的应用包括可能开发用于生物标记应用的双重造影剂。 这是通过保持天然纳米结构的高荧光量子产率，同时将自旋活性杂质掺入外包层中来实现的。 然后可以通过发散技术（例如荧光共振能量转移和/或磁共振成像）对这种纳米结构进行成像。 更广泛的影响：所有拟议的研究都与PI和Co-PI的教育计划挂钩，使本科生和当地高中教师接触纳米科学的新兴领域。