International Collaborations in Chemistry: Characterization of organically capped Si and group 14 alloy nanoparticle heterojunctions

国际化学合作：有机封端硅和第 14 族合金纳米粒子异质结的表征

• 批准号: 1026672
• 负责人: Susan Kauzlarich
• 金额: $ 43.5万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1026672&HistoricalAwards=false
• 关键词: International; Collaborations; Chemistry; Characterization; organically

This award is made by the Macromolecular, Supramolecular and Nanochemistry program of the Chemistry Division within the International Collaboration in Chemistry between US investigators and their counterparts in Germany and is co-funded by the Office of International Science and Engineering. The recipient is Professor Susan Kauzlarich of the University of the California-Davis. Applications such as solar energy conversion are faced with fundamental challenges in device architecture that limit efficiencies. Semiconductor nanoparticles (NP) are currently an active area of research in solar energy conversion with the benefits of a tunable band gap to potential carrier multiplication. Silicon is one of the semiconductor NPs of interest; however, there is still a great deal of debate concerning the nature of the electronic structure. In particular, the surface oxidation and interface termination play an important role in determining the optical gap and electronic properties. Synthesis of Si(1-x)Gex NPs allows for systematic tuning of the bandgap without changing size of the NP. In addition, the fundamental question concerning whether reversible charge transport between inorganic semiconductors typically exhibiting a band-like electronic structure and organic semiconductors featuring localized electronic states can take place freely is unanswered. The goal of this project is to study charge transport between inorganic nanoparticles of Si or Si(1-x)Gex alloys and hole-conducting organic molecules. The organic molecules are covalently bonded to the nanoparticle surface via Si-C bonds. Gaining insight on the electron transport process in this p-type system is relevant to photovoltaics. The synthesis focus of the project resides on the surface functionalization of the nanoparticles. This component of the project is the theme of the US partner's project. Pure Si and Si-Ge alloyed nanoparticles are very reactive and their synthesis and surface chemistry are opened fields of study. The German component of the project focuses on optoelectronic measurements of the synthesized organo-capped nanoparticles. The project ensures mentoring women and minority students and participation of the research team in campus-wide and nation-wide activities such as "Memberships for Undergraduate Researchers in Agriculture, Letters, and Science" (MURALS), "Alliance for Graduate Education and the Professoriate" (AGEP), STEM, collaboration with National Laboratories for joint training of students, teaching, and outreach activities. At UC Davis, underrepresented undergraduates (MURPPS program) and high school students (ACS SEED) are recruited to participate in this research. International exchange activities include two graduate students and three undergraduates having the opportunity to interact with peers at the University of Cologne.

该奖项由美国研究人员与德国同行之间的国际化学合作组织化学部的大分子、超分子和纳米化学项目颁发，并由国际科学与工程办公室共同资助。获奖者是加州大学戴维斯分校的苏珊·考兹拉里奇教授。太阳能转换等应用在设备架构方面面临着限制效率的基本挑战。半导体纳米颗粒（NP）是目前太阳能转换研究的一个活跃领域，具有可调的带隙，有利于潜在载流子的倍增。硅是我们感兴趣的半导体NPs之一；然而，关于电子结构的性质仍然存在大量的争论。特别是，表面氧化和界面终止在决定光学间隙和电子性能方面起着重要作用。Si(1-x)Gex NPs的合成允许在不改变NP尺寸的情况下系统地调整带隙。此外，关于具有带状电子结构的无机半导体和具有局域电子态的有机半导体之间的可逆电荷输运是否可以自由发生的基本问题尚未得到解答。本项目的目标是研究Si或Si(1-x)Gex合金的无机纳米颗粒与空穴导电有机分子之间的电荷传输。有机分子通过Si-C键与纳米颗粒表面共价结合。深入了解这种p型系统中的电子传递过程与光伏相关。该项目的合成重点在于纳米颗粒的表面功能化。该项目的这一组成部分是美国合作伙伴项目的主题。纯Si和Si- ge合金纳米颗粒具有很强的反应性，其合成和表面化学是一个开放的研究领域。该项目的德国部分侧重于合成的有机覆盖纳米颗粒的光电测量。该项目确保对女性和少数民族学生进行指导，并确保研究团队参与校园和全国范围的活动，如“农业、文学和科学本科研究人员会员资格”（MURALS）、“研究生教育和教授联盟”（AGEP）、STEM、与国家实验室合作，共同培训学生、教学和外展活动。在加州大学戴维斯分校，未被充分代表的本科生（MURPPS计划）和高中生（ACS SEED）被招募参加这项研究。国际交流活动包括两名研究生和三名本科生有机会与科隆大学的同龄人互动。