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.

该奖项是由美国调查人员及其在德国同行的国际化学合作中的化学合作部的大分子，超分子和纳米化学计划颁发的，并由国际科学与工程办公室共同资助。接收者是加利福尼亚戴维斯大学的苏珊·考斯拉里奇教授。太阳能转化等应用在限制效率的设备体系结构中面临着基本挑战。半导体纳米颗粒（NP）目前是太阳能转化的活跃领域，具有可调带隙对潜在载体乘法的好处。硅是感兴趣的半导体NP之一。但是，关于电子结构的性质，仍然存在很多争论。特别是，表面氧化和界面终止在确定光学间隙和电子特性方面起着重要作用。 Si（1-X）GEX NP的合成允许对带隙进行系统调整，而不会更改NP的大小。此外，关于无机半导体之间的可逆电荷传输通常表现出类似带状电子结构和具有局部电子状态的有机半导体的基本问题。该项目的目的是研究Si或Si（1-X）GEX合金的无机纳米颗粒与孔传导有机分子之间的电荷转运。 有机分子通过Si-C键共价键在纳米颗粒表面上。在此P型系统中获得对电子传输过程的见解与光伏相关。该项目的合成重点在于纳米颗粒的表面功能化。该项目的这个组成部分是美国合作伙伴项目的主题。 纯Si和Si-GE合金纳米颗粒具有非常活性，其合成和表面化学是开放的研究领域。该项目的德国组成部分着重于合成有机体盖纳米颗粒的光电测量。该项目确保指导妇女和少数族裔学生，并在校园范围内和全国范围内参加研究团队的参与，例如“农业，信件和科学本科研究人员的成员”（壁画），“研究生教育和教授联盟”（年龄）（年龄），STEM，STEM，STEM，与国家实验室合作，与国家实验室进行共同培训学生，教学，教学，教学。在加州大学戴维斯分校（UC Davis），招募了代表性不足的本科生（MURPPS计划）和高中生（ACS SEED）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。