Investigation of Metal-C60 Interfaces and Layered Thin-Film Structures

w：\awards\awards96\num.doc 9705224 Hebard 这个实验项目的重点是涉及薄膜的C-60，包括碱金属掺杂的C-60固体，和可能感兴趣的配置界面的属性 电子 装置. 在工作中，C-60将在 与各种金属、绝缘体或半导体顺序或同时沉积。将使用各种沉积技术，包括热升华、离子束溅射和电子束 暖气 现场表征将 主要 可以通过沉积期间和之后的电传输测量来实现。这些测量不仅涉及面内传输 但 隧道和电力 领域 效果测量。 对于空气稳定或钝化的样品，将通过X射线、AFM、STM、磁迁移以及光学和红外吸收进行额外表征。C-60的高电子亲和力和相对容易的嵌入将是研究项目的核心方面。 一个项目将涉及三层结构中的电子隧穿，以进一步了解碱掺杂化合物中的超导性，并确定与界面相关的振动和电子态以及隧道势垒中隔离分子的预期相对较大的库仑间隙。 本研究项目 是跨学科性质，将涉及研究生 以及本科生，他们将在工业，政府和学术界接受出色的职业培训。 %这个实验项目是基于新的和潜在的非常有用的 电子导电薄膜基 对 碳六十分子 这些分子就像是由60个化学键合的碳原子组成的空心球体，看起来像是一个小小的足球。 这些分子相对较新，尚未探索，特别是在 它们形成绝缘、导电甚至超导薄膜的潜力。 在碳-60中加入碱金属如钠或钾以提供“电掺杂”是可能的，这种掺杂可以促进电导，甚至在高达30开尔文的温度下具有超导性。这个实验项目的工作将部分涉及“三明治结构”，这种结构可以执行可能在电子设备中有用的功能。 这项工作将使人们更好地了解 传统金属、绝缘体和半导体之间的界面与碳六十分子的膜之间的电行为，并且将可能导致这种界面的应用。这个研究项目是跨学科的性质，将涉及本科生和研究生谁将是优秀的 为在工业界、政府和学术界任职而接受培训。 ***

w:\awards\awards96\num.doc 9705224 Hebard This experimental project focuses on the properties of interfaces involving thin films of C-60, including alkali-metal-doped C-60 solids, and configurations which might be of interest in electronic devices. In the work, C-60 will be deposited sequentially or simultaneously with various metals, insulators or semiconductors. A variety of deposition techniques will be used including thermal sublimation, ion-beam sputtering and electron beam heating. In-situ characterization will primarily be accomplished by electrical transport measurements during and after deposition. These measurements involve not only in-plane transport but also tunneling and electric field effect measurements. For air-stable or passivated samples, additional characterization by x-rays, AFM, STM, magnetotransport, and optical and infrared absorption will be made. The high electron affinity and the relative ease of intercalation of C-60 will be aspects central to the research projects. One project will involve electron tunneling in trilayer structures to further understanding of superconductivity in the alkali-doped compounds and to determine the interface-related vibrational and electronic states and the expected relatively large Coulomb gap of molecules isolated in the tunnel barrier. This research project is interdisciplinary in nature and will involve graduate and undergraduate students who will be excellently trained for careers in industry, government and academia. %%% This experimental project is based on novel and potentially very useful electronic conducting films based on carbon-sixty molecules. Such molecules are like hollow spheres comprised of sixty chemically bonded carbon atoms, resembling tiny soccer balls. These molecules are relatively new and unexplored, especially in terms of their potential for forming insulating, electrically conducting, and even superconducting thin films. It has been possible to add alkali metals such as sodium or potassium to carbon-sixty to provide "electrical doping" which fosters electrical conduction and even superconductivity to temperatures up to about 30 Kelvin degrees. The work in this experimental project will, in part, involve "sandwich structures" which could perform functions which might be useful in electronic devices. This work will lead to a much better understanding of the electrical behavior of interfaces between conventional metals, insulators, and semiconductors, with films of the carbon- sixty molecules, and will possibly lead to applications for such interfaces. This research project is interdisciplinary in nature and will involve undergraduate and graduate students who will be excellently trained for positions in industry, government and academia. ***