Fabrication of Large-Area and Large-Bandgap Semiconducting Graphene Materials

该项目的首要目标是学习如何通过自上而下的纳米图案和纳米制造方法在石墨烯中打开技术相关的带隙，可以扩展到大面积。我们的具体目标是：(1)定制和减小纳米图案的尺寸和形状，以实现更大的带隙0.5 eV；(2)学习如何缩放到~5x5 cm2或更大的晶圆？半导体石墨烯；(3)控制石墨烯边缘的原子功能化，这随着特征尺寸的减小而变得越来越重要；(4)展示半导体石墨烯电子器件的晶圆范围阵列的主要证明。我们以可扩展的方式制造大带隙石墨烯的纳米制造方法将采用自定向光刻模板。模板将基于嵌段共聚物和小分子，这些小分子将被定制为在石墨烯上自组装，具有前所未有的图案化分辨率，并将与受控的自上而下图案化结合使用，以控制石墨烯的电子行为。更广泛的意义和重要性：石墨烯由于其特殊的电子、光学、机械和热性能，最近受到了广泛的关注。虽然没有图案的石墨烯不是半导体，但纳米图案的石墨烯就像半导体一样，这意味着它的导电性可以切换。在吗?和? ?。这激发了人们对半导体石墨烯在电子、红外光电子和光子学、生物传感和太阳能收集方面的兴奋，人们希望利用石墨烯？这些应用程序的特殊属性。拟议的研究将在新的纳米制造工艺中达到高潮，这将使制造大面积晶圆成为可能。技术相关的半导体石墨烯。半导体石墨烯晶片？将成为变革和强大的材料平台，推出基于碳纳米技术的下一代广泛应用。主要研究人员还将指导本科生和代表性不足的学生进行研究，并参加威斯康星大学麦迪逊分校的一门课程，该课程旨在让实验室科学家和科学传播者开发和使用有效的策略，与公众就科学和技术，特别是纳米技术进行交流。

The overarching goal of this project is to learn how to open up a technologically relevant bandgap in graphene via top-down nanopatterning and nanomanufacturing approaches that can be scaled to large-areas. Our specific objectives are to: (1) tailor and reduce nanopattern- size and shape to achieve larger bandgaps 0.5 eV; (2) learn how to scale to ~5x5 cm2 or larger ?wafers? of semiconducting graphene; (3) control the atomic functionalization of graphene edges which become increasingly important as feature-size is reduced; and (4) demonstrate proof-of-principal wafer-wide arrays of semiconducting graphene electronic devices. Our approach for nanomanufacturing large bandgap graphene in a scalable fashion will be to employ self-directed lithographic templates. The templates will be based on block copolymers and small molecules that will be tailored to self-assemble on graphene with unprecedented patterning resolution and will be used in conjunction with controlled top-down patterning to control the electronic behaviors of graphene. Broader significant and importance: Graphene has received substantial attention recently because of its exceptional electronic, optical, mechanical, and thermal properties. While unpatterned graphene is not a semiconductor, nanopatterned graphene acts like one, meaning that its electrical conductivity can be switched ?ON? and ?OFF?. This has spurred excitement for semiconducting graphene in electronics, infrared optoelectronics and photonics, biosensing, and solar energy harvesting in hopes of exploiting graphene?s exceptional properties for these applications. The proposed research will culminate in novel nanomanufacturing processes that will enable the fabrication of large-area ?wafers? of technologically relevant semiconducting graphene. The semiconducting graphene ?wafers? will be transformative and powerful materials platforms for launching a wide range of next-generation applications based on carbon nanotechnology. The principal investigators will also mentor undergraduate and under-represented students in research and participate in a course at UW-Madison designed to allow bench scientists and science communicators to develop and use effective strategies for communicating with the general public about science and technology, particularly about nanotechnology.