Materials World Network: Science of Polar Homo- and Heterointerfaces

材料世界网络：极性同质和异质界面科学

• 批准号: 1108071
• 负责人: Jon-Paul Maria
• 金额: $ 60万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2016-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1108071&HistoricalAwards=false
• 关键词: Materials; World; Network; Science; Polar; Materials; World; Network; Science; Polar

A focused international research collaboration linking North Carolina State University, the Technical University Berlin (TUB) and the Leibniz-Institut für Kristallzüchtung (IKZ) in Berlin, Germany, explores the fundamental science of epitaxial interfaces that define a discontinuity in electrical polarization in nitride-nitride and nitride-oxide systems. The aim is to understand the structural, chemical, and electronic features that regulate the interfacial electronic properties. The effort is based on a hypothesis that vertical and lateral heteropolar interfaces that approach 'semiconductor-grade' quality can be prepared, and that their study will lead to exciting opportunities for fundamental advances in interface physics and optic/electronic functionality. Each member of the international team brings a unique and leading edge technical capability that collectively enables this research. The Sitar group (NC State) brings a metalorganic chemical vapor deposition technology that can control polarity in thin films of nitride semiconductors both laterally and vertically; the Maria group (NC State) developed a surfactant-assisted molecular beam epitaxy technique that can for the first time prepare cubic oxides on GaN surfaces with a 2-D growth mode and dramatically reduced defect concentrations; the Hoffmann group (TUB) brings in optical characterization of polar materials and heterostructures; and the Albrecht group (IKZ) brings aberration-corrected transmission electron microscopy characterization with sub-Å spatial resolution and sub-eV energy resolution. The research refines synthesis techniques that enable hybrid thin film structures that seamlessly merge oxides and nitrides with heretofore unachievable material quality. By combining synthesis and characterization the investigators are able to identify and understand the structural and chemical features that enable, interfere, or enhance heteropolar interface coupling.Achieving an understanding of heteropolar interface-property relationships will propel research in hybrid systems that lead to new physics, new functionality, an expanded set of low dimension optoelectronic devices, and a pathway to smart structures that utilize in a new way the non-linear dielectric response of ferroelectrics. Through this collaboration, students and faculty from NCSU, TUB, and IKZ have access to mentoring expertise and world-class laboratory facilities in technical areas that are absent from the home institutions. U.S. and German students participate in a 6-month graduate sabbatical in program year three to ensure substantive international experience. During their first two years, U.S. students are encouraged take two semesters of German to acquire basic communication skills. The work of the German participants is supported by the German Research Foundation (DFG).

A focused international research collaboration linking North Carolina State University, the Technical University Berlin (TUB) and the Leibniz-Institut für Kristallzüchtung (IKZ) in Berlin, Germany, explores the fundamental science of epitaxial interfaces that define a discontinuity in electrical polarization in nitride-nitride and nitride-oxide systems.目的是了解调节内部电子特性的结构，化学和电子特征。这项工作是基于一个假设，即可以准备“半导体级”质量的垂直和外侧异形界面，并且他们的研究将为界面物理学和光学/电子功能的基本进步带来令人兴奋的机会。国际团队的每个成员都带来了独特而领先的技术能力，共同实现了这项研究。 Sitar组（NC状态）带来了一种金属有机化学蒸气沉积技术，该技术可以在硝酸盐半导体的薄膜中控制横向和垂直方向的极性。玛丽亚组（NC状态）开发了一种表面活性剂辅助的分子束外延技术，该技术可以首次在具有2-D生长模式的GAN表面上制备立方氧化物，并大大降低了缺陷浓度。霍夫曼组（TUB）带来了极性材料和异质结构的光学表征。 Albrecht组（IKZ）带来了通过子-Å空间分辨率和子EV能量分辨率的异常校正的透射电子显微镜表征。该研究完善了合成技术，使混合薄膜结构能够无缝将氧化物和硝化物与迄今难以实现的材料质量合并。 By combining synthesis and characterization the investigators are able to identify and understand the structural and chemical features that enable, interfering, or enhance heteropolar interface coupling.Achieving an understanding of heteropolar interface-property relationships will propel research in hybrid systems that lead to new physics, new functionality, an expanded set of low dimension optoelectronic devices, and a pathway to smart structures that utilize in a new way the铁电的非线性词典响应。通过这种合作，来自NCSU，TUB和IKZ的学生和教职员工可以在国内机构缺乏的技术领域中获得心理化的专业知识和世界一流的实验室设施。美国和德国学生参加了第三年的6个月毕业生，以确保实质性的国际经验。在他们的头两年中，鼓励美国学生参加两个学期的德语，以获得基本的沟通技巧。德国参与者的工作得到了德国研究基金会（DFG）的支持。