Coupling between Piezoelectricity and Charge Transport Property in ZnO Nanowires

ZnO 纳米线压电与电荷传输特性之间的耦合

• 批准号: 0905914
• 负责人: Xudong Wang
• 金额: $ 25.72万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0905914&HistoricalAwards=false
• 关键词: Coupling; between; Piezoelectricity; Charge; Transport

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Technical: The objective of this project is to study and understand fundamental phenomena underlying the interaction between the piezoelectric potential and charge transport behavior in ZnO one-dimensional nanostructures. The research aims to (1) correlate the intensity and distribution of piezoelectric potential in a ZnO nanowire with the size, strain and carrier density and to reveal the free charge screening effect on the piezoelectricity; (2) investigate how the carrier mobility is regulated by the piezoelectric field across a ZnO nanowire channel; (3) establish a general relationship between the carrier mobility and the nanowire's basic physical properties, including size, strain and carrier density. Zinc oxide nanowires with a rectangular cross section are synthesized and used for the piezoelectric and electric characterization. The research also plans to fabricate piezoelectricity-gated transistors using ZnO nanowires and to study these transistors in order to validate the theoretical framework established under this project. Non-technical: The project addresses basic research issues in a topical area of materials science with high technological relevance. The success of the research is expected to lay a foundation for applying piezoelectric semiconductor nanomaterials in advanced sensing and energy harvesting nanodevices. The research component of the project is integrated with the PI's new graduate course on Nanomaterials and Nanotechnology and an undergraduate course on Ceramics. The project also provides an excellent opportunity for training graduate and undergraduate students with fabrication and characterization technologies in the frontier of nanoscience.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。技术：该项目的目标是研究和理解ZnO一维纳米结构中压电电势和电荷传输行为之间相互作用的基本现象。本研究的目的是（1）将ZnO纳米线中的压电势的强度和分布与纳米线的尺寸、应变和载流子密度联系起来，揭示自由电荷屏蔽效应对压电性的影响，（2）研究ZnO纳米线沟道中的压电场对载流子迁移率的调节作用，（3）研究ZnO纳米线沟道中的压电场对载流子迁移率的影响。（3）建立载流子迁移率与纳米线的基本物理性质（包括尺寸、应变和载流子密度）之间的一般关系。合成了具有矩形截面的氧化锌纳米线，并用于压电和电学表征。该研究还计划使用ZnO纳米线制造压电栅极晶体管，并研究这些晶体管，以验证该项目下建立的理论框架。非技术性：该项目涉及材料科学专题领域的基础研究问题，具有高度的技术相关性。该研究的成功有望为压电半导体纳米材料在先进传感和能量收集纳米器件中的应用奠定基础。该项目的研究部分与PI的纳米材料和纳米技术新研究生课程和陶瓷本科课程相结合。该项目还提供了一个很好的机会，培养研究生和本科生与制造和表征技术在纳米科学的前沿。