CAREER: Low Loss, Tunable Ferroelectric Thin Films by Pulsed Laser Deposition

职业：通过脉冲激光沉积制备低损耗、可调谐铁电薄膜

• 批准号: 9702632
• 负责人: Xiaoxing Xi
• 金额: $ 30万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 2002-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9702632&HistoricalAwards=false
• 关键词: CAREER; Low; Loss; Tunable; Ferroelectric

9702632 Xiaoxing Xi The research of this CAREER project studies the dielectric nonlinearity and microwave losses of ferroelectric thin films deposited by Pulsed Laser Deposition. Compared to bulk single crystals, the nonlinearity of ferroelectric thin films is smaller and the loss is higher, the cause of which is not well understood. This project aims to address these problems by focusing on the effects of four factors: (1) Stoichiometry; (2) Crystallinity; (3) Interface layers and space charges; and (4) Soft-mode phonons. The goal of the research is to reveal the fundamental mechanisms so as to reduce the losses while maintaining a high nonlinearity in ferroelectric thin films. The education plan is to develop a "Ferroelectric Thin Films" experiment for the Physics undergraduate laboratory course, which includes film deposition, structural and electrical characterizations and data analysis. %%% This integrated CAREER research and education project focuses on ferroelectric thin films used in voltage-tunable microwave devices. Such application requires large dielectric nonlinearity and low microwave losses in ferroelectric thin films. This research aims to reveal the fundamental mechanisms that determine these properties in order to improve them thus impacting the development of ferroelectric tunable microwave device technologies. The education plan attempts to incorporate research experience into the physics undergraduate curriculum. A "Ferroelectric Thin Films" experiment will be developed and included in the regular laboratory course so that students can get real-life research experience in this course. ***

小行星9702632 本项目主要研究脉冲激光沉积铁电薄膜的介电非线性和微波损耗。 与大块单晶相比，铁电薄膜的非线性较小，损耗较大，其原因尚不清楚。 该项目旨在通过关注以下四个因素的影响来解决这些问题：（1）化学计量;（2）结晶度;（3）界面层和空间电荷;以及（4）软模声子。研究的目的是揭示铁电薄膜在保持高非线性的同时降低损耗的基本机理。 教育计划是开发一个“铁电薄膜”的物理本科实验课程，其中包括薄膜沉积，结构和电气特性和数据分析实验。 %%% 这个综合职业研究和教育项目的重点是在电压可调微波器件中使用的铁电薄膜。 这种应用要求铁电薄膜具有大的介电非线性和低的微波损耗。 本研究旨在揭示决定这些特性的基本机制，以改善它们，从而影响铁电可调谐微波器件技术的发展。 该教育计划试图将研究经验纳入物理本科课程。 本课程将发展“铁电薄膜”实验，并将其纳入常规实验课程，让学生在本课程中获得真实的研究经验。 ***