Collaborative Research: Carrier transport in organometal halide perovskite devices

合作研究：有机金属卤化物钙钛矿器件中的载流子传输

• 批准号: 1608095
• 负责人: Oana Jurchescu
• 金额: $ 22.5万
• 依托单位: Wake Forest University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1608095&HistoricalAwards=false
• 关键词: Collaborative; Research; Carrier; transport; organometal

Abstract Title: Charge transport in hybrid organic-inorganic halide perovskitesNon-technical:Hybrid organic-inorganic trihalide perovskites have emerged as one of the most promising contenders for large scale photovoltaic energy generation. These materials exhibit a remarkable set of properties, coupled with low production cost, which led to an avalanche of research on this topic and a commendable growth. Unlike most mature technologies, however, the innovation witnessed in the field outstripped our understanding of basic these materials properties. In addition, the hybrid perovskites contain lead, which represent an environmental hazard, precluding their incorporation in future applications. This project is a collaborative effort between a research group at Wake Forest University with expertise in device fabrication and electrical characterization and a group at University of Utah with knowledge on materials growth, optical and magnetic field effect measurements. The research will focus on the investigation of the electronic processes that limit the operation and stability of hybrid perovskite-based devices; designing and implementing device structures that promote improved performance; and developing lead-free hybrid perovskites. Driven by the anticipated high impact of hybrid perovskite electronics on the US economy and society, this interdisciplinary research program will integrate education by implementing a strong teaching and mentoring component that complements all stages of the research efforts. Technical:The research will focus on novel hybrid organic-inorganic perovskites (HTP) single crystals and thin-film growth, structural, optical and electrical characterization, device design, fabrication, and characterization with the following objectives: (i) develop Pb-free hybrid perovskites; (ii) understand the mechanism of charge transport in hybrid perovskite materials; (iii) elucidate the coexistence between the electronic and ionic transport and their contribution to HTP device hysteresis, performance, reliability and stability. The project is structured into three phases. The first phase focuses on the study of charge transport in HTPs using time of flight, space-charge-limited current and FET measurements at various temperatures. In the second phase we will focus on the analysis of bulk and surface defect states by performing Poole-Frenkel and density of states analysis. In the third phase the PIs will disentangle the ionic and electronic contributions to the conductivity in HTP devices using Seebeck effect in the dark and under illumination, and impedance spectroscopy. The PIs and their research groups will continue and expand their efforts dedicated to enhancing the growth of the new field of perovskite electronics by organizing conferences, participating in activities at local science museums, and offering research opportunities to students from local community colleges and high schools.

摘要标题：有机-无机卤化物复合钙钛矿中的电荷传输非技术性：有机-无机复合三卤化物钙钛矿已成为大规模光伏发电的最有前途的竞争者之一。这些材料表现出一系列显著的性能，再加上低的生产成本，导致了这一主题的研究雪崩和值得称赞的增长。然而，与大多数成熟技术不同的是，该领域的创新超出了我们对这些材料基本性质的理解。此外，混合钙钛矿含有铅，这对环境造成了危害，阻碍了它们在未来的应用中。该项目是维克森林大学一个在器件制造和电学表征方面拥有专业知识的研究小组与犹他大学一个拥有材料生长、光学和磁场效应测量知识的研究小组共同努力的成果。这项研究将侧重于研究限制混合钙钛矿型器件运行和稳定性的电子工艺；设计和实施促进性能提高的器件结构；以及开发无铅混合钙钛矿。在混合钙钛矿电子产品对美国经济和社会预期的巨大影响的推动下，这一跨学科研究项目将通过实施与研究工作的所有阶段相辅相成的强大教学和指导部分来整合教育。技术：本研究将集中于新型有机-无机钙钛矿(HTP)杂化单晶和薄膜的生长、结构、光学和电学表征、器件设计、制备和表征，目标如下：(I)开发无铅杂化钙钛矿；(Ii)了解杂化钙钛矿材料中的电荷传输机制；(Iii)阐明电子和离子传输的共存及其对HTP器件磁滞、性能、可靠性和稳定性的贡献。该项目分为三个阶段。第一阶段主要是利用飞行时间、空间电荷限制电流和不同温度下的场效应管测量来研究高温超导中的电荷传输。在第二阶段，我们将通过Poole-Frenkel和态密度分析来分析体缺陷态和表面缺陷态。在第三阶段，PI将利用黑暗和光照下的Seebeck效应以及阻抗谱来解开离子和电子对HTP器件导电性的贡献。PIS及其研究小组将继续并扩大他们致力于促进钙钛矿电子新领域增长的努力，方法是组织会议，参加当地科学博物馆的活动，并为当地社区大学和高中的学生提供研究机会。