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：杂化有机-无机卤化物钙钛矿中的电荷传输非技术性：杂化有机-无机三卤化物钙钛矿已成为大规模光伏发电最有前途的竞争者之一。这些材料表现出一系列卓越的性能，加上较低的生产成本，导致了对该主题的大量研究和令人称赞的增长。然而，与大多数成熟技术不同的是，该领域见证的创新超出了我们对这些材料基本特性的理解。此外，混合钙钛矿含有铅，这对环境有害，阻碍了它们在未来的应用中的应用。该项目是维克森林大学的一个研究小组与犹他大学的一个研究小组合作的成果，该研究小组拥有器件制造和电气特性方面的专业知识，而犹他大学拥有材料生长、光学和磁场效应测量方面的知识。该研究将重点研究限制混合钙钛矿器件运行和稳定性的电子过程；设计和实施可提高性能的设备结构；并开发无铅杂化钙钛矿。在混合钙钛矿电子器件预期对美国经济和社会产生巨大影响的推动下，这一跨学科研究计划将通过实施强有力的教学和指导部分来整合教育，以补充研究工作的各个阶段。技术：该研究将重点关注新型杂化有机-无机钙钛矿（HTP）单晶和薄膜生长、结构、光学和电学表征、器件设计、制造和表征，目标如下：（i）开发无铅材料杂化钙钛矿； (ii) 了解杂化钙钛矿材料中的电荷传输机制； (iii) 阐明电子和离子输运之间的共存及其对 HTP 器件滞后、性能、可靠性和稳定性的贡献。该项目分为三个阶段。第一阶段的重点是使用飞行时间、空间电荷限制电流和各种温度下的 FET 测量来研究 HTP 中的电荷传输。在第二阶段，我们将通过执行普尔-弗兰克尔和态密度分析来重点分析体和表面缺陷态。在第三阶段，PI 将利用黑暗和光照下的塞贝克效应以及阻抗谱来理清离子和电子对 HTP 器件电导率的贡献。 PI 及其研究小组将继续并扩大努力，通过组织会议、参加当地科学博物馆的活动以及为当地社区学院和高中的学生提供研究机会，致力于促进钙钛矿电子学新领域的发展。