Charge transport and trap-healing effect at semiconductor/polymer heterointerfaces.

半导体/聚合物异质界面的电荷传输和陷阱修复效应。

• 批准号: 1506609
• 负责人: Vitaly Podzorov
• 金额: $ 34.05万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1506609&HistoricalAwards=false
• 关键词: Charge; transport; trap; healing; effect

Non-technical abstract. The focus of this research project is an experimental study of artificially synthesized heterostructures based on novel semiconducting materials combined in a single device. When certain materials are brought together in physical contact, the contact can exhibit new interesting properties, different from the properties of the original materials, including, for instance, high electrical conductivity, with electrons flowing freely, without being captured by defects. Such properties can be advantageous for future electronic and photonic devices, such as transistors, light-emitting diodes and solar cells. These heterostructures can also be used to study the fundamental intrinsic properties of semiconductors, not masked by defects. The types of materials that can be combined in functional van der Waals heterostructures are organic semiconductors, inorganic layered materials with inert (van der Waals) surfaces and organic polymers. Research on emergent electronic materials, where fundamental physics and applied studies overlap, represents an excellent opportunity for students to learn about current developments in semiconductor physics and technology, acquire modern research skills and become prepared for a successful career in science and engineering. Technical Abstract. The physics of charge carrier transport at van der Waals heterointerfaces, in particular interfaces between non-conjugated fluoropolymers with incorporated polar functional groups and novel semiconductors, including organic molecular crystals and layered inorganic nanomaterials (monolayer materials), is the focus of this project. Understanding the mechanisms of induced surface conductivity and "trap healing" effect, recently observed at such interfaces, is the main thrust of the activity. Several interesting transport phenomena emerging at this kind of interfaces, including suppressed carrier trapping and low-noise conduction, leading to the observation of a high-resolution Hall effect, enable the research team to experimentally access the intrinsic (trap-free) charge transport regime in a variety of organic semiconductors and novel layered inorganic nanomaterials. Low-temperature transport and Hall effect measurements, combined with a photo-current excitation spectroscopy, are used to study these interfaces. Implementation of the project is expected to result in the development of novel semiconductor heterostructures, stimulate synthesis and applications of novel functional polymers, lead to new methodologies of high-precision Hall effect measurements, especially important for emergent solution-processed semiconductors, and more broadly contribute to a better understanding of electronic and optical properties of novel materials. The interdisciplinary nature of this project provides excellent educational, human resource and outreach opportunities, including training of students and postdocs.

非技术性抽象。 该研究项目的重点是基于新型半导体材料的人工合成异质结构的实验研究。 当某些材料以物理接触的方式放在一起时，接触可以表现出与原始材料的性质不同的新的有趣的性质，包括例如高电导率，电子自由流动，而不会被缺陷捕获。 这种性质对于未来的电子和光子器件，如晶体管、发光二极管和太阳能电池是有利的。 这些异质结构也可用于研究半导体的基本本征性质，而不会被缺陷所掩盖。 可以结合在功能性货车德瓦尔斯异质结构中的材料类型是有机半导体、具有惰性（货车德瓦尔斯）表面的无机层状材料和有机聚合物。对新兴电子材料的研究，基础物理学和应用研究重叠，为学生提供了一个极好的机会，让他们了解半导体物理和技术的当前发展，获得现代研究技能，并为科学和工程的成功职业生涯做好准备。 技术摘要。电荷载流子在货车德瓦耳斯异质界面的传输物理学，特别是具有极性官能团的非共轭含氟聚合物与新型半导体（包括有机分子晶体和层状无机纳米材料（单层材料））之间的界面，是该项目的重点。 了解最近在这种界面上观察到的诱导表面电导率和“陷阱愈合”效应的机制是这项活动的主要目的。 在这种界面上出现的几种有趣的传输现象，包括抑制载流子捕获和低噪声传导，导致观察到高分辨率霍尔效应，使研究小组能够通过实验获得各种有机半导体和新型层状无机纳米材料中的固有（无陷阱）电荷传输机制。 低温传输和霍尔效应测量，结合光电流激发光谱，被用来研究这些接口。 该项目的实施预计将导致新型半导体异质结构的开发，刺激新型功能聚合物的合成和应用，导致高精度霍尔效应测量的新方法，对于紧急溶液处理的半导体尤其重要，并更广泛地有助于更好地理解新型材料的电子和光学特性。 该项目的跨学科性质提供了良好的教育，人力资源和推广机会，包括学生和博士后的培训。