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

非技术性摘要。本研究的重点是在单个器件中集成新型半导体材料的人工合成异质结的实验研究。当某些材料在物理接触中结合在一起时，接触可以显示出不同于原始材料的新的有趣的特性，例如，高导电性，电子自由流动，不被缺陷捕获。这样的特性对未来的电子和光子设备可能是有利的，例如晶体管、发光二极管和太阳能电池。这些异质结构也可以用来研究半导体的基本本征性质，而不是被缺陷所掩盖。可以组合在功能范德华异质结构中的材料类型有有机半导体、具有惰性(范德华)表面的无机层状材料和有机聚合物。新兴电子材料的研究是基础物理和应用研究重叠的领域，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最新发展，掌握现代研究技能，并为在科学和工程领域取得成功做好准备。技术摘要。范德华(Van Der Waals)异质界面的载流子输运物理，特别是含有极性官能团的非共轭含氟聚合物与新型半导体之间的界面，包括有机分子晶体和层状无机纳米材料(单层材料)，是本项目的重点。了解最近在这种界面上观察到的诱导表面传导性和“陷阱愈合”效应的机制，是该活动的主要推动力。在这类界面上出现的一些有趣的输运现象，包括抑制的载流子陷阱和低噪声传导，导致观察到高分辨率的霍尔效应，使研究团队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本征(无陷阱)电荷输运机制。低温输运和霍尔效应测量，结合光电激发光谱，被用来研究这些界面。该项目的实施有望导致新型半导体异质结构的发展，促进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，特别是对新兴的溶液处理半导体来说，并更广泛地有助于更好地了解新型材料的电子和光学性质。该项目的跨学科性质提供了极好的教育、人力资源和外展机会，包括培训学生和博士后。

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.