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Degradation of Organic Semiconductors: Functional and Mechanistic Descriptions from Macroscale to Nanoscale

有机半导体的降解：从宏观到纳米尺度的功能和机理描述

基本信息

批准号：
2003631
负责人：
Jeanne Pemberton
金额：
$ 59万
依托单位：
University of Arizona
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2024-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2003631&HistoricalAwards=false
关键词：
Degradation Organic Semiconductors Functional Mechanistic

项目摘要

Non-technical AbstractOrganic materials capable of conducting electricity – termed organic semiconductors - are used in many emerging, next-generation technologies including organic light emitting diodes, organic-based solar cells, thermoelectrics, and chemical sensors. The benefits of organic semiconductors include lower cost, improved performance, flexibility, transparency, and lower environmental impact, but concerns persist about their long-term stability and lifetime. The focus of this project – degradation of functional properties – is a fundamental materials chemistry challenge that must be overcome to progress the field of organic electronic devices. With support from the Solid State and Materials Chemistry Program in the Division of Materials Research, the researchers advance the understanding of materials and chemical degradation pathways at a fundamental level, which will eventually facilitate development of new materials design criteria. Hence, this work provides important new insights that drive the creation of new molecules and polymers and contributes to long-term stability and technological relevance of the United States in printable electronic materials and devices. Support from the Solid State and Materials Chemistry program also advances the development of unique capabilities for in operando characterization of organic semiconductor systems that are readily translatable to other active materials chemistry applications and enable identification of the chemical pathways that accompany degradation in materials at length scales from microns to nanometers. This inherently interdisciplinary effort between chemists and engineers is a platform for interdisciplinary training for the graduate and undergraduate students engaged in research. New interdisciplinary graduate- and undergraduate-level laboratory experiences are developed through this effort, and the properties of this important class of materials are explored in K-to-gray public outreach efforts. Technical AbstractPush-pull or donor-acceptor-type molecular and polymeric architectures have become the dominant class of active materials in organic electronics with performance metrics superior to earlier molecular designs. However, little attention has been devoted to understanding long-term stability. This fundamental effort directly examines and compares chemical structure, electronic structure, and charge transport characteristics of complex push-pull organic semiconductor (OSC) architectures as a function of molecular building block composition to understand the chemical, photochemical and photophysical mechanistic origins and functional impacts of degradation. The secondary impact of this effort is formulation of new design criteria for more robust OSCs. This work builds on successful efforts through a previous NSF DMR award (DMR-1608289) in which a collaborative, multi-disciplinary investigation of organic semiconductor degradation was initiated. Previously-demonstrated approaches include surveying functional characteristics under conditions that lead to degradation, coupled with detailed spectroscopic analysis methodologies to understand mechanistic molecular origins. In this project, capabilities are expanded to include local physical structure with site-specific molecular and electronic imaging capabilities, which enables investigation of fundamental materials chemistry across length scales ranging from microns to nanometers. In addition to improving materials design for emerging technologies, the broader impacts of this work manifests through numerous education and outreach activities This collaboration between chemists and engineers is a platform for interdisciplinary training for the graduate and undergraduate students engaged in research. New interdisciplinary graduate- and undergraduate-level laboratory experiences are developed through this effort, and the properties and uses of this important class of materials are explained and explored in K-to-gray outreach efforts.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

能够导电的有机材料-称为有机半导体-用于许多新兴的下一代技术，包括有机发光二极管、有机基太阳能电池、热电和化学传感器。有机半导体的优点包括成本低、性能提高、灵活性、透明度和对环境的影响较小，但人们对其长期稳定性和寿命的担忧仍然存在。该项目的重点-功能特性的降解-是一个基本的材料化学挑战，必须克服有机电子器件领域的进步。在材料研究部固态和材料化学项目的支持下，研究人员在基础层面上推进了对材料和化学降解途径的理解，这最终将促进新材料设计标准的发展。因此，这项工作提供了重要的新见解，推动了新分子和聚合物的创造，并有助于美国在可打印电子材料和设备方面的长期稳定性和技术相关性。从固态和材料化学计划的支持也推进了独特的能力的发展，在有机半导体系统的操作表征，很容易转换到其他活性材料化学应用，并能够识别伴随材料降解的化学途径在从微米到纳米的长度尺度。化学家和工程师之间的这种固有的跨学科努力是从事研究的研究生和本科生跨学科培训的平台。新的跨学科的研究生和本科生水平的实验室经验，通过这一努力开发，并在K到灰色的公共宣传工作中探索这类重要材料的属性。推拉或供体-受体型分子和聚合物结构已经成为有机电子学中活性材料的主要类别，其性能指标上级早期的分子设计。然而，很少有人关注长期稳定性。这种基本的努力直接检查和比较复杂的推挽式有机半导体（OSC）架构的化学结构，电子结构和电荷传输特性作为分子构建块组成的函数，以了解化学，光化学和光物理机制的起源和降解的功能影响。这项工作的第二个影响是制定新的设计标准，以实现更强大的OSC。这项工作建立在先前的NSF DMR奖（DMR-1608289）的成功努力之上，该奖项发起了对有机半导体降解的多学科合作调查。先前证明的方法包括在导致降解的条件下调查功能特性，再加上详细的光谱分析方法，以了解机制分子起源。在这个项目中，能力被扩展到包括具有特定位点的分子和电子成像能力的局部物理结构，这使得能够在从微米到纳米的长度尺度上研究基本材料化学。除了为新兴技术改进材料设计外，这项工作的更广泛影响还体现在许多教育和宣传活动中。化学家和工程师之间的这种合作是从事研究的研究生和本科生跨学科培训的平台。新的跨学科的研究生和本科生水平的实验室经验是通过这一努力，并解释和K-to-gray的推广工作中探索这一重要类别的材料的属性和用途。这个奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。