CAREER: Mechanical Behavior of Flexible Electronic Films

职业：柔性电子薄膜的机械行为

• 批准号: 1554322
• 负责人: Brendan O'Connor
• 金额: $ 50万
• 依托单位: North Carolina State 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: 2016-02-15 至 2022-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1554322&HistoricalAwards=false
• 关键词: CAREER; Mechanical; Behavior; Flexible; Electronic

The objective of this Faculty Early Career Development (CAREER) grant is to improve the understanding of the mechanical behavior of organic (polymeric) semiconductor films. Insight into the relationships between mechanical and electrical properties will provide guidelines to achieve mechanically robust flexible electronics for applications such as wearable electronics and low cost solar energy. Organic semiconductors are particularly promising for flexible electronics due to their relatively compliant nature associated with their molecular structure. Mechanical failure in use, primarily due to repeated flexing, has hindered the commercial adoption of organic films for flexible electronic applications. This award provides support to investigate the impact of molecular structure, film microstructure, and device design on performance variation and failure modes of devices under flexure. Research will also include the role of cyclic bending and environmental factors such as moisture on mechanical stability. This research crosses multiple disciplines including mechanics of materials, materials processing, and semiconductor device physics and will provide a stimulating training environment for students. The education plan includes the development of a certificate program in manufacturing and mechanics of emerging thin film electronics to train future leaders in this emerging field. The research objectives will be addressed through the following interrelated tasks: (i) determining the effect of molecular structure and molecular packing characteristics on the mechanical behavior of conjugated polymer films, (ii) establishing the impact of multi-component polymer blend morphology on electrical and mechanical response, (iii) characterizing interfacial features in heterogeneous films, such that delamination and cohesive failure modes can be mitigated, (iv) determining the features that drive performance variation and degradation under sub-critical mechanical loading under various loading protocols and environmental conditions, and (v) developing standardized mechanical test methods for flexible electronics. A focus will be on organic thin film transistors and organic photovoltaic devices that capture unique and fundamental operating characteristics so that the research products may be extrapolated across broad device platforms. Mechanical properties of interest include film stiffness, ductility, fracture strength, and cohesive and adhesive fracture energy that will be measured using four-point bending, double cantilever beam testing, and buckling metrology methods. The intellectual merit of the proposed research is found in the development of a fundamental framework relating polymer semiconductor structure to mechanical and optoelectronic characteristics enabling mechanically robust layered organic and organic-inorganic systems.

这项教师早期职业发展（职业）的目的是提高对有机（聚合物）半导体膜机械行为的理解。洞悉机械性能和电气性能之间的关系将提供指南，以实现机械稳健的柔性电子设备，例如可穿戴电子设备和低成本太阳能。有机半导体对于柔性电子设备特别有希望，因为它们的分子结构相对符合性质。使用的机械故障主要是由于反复的弯曲，这阻碍了有机膜用于柔性电子应用的商业采用。该奖项为研究分子结构，薄膜微观结构和设备设计对挠曲设备的性能变化和故障模式的影响提供了支持。研究还将包括循环弯曲的作用和环境因素（例如水分对机械稳定性）的作用。这项研究跨越了多个学科，包括材料机制，材料处理和半导体设备物理学，并将为学生提供刺激性的培训环境。教育计划包括开发新兴薄膜电子产品制造和机制的证书计划，以培训这个新兴领域的未来领导者。研究目标将通过以下相互关联的任务来解决：（i）确定分子结构和分子填料特征对共轭聚合物膜的机械行为的影响，（ii）确定多组分聚合物混合形态对电气和电气混合形态的影响机械响应，（iii）表征异质膜中的界面特征，使得可以减轻分层和粘性故障模式，（iv）确定在各种载荷方案和环境条件下，在亚临界机械载荷下驱动性能变化和退化的特征， （v）开发用于柔性电子设备的标准机械测试方法。将重点放在有机薄膜晶体管和有机光伏设备上，这些设备可以捕获独特而基本的操作特性，以便可以在广泛的设备平台上推断研究产品。感兴趣的机械性能包括膜刚度，延展性，断裂强度以及粘性和粘合性断裂能，这些能量将使用四分弯曲，双悬臂束测试和屈曲计量方法来测量。拟议研究的智力优点是在将聚合物半导体结构与机械和光电特性相关的基本框架的开发中找到的，从而实现了机械稳健的分层有机和有机无机系统。