CAREER: Understanding Morphology-Property Correlations in Conjugated Polymer Blends with Nanoscale Optoelectronic Probes

职业：利用纳米级光电探针了解共轭聚合物共混物的形态-性能相关性

• 批准号: 0449422
• 负责人: David Ginger
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0449422&HistoricalAwards=false
• 关键词: CAREER; Understanding; Morphology; Property; Correlations

The scientific goal of this CAREER project is to understand how local phase-separated morphology impacts charge transport, separation, recombination and injection in conjugated polymer blends. The approach involves novel combinations of electrical scanning-probe microscopy with optical excitation and single-molecule optical spectroscopy. Kinetic and thermodynamic phenomena governing phase separation in solution-processed conjugated polymer thin films will be addressed. Immediate attention will be given to processing, characterization, and device performance in blends of semiconducting polymers. Several themes will be initiated including: 1)deconvoluting charge generation and charge transport in nanostructured, photoconductive donor/acceptor blends by making spatially, spectrally, and time resolved charge generation and collection maps with scanning probes; 2)understanding local variations in charge recombination, emission, photochemistry, and exciton-carrier coupling by studying the electroluminescence from both single dopant molecules and nanoscale domains in polymer blends; 3)making high resolution lateral and vertical maps of charge injection and electric field distribution in multi-phase systems as a function of phase composition and polymer conformation at interfaces; 4)mapping the kinetic and thermodynamic governing phase separation in conjugated polymer blends in order to optimize processing into desired morphologies using nanopatterned surface chemistry. Microscopic models will be developed relevant to observed electronic properties as a function of local film structure to assist prediction of which morphologies will meet desired materials performance goals. Predictions will be tested against actual device measurements on films processed to yield the chosen morphology. These studies will be enhanced by close collaboration with both synthetic polymer chemists, and with theorists specializing in electronic structure in complex con-densed-phase systems. %%% The project addresses fundamental research issues in electronic/photonic materials science having technological relevance. The project is interdisciplinary involving the intersection of chemistry, physics, and materials science, and has direct technological applications in photovoltaics and electroluminescent displays--areas readily appreciated by students and the general public. The project will be leveraged to advance major educational goals: to improve undergraduate education through the development and incorporation of computer-based, context-rich problems into the physical chemistry curriculum at the University of Washington; and, to improve graduate education through the establishment of a formal graduate program that will teach verbal commu-nication skills while simultaneously serving outreach efforts targeting underrepresented K-12 groups. The integrated research and teaching activities will lay the foundation for a long-term integrated scientific and educational program that will last beyond the award period.***

该职业项目的科学目标是了解当地分离的形态如何影响指控运输，分离，重组和共轭聚合物混合物的注射。该方法涉及电扫描探针显微镜与光激发和单分子光谱的新型组合。在溶液加工的共轭聚合物薄膜中控制相分离的动力学现象将被解决。在半导体聚合物的混合物中，将立即注意处理，表征和设备性能。将启动几个主题，包括：1）通过空间，光谱，频谱和时间解析的电荷产生和收集图的纳米结构，光电导向供体/受体混合物中的反电荷产生和电荷传输； 2）通过研究聚合物混合物中的单掺杂分子和纳米级域的电致发光，了解电荷重组，发射，光化学和激子载体耦合的局部变化； 3）在多相系统中制作高分辨率的横向和垂直图，并在界面处的相组成和聚合物构象的函数； 4）在共轭聚合物混合物中绘制动力学和热力学的管状分离，以便使用纳米图案的表面化学将加工为所需的形态进行优化。微观模型将与观察到的电子特性作为本地膜结构的函数相关，以帮助预测形态将符合所需的材料性能目标。预测将在处理所选形态的薄膜上进行实际设备测量。这些研究将通过与合成聚合物化学家的密切合作以及专门从事复杂的互助相系统中的电子结构的理论家的密切合作来增强这些研究。 %%％该项目解决了具有技术相关性的电子/光子材料科学领域的基本研究问题。该项目是跨学科的，涉及化学，物理和材料科学的交集，并且在光伏和电致发光显示器中具有直接的技术应用 - 很容易受到学生和公众的赞赏。该项目将被利用以促进主要的教育目标：通过开发和纳入华盛顿大学的物理化学课程中，改善本科教育；并且，通过建立正式的研究生课程来改善研究生教育，该课程将教授口头交流技能，同时为针对代表性不足的K-12小组的外展工作提供服务。综合研究和教学活动将为一项长期综合科学和教育计划奠定基础，该计划将持续到奖励期。***