Transport Phenomena in Organic Optoelectronic Materials

有机光电材料领域广泛涉及开发和理解具有有用的电子和/或光学性能的聚合物和分子薄膜。这些特性被用于光伏电池、晶体管和发光二极管(现在是一种商业产品)等设备中。这类材料的持续成功取决于现有应用的新材料的开发和全新应用的发现。这两个目标在很大程度上依赖于对设备功能的基本属性的了解。几乎总是，感兴趣的性质取决于在薄膜内和材料界面处发生的传输过程。*我的研究计划的长期目标是了解和控制有机光电材料的传输过程。从物理化学的角度来看待这个问题，着眼于基础科学问题，有助于建立长效机制，培养高素质的人才。将输运现象与薄膜结构(分子和形态)联系起来的研究将永久地向材料合成和设备社区提供有关创建高性能系统的一般策略的信息，并培训学生使用物理洞察力来开发材料技术。研究小组将开发创新的实验方法，通常结合电学和光谱测量。这种方法的一个好处是同时利用电学测量的定量方面和光谱学提供的定性、分子水平的细节。第二个实验重点是发展先进的样品制备技术；材料功能受到样品形态的强烈影响。我们将开发一种新的沉积方法，使用目前在有机光电材料研究中未得到充分利用的超临界流体。材料加工和性能测量之间的反馈使最有希望的方向得以确定和发展。*这项建议的近期目标集中在有机光电材料中的电荷、离子和热的传输。这些目标是：(1)用原位红外光谱研究电解液门控有机晶体管中的离子和电子电导；(2)用非线性光学方法解决有机半金属中的热电效应；(3)发展超临界流体中的激光诱导沉积，形成图案有序的有机薄膜。选择这些项目是为了解决具有长期影响的基本科学问题，并促进对帮助加拿大在这项新兴技术中发挥领导作用至关重要的创新。**

The field of organic optoelectronic materials is broadly concerned with developing and understanding polymeric and molecular films with useful electronic and/or optical properties. These properties are exploited in devices such as photovoltaic cells, transistors and light emitting diodes (now a commercial product). The continued success of this class of materials depends upon the development of new materials for existing applications and the discovery of entirely new applications. Both goals rely heavily on understanding the fundamental properties responsible for device function. Almost always, the properties of interest depend on transport processes that occur both within the film and at material interfaces. *** The long-term goal of my research program is to understand and control transport processes in organic optoelectronic materials. Approaching the problem from the perspective of physical chemistry and focusing on basic scientific questions is useful in establishing long-term impact and training highly qualified personnel. Research connecting transport phenomena to film structure (both molecular and morphological) will permanently inform the materials synthesis and device community on general strategies for creating high performing systems and train students to use physical insight to develop materials technology. *** The research group will develop innovative experimental methods, often combining electrical and spectroscopic measurements. A benefit of this approach is to simultaneously leverage the quantitative aspects of electrical measurements with the qualitative, molecular-level details spectroscopy provides. A second experimental emphasis is the development of advanced sample preparation techniques; material function is strongly influenced by sample morphology. We will develop a novel deposition method using supercritical fluids, which are currently underutilized in organic optoelectronic materials research. Feedback between materials processing and property measurements allows the most promising directions to be identified and developed.*** The near-term objectives of this proposal are focused on the transport of charges, ions, and heat in organic optoelectronic materials. These objectives are: (1) Investigate ionic and electronic conductivity in electrolyte gated organic transistors using in-situ infrared spectroscopy, (2) Time resolve the thermoelectric effect in organic semi-metals with nonlinear optics and (3) Develop laser induced deposition from supercritical fluids to pattern ordered organic films. These projects were chosen to address basic scientific questions with long-term impact and to catalyze innovations critical to helping Canada to take a leadership role in this emerging technology.**