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电子和/或光学性质的聚合物和分子薄膜。这些特性在光电电池、晶体管和发光二极管（现已成为商业产品）等器件中得到了利用。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都依赖于对设备功能基本属性的理解。几乎总是，我们感兴趣的性质取决于发生在薄膜内部和材料界面的输运过程。我的研究计划的长期目标是了解和控制有机光电材料的输运过程。从物理化学的角度看待问题，注重基础科学问题，有利于建立长期影响和培养高素质人才。将传输现象与薄膜结构（包括分子和形态）联系起来的研究将永久地为材料合成和器件社区提供创建高性能系统的一般策略，并训练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测量的定量方面与定性，分子水平的细节光谱学提供。第二个实验重点是先进的样品制备技术的发展；材料的功能受样品形貌的强烈影响。我们将开发一种利用超临界流体的新型沉积方法，这种方法目前在有机光电材料研究中尚未得到充分利用。材料加工和性能测量之间的反馈可以确定和开发最有前途的方向。***本提案的近期目标集中在有机光电材料中电荷、离子和热量的传输。这些目标是：(1)利用原位红外光谱研究电解质门控有机晶体管中的离子和电子电导率；(2)用非线性光学时间解析有机半金属中的热电效应；(3)发展超临界流体激光诱导沉积到有序有机薄膜上。这些项目旨在解决具有长期影响的基础科学问题，并促进对帮助加拿大在这一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.**