有机光电器件界面分子取向调控与光电转换特性研究

项目名称： 有机光电器件界面分子取向调控与光电转换特性研究

项目编号： No.11474214

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 唐建新

作者单位： 苏州大学

项目金额： 96万元

中文摘要： 有机光电器件中有机共轭分子结构的非对称性导致局域电子态和光电特性的各向异性，但界面分子取向对器件光电转换过程的影响规律尚缺乏深入认识，严重制约了有机光电器件的进一步发展。本项目将充分利用已有研究基础，以有机光电器件界面分子取向调控研究为着眼点，从器件物理与结构设计角度进行深入系统的研究。以原位光电子能谱、同步辐射X射线吸收谱等表界面技术为重要研究手段，重点研究有机光伏电池关键界面分子取向的控制及其对局域电子态和光电转换过程的影响，探索分子取向与光学耦合、能量传递、激子分离、电荷转移过程的构效关系及功能调控的物理机制，发展基于分子取向控制的光电转换调控新方法，获取高效有机光伏电池，实现转换效率的进一步提升，力争在有机光电器件所涉及器件结构、工作机理、加工工艺等关键物理与技术问题上有所突破，为促进有机光电器件的实际应用提供理论和技术指导。

中文关键词： 有机光电器件；分子取向；光学耦合；光电转换；界面调控

英文摘要： Organic conjugated semiconductors have been attracting an amount of interests for their opto-electronic properties over the last two decades and are currently exploited in a large range of applications such as light-emitting diodes, photovoltaic devices, or sensors. Albeit organic-based devices have already penetrated into the market, especially in the field of flat-panel displays, solid-state lighting and renewable energy sources, intense research efforts are still carried out at both the academic and industrial level in order to better understand the key electronic processes governing the operation and performance of the devices and provide new guidelines for material design and device architecture. Organic conjugated semiconductors are composed of planar or linear molecules bound by weak intermolecular interactions, and each molecule has specific characteristics as a single molecule, such as electronic structures, absorption and emission spectra due to the molecular anisotropy in geometry. Since it is the microscopic view of chemistry that supports the device physics in organic semiconductors, the detailed investigation of molecular states such as molecular orientation and ordering, interfacial electronic structures and energy level alignment is very important for explaining the relationship between the chemical characteristics of single molecules and the physical properties of organic optoelectronic devices. As a result, controlling the molecular orientation offers a feasible way to modifying the interface energetics and thus energy transfer process at organic interfaces of organic optoelectronics. This will help build reliable fundamentals of organic devices for the further improvement of their improvement. In this project, we aim to elucidate the physical basis of the correlation between molecular orientation and electronic structures at the organic interfaces used in organic optoelectronics, focusing on the influence of molecular orientations on the interfacial energetics and the photovoltaic conversion. In particular, we will provide physical insights for exploring new structures on optical coupling, energy transfer and charge transport process for organic photovoltaic cells through the pathway of molecular orientation-dependent energy level alignment. We will make high efficiency organic photovoltaic devices based on molecular orientation engineering. We expect this project will provide not only a detailed understanding of the impact of molecular orientation in organic devices, but also a new degree of freedom in device design and fabrication.

英文关键词： Organic optoelectronics;Molecular orientation;Optical coupling;Photovoltaic conversion;Interface engineering