Charge Photogeneration and Recombination in Organic Semiconductors

有机半导体中的电荷光生和复合

• 批准号: 0309444
• 负责人: Lewis Rothberg
• 金额: $ 34.92万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309444&HistoricalAwards=false
• 关键词: Charge; Photogeneration; Recombination; Organic; Semiconductors

The goal of this project is to gain fundamental understanding of charge photogeneration and recombination in organic semiconductors. The approach is to use fresh experimental approaches designed to answer basic questions and to provide mechanistic insight. A time delayed field collection technique will be used to quantify charge generation in conjugated polymers without the ambiguities of photoconductivity or spectroscopic measurements. Theories for the wavelength, field and temperature dependence of charge generation yield will be tested. Transient pump and dump experiments that address the mechanism of charge generation are included. To study recombination, time-gated and thermally stimulated luminescence will be used to interrogate recombination of photogenerated charges that have lost spin correlation. This approach makes the results relevant to electroluminescent devices but is free from the difficulties of quenching at contacts and freezeout of transport at low temperature. %%% An important impact of the project is in education and human resource development through the integration of research and education. The project involves graduate and undergraduate students, including visiting summer students from a minority serving institution, CCNY, with undergraduates doing senior theses taking part in our research. The PI is also active in outreach activities hosting high school students to do research. Participants at all levels will present their work orally and in writing as a part of their experience and to disseminate knowledge obtained in the research. The PI and students also interact with several retired and active industrial colleagues who participate in group research. Their input assists connections to technologically relevant issues where basic research can have important impact. One such thrust is to improve understanding of charge photogeneration in conjugated polymers as it pertains to development of solar cells and photovoltaics based on organic materials. A similar goal is to identify the states resulting from recombination of charges with uncorrelated spins as it pertains to selection of materials for polymer LEDs.***

本计画的目标是获得有机半导体中电荷光生与复合的基本了解。该方法是使用新的实验方法，旨在回答基本问题，并提供机械的见解。时间延迟场收集技术将被用来量化共轭聚合物中的电荷产生，而没有光电导或光谱测量的模糊性。理论的波长，字段和温度依赖性的电荷产生产量将进行测试。瞬态泵和转储实验，解决机制的电荷产生。为了研究复合，时间门控和热刺激发光将被用来询问已经失去自旋相关的光生电荷的复合。这种方法使相关的结果的电致发光器件，但从淬火的困难，在接触和冻结的运输在低温下。该项目的一个重要影响是通过研究和教育的结合，在教育和人力资源开发方面。该项目涉及研究生和本科生，包括来自少数民族服务机构CCNY的访问暑期学生，本科生做高级论文参加我们的研究。PI还积极开展外联活动，接待高中生进行研究。各级参与者将口头和书面介绍他们的工作，作为他们经验的一部分，并传播在研究中获得的知识。PI和学生还与几位退休和活跃的工业同事互动，他们参加了小组研究。他们的投入有助于与基础研究可能产生重要影响的技术相关问题建立联系。一个这样的推力是提高共轭聚合物中的电荷光生的理解，因为它涉及到基于有机材料的太阳能电池和光生电子学的发展。一个类似的目标是识别电荷与不相关自旋的重组所产生的状态，因为它涉及聚合物LED材料的选择。