Dissociating the Carbon Nanotube Exciton in Organic- and Inorganic- Semiconductor Blends

解离有机和无机半导体混合物中的碳纳米管激子

• 批准号: 0905861
• 负责人: Michael Arnold
• 金额: $ 33.76万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0905861&HistoricalAwards=false
• 关键词: Dissociating; Carbon; Nanotube; Exciton; Organic

Technical: This project addresses the potential of CNT/polymer/inorganic composite materials for efficient photovoltaic operation. The approach includes: synthesis of blends of semiconducting carbon nanotubes with organic and inorganic semiconductors using wet chemical and solution-based blending techniques; characterization of the internal morphology of these blends as a function of processing conditions and materials selection; identification of composite materials that will form a type II (donor/acceptor) heterojunction with semiconducting carbon nanotubes; studies to determine mechanisms responsible for exciton dissociation and charge collection in carbon nanotube/semiconductor blends; quantification of rates for exciton dissociation, charge separation, and charge recombination in the blends; and, quantification of the electron affinity and ionization potential of monodisperse semiconducting carbon nanotubes. It is expected that photogenerated charge carriers in carbon nanotubes can be dissociated and collected by synthesizing donor/acceptor blends of semiconducting carbon nanotubes with more or less electronegative semiconductors. Emphasis is placed on understanding the interrelationship between synthesis, processing, composition, morphology, and properties of such blends. A variety of semiconductors will be investigated to complement the carbon nanotubes in the blends including fullerene-derivatives, semiconducting polymers, and semiconductor oxides. The morphology of the blends will be characterized via scanning probe and electron microscopy as a function of the processing conditions and materials selections. Electronic transport, photoluminescence quenching, spectrally resolved photocurrent, and transient photo-induced absorption measurements will be used to assess the optoelectronic properties of these materials. Non-Technical: The project addresses basic research issues in a topical area of materials science having high technological relevance. The research will contribute basic materials science knowledge at a fundamental level to new understanding and capabilities for materials combinations with potential for improvements in conversion of solar power to electricity. The scientific investigations will also train students; in addition to supporting one graduate student, the project will promote teaching, training, and learning through the integration of undergraduate students into a research setting. The project also provides support for two summer students in the PI?s laboratory through UW-Madison's SURE/REU (Summer Undergraduate Research Experience and Research Experience for Undergraduates) program. The SURE/REU program primarily supports students in under-represented groups. Additionally, the project supports a UW-Madison undergraduate student for the academic year. Topics such as ethics, how to do research efficiently, problem solving, networking, research safety, experimental procedure, and results presentation will be integrated with day-to-day laboratory training.

技术：该项目致力于碳纳米管/聚合物/无机复合材料在高效光伏运行方面的潜力。该方法包括：使用湿化学和基于溶液的混合技术合成半导体碳纳米管与有机和无机半导体的共混物；表征作为工艺条件和材料选择的这些共混物的内部形态；识别将与半导体碳纳米管形成第二类(施主/受主)异质结的复合材料；研究确定碳纳米管/半导体混合物中激子解离和电荷收集的机制；量化激子解离、电荷分离和电荷复合的速率；以及量化单分散半导体碳纳米管的电子亲和力和电离电位。通过将半导体碳纳米管与或多或少的电负性半导体合成施主/受主共混物，碳纳米管中的光生载流子有望被解离和收集。重点了解这类共混物的合成、加工、组成、形态和性能之间的相互关系。将研究多种半导体来补充混合物中的碳纳米管，包括富勒烯衍生物、半导体聚合物和半导体氧化物。共混物的形态将通过扫描探针和电子显微镜来表征，这是工艺条件和材料选择的函数。电子输运、光致发光猝灭、光谱分辨光电流和瞬时光致吸收测量将被用来评估这些材料的光电性质。非技术性：该项目解决具有高度技术相关性的材料科学专题领域的基础研究问题。这项研究将在基础水平上为材料组合的新理解和能力贡献基础材料科学知识，这些材料组合具有改进太阳能发电转换的潜力。科学调查还将培养学生；除了支持一名研究生外，该项目还将通过将本科生融入研究环境来促进教学、培训和学习。该项目还通过威斯康星大学麦迪逊分校的SURE/REU(暑期本科生研究体验和本科生研究体验)计划，为皮？S实验室的两名暑期学生提供支持。Sure/REU计划主要支持代表人数不足的群体的学生。此外，该项目还为威斯康星大学麦迪逊分校的一名本科生提供学年资助。诸如伦理、如何有效地进行研究、解决问题、联网、研究安全、实验程序和结果展示等主题将与日常实验室培训相结合。