One-dimensional hybrid nanostructure arrays from pi-conjugated organic small molecules and inorganic semiconductors for use in excitonic devices

用于激子器件的π共轭有机小分子和无机半导体的一维混合纳米结构阵列

• 批准号: 385970-2010
• 负责人: Shankar, Karthik
• 金额: $ 3.28万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=485149
• 关键词: dimensional; hybrid; nanostructure; arrays; pi

The major themes of this research program are the growth, characterization and device applications of organized 'hybrid' one-dimensional (1-D) nanostructures composed of both organic and inorganic semiconductors. 1-D semiconductor architectures such as nanotubes (NTs) and nanowires (NWs) exhibit unique nanoscale phenomena (not normally observed in the bulk) which originate in orientation anisotropy and size confinement effects. They have also been demonstrated to achieve enhancement of bulk properties. Due to these characteristics, they can be used to design unconventional material and device configurations and hold the promise of overcoming difficult obstacles in the fields of photovoltaics and photonics. One such obstacle in the area of photonics is the small value of the third order non-linear susceptibility (chi3) in most conventional materials, which is currently impeding progress in the areas of real-time holography and all-optical switching. Another obstacle is in the area of low cost excitonic solar cells where achievement of higher energy conversion efficiencies is impeded by the exciton diffusion bottleneck. Hybrid organized nanostructures have the potential to dramatically improve the performance of excitonic devices and overcome the obstacles mentioned above. Therefore, we propose to exploit the unique properties and architecture of 1-D hybrid nanostructures to obtain superior performance in excitonic devices. A distinguishing feature of our approach is that we aim to create not nanocomposites, but oriented and aligned 1-D hybrid NT/NW arrays. We also note that there are hundreds of reports each on carbon nanotubes, gold nanowires, titanium dioxide nanotubes, silicon nanowires, etc. In contrast, pi-conjugated organic nanotube and nanorod arrays have received little attention and constitute a frontier area of research. A key component of our research program is the comprehensive study of crystalline nanotube and nanorod arrays made from small-molecule pi-conjugated systems. Another component is the advancement of excitonics, the science and technology of manipulating electrostatically bound excited states in pi-conjugated organic semiconductors and nanostructured inorganic semiconductors.

该研究计划的主要主题是由有机和无机半导体组成的有组织的“混合”一维（1-D）纳米结构的增长，表征和设备应用。 1-D半导体体系结构，例如纳米管（NTS）和纳米线（NWS）表现出独特的纳米级现象（通常在大容量中不观察到），这些现象起源于方向各向异性和大小限制效应。 还已证明它们可以增强批量性能。 由于这些特征，它们可用于设计非常规的材料和设备配置，并具有克服光伏和光子学领域困难障碍的希望。光子学区域中的一个这样的障碍是在大多数常规材料中的三阶非线性敏感性（CHI3）的小价值，这目前阻碍了实时全息和全光开关领域的进展。 另一个障碍是在低成本的激子太阳能电池区域，在激子扩散瓶颈会阻碍较高能量转化效率的实现。 混合有组织的纳米结构有可能显着改善激子设备的性能并克服上述障碍。 因此，我们建议利用1-D混合纳米结构的独特属性和体系结构，以在激子设备中获得卓越的性能。我们方法的一个显着特征是，我们旨在创建纳米复合材料，而是定向和对齐的1-D混合NT/NW数组。 我们还注意到，在碳纳米管，金纳米线，二氧化钛纳米管，硅纳米线等方面都有数百个报告，相反，PI结合的有机纳米管和纳米棒阵列很少受到关注，并且构成了研究的领域。我们研究计划的一个关键组成部分是对由小分子PI偶联系统制成的结晶纳米管和纳米棒阵列的全面研究。另一个组成部分是激发学的发展，即在PI结合的有机半导体和纳米结构的无机半导体中操纵静电绑定的激发态的科学和技术。