Lithographically defined nano-morphology in polymer-fullerene solar cells towards high efficiency

光刻定义聚合物富勒烯太阳能电池的纳米形态以实现高效率

• 批准号: 0901759
• 负责人: Walter Hu
• 金额: $ 32.93万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-05-15 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0901759&HistoricalAwards=false
• 关键词: Lithographically; defined; nano; morphology; polymer

The objective of this research is to develop an optimal morphology of vertically bi-continuous donor and acceptor materials interpenetrating into each other to achieve high efficiency in organic solar cells. This morphology decouples absorption depth from diffusion length, allowing effective exciton diffusion to large interfacial areas as well as vertical charge transport with reduced recombination. Intellectual merit: The proposed nanoimprint lithography with innovative mold technologies provides a practical means with greater precision than currently available techniques to make an optimal solar cell design. The thermal imprinting process can also induce favorable polymer chain alignment and crystallization, leading to higher hole mobility and light absorption. By decoupling absorption depth from diffusion length, a thicker polymer film than in conventional bulk heterojunction devices can be used to enhance light adsorption considerably. This morphology provides a basic nano-platform to study the interrelated polymer properties (crystallinity, mobility, chain orientation, stability, thermal dynamic properties, etc) and their correlation with geometry, imprint temperature, surface effects, and device quantum efficiency. Broader impacts: This study will establish a comprehensive understanding of the effects of heterojunction nano-morphology on material properties and device characteristics, which is transformative to other materials and devices. What may naturally follow is the demonstration of 7-12% PCE in polymer solar cells. This research will be integrated with education through available programs at UTD to provide research opportunities for students. Particularly, this program aims to bring greater nanotechnology exposure to a broad range of individuals including undergraduates and the education community on the whole.

本研究的目的是开发一种最佳形态的垂直双连续的供体和受体材料相互渗透，以实现高效率的有机太阳能电池。 这种形态从扩散长度的吸收深度，允许有效的激子扩散到大的界面区域，以及垂直电荷传输减少复合。智力优点：所提出的具有创新模具技术的纳米压印光刻提供了比当前可用技术具有更高精度的实用手段来进行最佳太阳能电池设计。热压印工艺还可以诱导有利的聚合物链排列和结晶，导致更高的空穴迁移率和光吸收。通过将吸收深度与扩散长度解耦，可以使用比常规体异质结器件中更厚的聚合物膜来显著增强光吸收。这种形态学提供了一个基本的纳米平台，以研究相关的聚合物性质（结晶度，流动性，链取向，稳定性，热动力学性质等）和它们与几何形状，压印温度，表面效应和设备量子效率的相关性。更广泛的影响：这项研究将建立异质结纳米形态对材料性能和器件特性的影响的全面理解，这对其他材料和器件具有变革性。接下来自然会展示聚合物太阳能电池中7-12%的PCE。这项研究将通过UTD现有的课程与教育相结合，为学生提供研究机会。特别是，该计划旨在为包括本科生和整个教育界在内的广泛的个人带来更大的纳米技术接触。