Collaborative Research: Hybrid Organic-Inorganic Thermoelectric Materials

合作研究：有机-无机杂化热电材料

• 批准号: 1361896
• 负责人: Zhiqun Lin
• 金额: $ 15万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-15 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1361896&HistoricalAwards=false
• 关键词: Collaborative; Research; Hybrid; Organic; Inorganic

Proposal 1400246Collaborative Research: Hybrid organic-inorganic thermoelectric materialsAbstract: Thermoelectric materials are materials which can be used to convert thermal energy directly to electricity. The performance of a thermoelectric material is measured by the "figure of merit", termed ZT. There has been much research into increasing thermoelectric materials, figure of merit, however, progress in this area has been slow and most of the researched thermoelectric materials up to now are suffering from either high fabrication cost, usage of rare earth or toxic elements, or poor mechanical properties. Organic thermoelectric materials (OTEs) have recently attracted attention for low temperature applications ( 300K), especially cooling purposes, as they are flexible, low-cost and abundant, and low-cost fabrication methods for synthesizing them exist. However, the ZT of the state-of-the-art OTEs is significantly lower than the ZT of their inorganic counterparts. In fact, there are only few candidates for low temperature thermoelectric devices even among inorganic materials. In the case of inorganic thermoelectric materials, the limiting factor in improving ZT is the electron mobility. This work will allow for the fabrication of high-ZT thermoelectric materials by addressing the challenges in mobility enhancement. This will be done by combining the two classes of materials (organic and inorganic), using a fabrication scheme in which high-mobility inorganic nanowires are embedded inside organic compounds. The researchers are a multidisciplinary team with complementary expertise and with common interest in the thermoelectric field. Graduate and Undergraduate Students involved in this project therefore will benefit largely from the multidisciplinary nature of the work.This work is applying new doping schemes (3D modulation-doping and field-effect doping) to hybrid organic-inorganic materials and to simulate, design, fabricate and characterize a new class of low temperature thermoelectric nanocomposites. The two-phase material uses the organic phase (e.g. conjugated-polymer or organic molecules) as a source of electrons and the inorganic semiconducting phase (e.g. Si nanowires) as the electron transport channel with high mobility. The key is to use the modulation-doping scheme to favor carrier transfer from the source of carriers (e.g. conjugated-polymer) to the high mobility inorganic semiconducting phase (inorganic nanowires) and optimize the carrier concentration to design a high Z hybrid thermoelectric material. A large class of semiconducting nanostructures (e.g. Si, CdTe, Bi, and PbTe nanowires and holely structures) combined with conjugated polymers (e.g., chemically-modified PEDOT and low bandgap polymers) and organic molecules (specifically charged chemical species attached to molecules such as CF3- substituted styrene molecules) will be simulated, synthesized and optimized to identify new hybrid materials with a potentially high ZT.

提案1400246策略研究：混合有机无机热电材料摘要：热电材料是可用于将热能直接转换为电能的材料。热电材料的性能通过称为ZT的“优异数字”来测量。对于增加热电材料的增加，优点的数字已经进行了很多研究，但是，这一领域的进展一直很缓慢，到目前为止，大多数研究的热电材料迄今为止都遭受了高度制造成本，稀土或有毒元素的使用或有毒元素的使用，或机械性能差。有机热电材料（OTE）最近引起了人们对低温应用（300K）的关注，尤其是冷却目的，因为它们具有柔性，低成本和丰富的且低成本的制造方法，以合成它们。但是，最先进的OTE的ZT明显低于其无机同行的ZT。实际上，即使在无机材料中，低温热电设备也只有很少的候选者。在无机热电材料的情况下，改善ZT的限制因素是电子迁移率。这项工作将通过解决移动性增强的挑战来制造高ZT热电材料。这将通过使用制造方案结合两类材料（有机和无机）来完成，其中高动力无机纳米线嵌入了有机化合物中。研究人员是一支具有互补专业知识的多学科团队，对热电领域具有共同的兴趣。因此，参与该项目的研究生和本科生将在很大程度上受益于工作的多学科性质。这项工作正在应用新的兴奋剂方案（3D调制兴奋剂和现场效应掺杂），以模拟有机材料，并模拟，设计，设计，设计，设计，设计，设计制造并表征一类新的低温热电纳米复合材料。两相材料将有机相（例如共轭聚合物或有机分子）用作电子的来源，而无机半导体阶段（例如SI纳米线）作为具有高迁移率的电子传输通道。关键是使用调制兴奋剂方案有利于从载流子（例如共轭聚合物）到高迁移率无机半导体阶段（无机纳米线）的载体转移，并优化载体浓度以设计高Z混合热热电力材料。一大类的半导体纳米结构（例如Si，CdTe，Bi和Pbte纳米线和度型结构和巨大结构）与共轭聚合物（例如化学修饰的PEDOT和低跨度聚合物）和有机分子（特定电荷的化学物种）结合在一起CF3-取代的苯乙烯分子将进行模拟，合成和优化，以鉴定具有潜在的ZT高ZT的新杂种材料。