Eager: Tuning Performance in Perovskite Thermoelectric Devices with Organic Radical Dopants

Eager：利用有机自由基掺杂剂调节钙钛矿热电器件的性能

• 批准号: 1939986
• 负责人: Letian Dou
• 金额: $ 11.63万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1939986&HistoricalAwards=false
• 关键词: Eager; Tuning; Performance; Perovskite; Thermoelectric

Nontechnical:Thermoelectric devices hold great promise for the future energy landscape. They convert waste heat into usable electricity and can provide on demand cooling or heating. Despite their potential, the low efficiency of thermoelectric devices has limited their adoption. Advances in the properties of materials used in thermoelectric devices are needed to make this promising technology a reality. The PIs will investigate a new family of materials for thermoelectric applications: hybrid metal halide perovskites with organic and inorganic components. Students will receive training in materials science and engineering. This project will impact the materials science and electronics communities and inspire future scientists and engineers dedicated to sustainable energy solutions.Technical:Hybrid metal halide perovskites are low-thermal conductivity materials with clear benefits in practical, solution-processed thermoelectric devices from a performance and cost basis. Yet, little effort has been placed in fabricating thermoelectric devices from perovskite systems. This lack of study and implementation is mainly due to the key challenge in finding a means by which to effectively control the charge carrier concentration and electrical conductivity of the devices through straightforward doping strategies. The conventional approach to doping that is focused on atomic substitution in the lattice does not work for halide perovskites due to charge screening and the defect-tolerant nature of typical perovskite systems. Therefore, a shift in archetype regarding doping in perovskite devices must be had in order to overcome this key challenge. This critical opportunity will be addressed by incorporating radical-containing ligands into the actual perovskite crystal lattice in order to serve as intramolecular dopants for the thermoelectric devices. This project is based on the PIs' prior work in manipulating the optoelectronic properties of perovskite-based devices by incorporating closed-shell organic ligands into the crystal structures of the materials and previous success of using radical-based dopants to enhance the performance of polymer thermoelectric devices. Inclusion of these radical dopants will allow for the ready tuning of the carrier concentrations and electrical and thermal conductivities associated with the semiconducting materials through intramolecular means. This project will enable manipulation of the key structure-property-performance relationships in a novel class of printed electronic materials, and in doing so, demonstrate high-performance devices.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术性：热电设备对未来的能源前景充满希望。它们将废热转化为可用的电力，并可按需提供制冷或供暖。尽管它们具有潜力，但热电装置的低效率限制了它们的采用。热电器件中使用的材料的性能的进步需要使这一有前途的技术成为现实。PI将研究用于热电应用的新材料家族：具有有机和无机成分的混合金属卤化物钙钛矿。学生将接受材料科学和工程方面的培训。该项目将影响材料科学和电子领域，并激励未来致力于可持续能源解决方案的科学家和工程师。技术：混合金属卤化物钙钛矿是一种低热导率材料，从性能和成本的角度来看，在实用的溶液处理热电器件中具有明显的优势。然而，在从钙钛矿系统制造热电器件方面几乎没有付出努力。这种缺乏研究和实施的主要原因是，在寻找一种方法，通过直接的掺杂策略，有效地控制电荷载流子浓度和器件的电导率的关键挑战。由于电荷屏蔽和典型钙钛矿体系的缺陷耐受性质，专注于晶格中原子取代的常规掺杂方法对卤化物钙钛矿不起作用。因此，为了克服这一关键挑战，必须改变钙钛矿器件中掺杂的原型。这个关键的机会将通过将含自由基的配体结合到实际的钙钛矿晶格中来解决，以便作为热电器件的分子内掺杂剂。该项目是基于PI之前通过将闭壳有机配体纳入材料的晶体结构来操纵钙钛矿基器件的光电性能的工作，以及之前使用基于自由基的掺杂剂来提高聚合物热电器件性能的成功。包含这些自由基掺杂剂将允许通过分子内手段容易地调节与半导体材料相关的载流子浓度以及电导率和热导率。该项目将使操纵的关键结构-属性-性能的关系，在一个新的类别的印刷电子材料，并在这样做，展示高性能的设备。该奖项反映了NSF的法定使命，并已被认为是值得的支持，通过评估使用基金会的知识价值和更广泛的影响审查标准。

项目成果

Two-dimensional halide perovskite lateral epitaxial heterostructures

二维卤化物钙钛矿横向外延异质结构

• DOI: 10.1038/s41586-020-2219-7
• 发表时间: 2020-04-01
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Shi, Enzheng;Yuan, Biao;Dou, Letian
• 通讯作者: Dou, Letian