Collaborative Research: Thermoelectric transport and carrier dynamics in three-dimensional chalcogenide nanowire networks

合作研究：三维硫族化物纳米线网络中的热电输运和载流子动力学

• 批准号: 1905571
• 负责人: Je-Hyeong Bahk
• 金额: $ 29.16万
• 依托单位: University of Cincinnati Main Campus
• 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: 2019-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905571&HistoricalAwards=false
• 关键词: Collaborative; Research; Thermoelectric; transport; carrier

Nontechnical description: Heat is abundant in the environment, and thus solid-state thermal energy harvesting holds great promises as an alternative power source for wearable electronics and sensors. However, conventional bulk semiconductors are mostly heavy and nonflexible, therefore not readily suitable for these applications. This project explores new material concepts and novel material synthesis techniques based on nanotechnology to create lightweight, flexible, and scalable material systems for efficient thermal energy harvesting. The objective of this project is to understand the fundamental thermal and electrical transport processes in nanowire network-based composites and advance the knowledge of how these underlying physical processes affect the thermal-to-electric energy conversion properties. The project actively promotes education and training of next-generation scientists and engineers, particularly from underrepresented groups, in the interdisciplinary fields that are technologically important and critical for sustained economic vitality of the nation. As direct outcomes of the research activities, online simulation tools are developed for use in courses, as well as for broader audiences.Technical description: This project investigates the fundamental thermoelectric transport physics in three-dimensional chalcogenide nanowire networks. Various thermoelectric chalcogenide nanowires are solution-synthesized and uniformly dispersed in thick flexible matrices such as polydimethylsiloxane to create stable three-dimensional nanowire networks. These nanowire networks provide efficient thermoelectric transport paths for charge carriers in the resulting composite. The impact of carrier tunneling at the junctions between nanowires on the macroscopic thermoelectric properties is extensively studied in this project. The matrices offer stable and uniform dispersion of nanowires, along with their own advantages such as lightweight, low cost, mechanical flexibility, and solution-processability, all in all, making the composites suitable for the development of large-scale flexible thermoelectric materials. In this project, nanowire interfaces are additionally modified with surface-bound organic molecules or particulate conjugated polymers to study their impacts on the transport properties. Heterostructure barrier particles grown at the two ends of the nanowires during the nanowire synthesis are systematically investigated for further enhancement of thermoelectric properties via carrier energy filtering and minority carrier blocking effects. A generalized transport theory including the junction tunneling effects is developed through the project to understand the underlying physics over a broad range of transport regimes, and provide insights for further material advancement.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.

非技术描述：环境中热量丰富，因此固态热能收集作为可穿戴电子产品和传感器的替代电源具有广阔的前景。然而，传统的块状半导体大多很重且不灵活，因此不太适合这些应用。该项目探索基于纳米技术的新材料概念和新颖材料合成技术，以创建轻质、灵活和可扩展的材料系统，以实现高效的热能收集。该项目的目标是了解基于纳米线网络的复合材料中的基本热和电传输过程，并加深对这些基础物理过程如何影响热电能量转换特性的了解。该项目积极促进下一代科学家和工程师的教育和培训，特别是来自代表性不足的群体的跨学科领域的教育和培训，这些领域对国家的持续经济活力具有重要的技术和关键作用。作为研究活动的直接成果，开发了在线模拟工具，供课程中以及更广泛的受众使用。技术描述：该项目研究三维硫族化物纳米线网络中的基本热电输运物理。各种热电硫族化物纳米线通过溶液合成并均匀分散在厚的柔性基质（例如聚二甲基硅氧烷）中，以创建稳定的三维纳米线网络。这些纳米线网络为所得复合材料中的电荷载流子提供了有效的热电传输路径。该项目广泛研究了纳米线之间连接处的载流子隧道效应对宏观热电性能的影响。该基体提供稳定、均匀的纳米线分散，以及其自身的优势，如轻质、低成本、机械灵活性和溶液加工性等，使该复合材料适合开发大规模柔性热电材料。在该项目中，纳米线界面还用表面结合的有机分子或颗粒共轭聚合物进行修饰，以研究它们对传输性能的影响。系统地研究了纳米线合成过程中在纳米线两端生长的异质结构势垒颗粒，以通过载流子能量过滤和少数载流子阻挡效应进一步增强热电性能。通过该项目开发了包括结隧道效应在内的广义输运理论，以了解各种输运机制的基础物理，并为进一步的材料进步提供见解。该奖项反映了 NSF 的法定使命，并通过评估被认为值得支持利用基金会的智力优势和更广泛的影响审查标准。

项目成果

Effects of side-wall air cooling on solar thermoelectric generation with high aspect-ratio, V-shaped P/N couples

侧墙风冷对高深宽比V型P/N电偶太阳能热发电的影响

• DOI: 10.1063/5.0151168
• 发表时间: 2023-06-02
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: Xinjie Li;Thiraj Mohankumar;J. Bahk
• 通讯作者: J. Bahk

Ultra-fast Thermoreflectance Imaging for Electronic, Optoelectronic, and Thermal Devices

适用于电子、光电和热敏设备的超快速热反射成像

• DOI: 10.1109/bcicts45179.2019.8972732
• 发表时间: 2020-01
• 期刊: 2019 IEEE BiCMOS and Compound semiconductor Integrated Circuits and Technology Symposium (BCICTS
• 作者: Bahk, Je;Shakouri, Ali
• 通讯作者: Shakouri, Ali

Cost-Performance Trade-off in thermoelectric air conditioning system with graded and constant material properties

具有分级和恒定材料特性的热电空调系统的成本与性能权衡

• DOI: 10.1016/j.enbuild.2021.110931
• 发表时间: 2020-11-04
• 期刊: arXiv: Applied Physics
• 作者: A. Saini;Sarah J. Watzman;J. Bahk
• 通讯作者: J. Bahk

Performance Optimization and Exergy Analysis of Thermoelectric Heat Recovery System for Gas Turbine Power Plants

燃气轮机热电余热回收系统性能优化及火用分析

• DOI: 10.3390/e25121583
• 发表时间: 2023-11-25
• 期刊: Entropy
• 影响因子: 2.7
• 作者: Ahmad M. Alsaghir;J. Bahk
• 通讯作者: J. Bahk

Boosting Thermoelectric Power Factor of Carbon Nanotube Networks with Excluded Volume by Co-Embedded Microparticles

通过共嵌入微粒提高排除体积碳纳米管网络的热电功率因数

• DOI: 10.1021/acsami.3c09136
• 发表时间: 2023-09
• 期刊: ACS Applied Materials & Interfaces
• 影响因子: 9.5
• 作者: Akinboye, Oluwasegun Isaac;Zhang, Yu;Kondapalli, Vamsi Krishna;Yang, Fan;Mandrolko, Viktor;Isaiev, Mykola;Pernot, Gilles;Shanov, Vesselin;Wu, Yue;Bahk, Je
• 通讯作者: Bahk, Je