Collaborative Research: Thermal Transport via Four-Phonon and Exciton-Phonon Interactions in Layered Electronic and Optoelectronic Materials

合作研究：层状电子和光电材料中四声子和激子-声子相互作用的热传输

• 批准号: 2321302
• 负责人: Li Shi
• 金额: $ 32.83万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2321302&HistoricalAwards=false
• 关键词: Collaborative; Research; Thermal; Transport; via

Semiconductor research and development over the past several decades have enabled widespread use of electronic and optoelectronic devices in society. Among the challenges that the semiconductor industry is facing, it has become increasingly difficult to remove the large density of heat generation and prevent overheating of silicon microchips. As one of the approaches to overcoming this challenge, atomic layered materials are now being actively investigated as next-generation electronic and optoelectronic materials due to their potentially superior electric, optical, and thermal properties compared to those of silicon. Compared to the silicon properties that have been extensively investigated, many properties of these emerging materials have remained to be understood. Heat can be transported by atomic vibration waves in these layered materials and other solids. It is currently unclear how the highly nonlinear interatomic springs influence the heat transfer ability of the atomic vibration in these layered materials. In addition, light illumination on semiconductors can excite electrons to high-energy states that are referred as excitons. There is currently a knowledge gap in the heat-carrying ability of these excitons and their influence on the atomic vibration waves. This project aims to address the outstanding questions on these two specific fundamentals that control the heat transport properties in these layered materials. The obtained knowledge will be used to build new simulation tools, enhance online courses and classroom instruction, and develop hands-on education modules to aid the recruitment and training of a diverse population of next-generation workforce in thermal engineering. The goal of this project is to advance the fundamental understanding of the effects of four-phonon and exciton-phonon interactions in thermal transport and energy dissipation in emerging layered electronic and optoelectronic materials. Specifically, four outstanding questions that are essential for the operation of emerging layered electronic and optoelectronic materials will be addressed: (1) How four-phonon interactions impact the thickness dependence of the lattice thermal conductivity in multi-layered graphene and carbon nanotubes (CNTs); (2) Whether four-phonon interactions reduce or broaden the temperature window of hydrodynamic phonon transport in graphitic materials; (3) Whether exciton diffusion can provide another channel for heat transport from hot spots in layered optoelectronic and electronic materials; and (4) How exciton-phonon coupling influences the lattice thermal transport and local non-equilibrium in emerging TMD devices. These questions will be addressed by new computational models that integrate frontier first-principles theory of exciton-phonon and four-phonon coupling, and unique nanoscale thermal metrology tools including the multi-probe thermal transport and photo-heat current measurements. The obtained fundamental understanding of four-phonon and exciton-phonon interactions helps to establish the foundation for modeling and controlling energy dissipation and thermal transport in emerging layered electronic and optoelectronic 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.

在过去的几十年中，半导体的研究和开发已使社会中的电子和光电设备广泛使用。在半导体行业面临的挑战中，消除较大的热量产生并防止硅微芯片过热变得越来越困难。作为克服这一挑战的方法之一，由于与硅的潜在高电，光学和热性能，原子分层材料现在正在积极研究为下一代电子和光电材料。与已经进行了广泛研究的硅特性相比，这些新兴材料的许多特性尚待理解。热量可以通过这些分层材料和其他固体中的原子振动波传输。目前尚不清楚高度非线性的原子间弹簧如何影响这些分层材料中原子振动的传热能力。此外，半导体上的光照明可以激发电子对被称为激子的高能状态。当前，这些激子的热携带能力及其对原子振动波的影响存在知识差距。该项目旨在解决这两个特定基本面的杰出问题，这些问题控制着这些分层材料中的热传输特性。获得的知识将用于构建新的模拟工具，增强在线课程和课堂教学，并开发动手教育模块，以帮助招募和培训热力工程中的下一代劳动力。 该项目的目的是促进对新兴分层电子和光电材料中的热传输和能量耗散中四频和激子相互作用的影响的基本理解。具体而言，将解决对于新兴分层的电子和光电材料运行至关重要的四个杰出问题：（1）四个phonon相互作用如何影响多层石墨烯和碳纳米管（CNTS）中晶格导热率的厚度依赖性（CNT）； （2）四频相互作用是在石墨材料中减少或扩大流体动力语音传输的温度窗口； （3）激子扩散是否可以为分层光电和电子材料中热点的热量传输提供另一个通道； （4）激子偶联如何影响新兴TMD设备中的晶格热传输和局部非平衡。这些问题将通过新的计算模型来解决，这些模型整合了兴趣量 - phonon和四个phonon耦合的前沿原理理论，以及独特的纳米级热量计量工具，包括多探针热传输和光热电流测量。对四个phonon和激子 - 波相互作用的基本了解有助于建立建模和控制能量耗散的基础，并在新兴的分层电子和光电设备中建立了能量耗散和热运输。这奖反映了NSF的法规任务，并被认为是通过基金会的知识优点和广泛的criter scriter scriter scriter criter scriter criter criter criter criter criter criter criter criter criter criter criteria criter criteria criter criteria criter criteria criteria criteria crietia criteria criteria crietia均值得一提。