| 项目编号: | 1402906
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| 项目名称: | Collaborative Research: Thermionic Transport across Single and Multiple Barrier Heterostructures Based on 2D Layered Materials |
| 作者: | Stephen Cronin
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| 承担单位: | University of Southern California
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| 批准年: | 2013
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| 开始日期: | 2014-07-01
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| 结束日期: | 2018-06-30
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| 资助金额: | USD275000
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | solid state thermionic energy conversion
; 1403089cronin/esfajanithermionic transport
; 2d layered heterostructure
; thermionic barrier height
; other research group
; appropriate energy barrier
; interface
; thermionic transport
; barrier material
; efficient thermionic
; thermal transport
; phonon transport
; thermionic energy conversion
; electron transport
; thermionic barrier
; addition
; layered heterostructure
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| 英文摘要: | CBET-1402906/1403089
Cronin/Esfajani
Thermionic transport is especially exciting for its potential to provide high-efficiency energy conversion devices for waste-heat recovery (e.g., in automobiles) and co-generation of electricity in power plants. In addition, highly efficient thermionics can provide efficient solid state cooling that rivals conventional vapor-compression refrigeration systems. These devices could be used to provide active cooling of electronic circuits, ultimately leading to increased performance of computing, sensing, and imaging. In addition to thermoelectric energy conversion, the proposed study of thermionic transport will impact a wide range of other device systems, including light emitting diodes (LEDs), field effect transistors (FETs), and resonant tunnel diodes (RTDs), currently being investigated by other research groups.
Solid state thermionic energy conversion can be more efficient than conventional thermoelectric energy conversion based on bulk Peltier and Seebeck effects, if the thermionic barriers can be properly engineered. However, there have been relatively few studies on solid state thermionic energy conversion, mainly because of the difficulty of fabricating interfaces with the appropriate energy barriers, characterizing thermal transport across these interfaces, and separating the bulk thermoelectric properties from the interfacial properties. 2D Layered heterostructures enable us to overcome these difficulties, and can potentially create a paradigm shift in the design of thermoelectric power generators and coolers with high efficiency.
The proposed study is designed to overcome the challenges previously facing thermionic energy conversion using layered heterostructures with gate-tuning of the thermionic barrier height. In addition to optimizing and measuring the thermoelectric figure of merit (ZT) of these novel devices, the project will: 1.) assess whether the highly anisotropic structure and the weak interface van der Waals bonding give rise to low cross-plane thermal conductance, 2.) establish the conditions under which electron transport across van der Waals bonded interfaces occurs with little scattering, 3.) evaluate the performance of various emitter and barrier materials (e.g., BN, MoS2, Bi2Te3), 4.) ascertain the extent to which hot electrons give rise to thermal non-equilibrium phonon-populations, and 5.) separate bulk and interfacial effects, and 6.) develop a rigorous model of the electron and phonon transport across these novel devices using a first-principles approach in order to address the above questions. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/96460
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Stephen Cronin. Collaborative Research: Thermionic Transport across Single and Multiple Barrier Heterostructures Based on 2D Layered Materials. 2013-01-01.
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