Abstract
How the energy transfers during electron-phonon nonequilibrium in thin metal films is still an open question, and how to measure the intrinsic thermal transport properties of the material under the covering layer is another challenge. In this paper, the heat transfer process from electron-phonon nonequilibrium in thin gold film to borosilicate glass substrate has been studied by resorting to different segments of the transient thermoreflectance signal, which is obtained from the rear-pump front-probe transient thermoreflectance technique. The gold film, which has a thickness of 23.1 nm, is deposited on the borosilicate glass substrate using using a physical vapor deposition (PVD) approach. Within the framework of the twotemperature model (TTM), the electron-phonon (e-ph) coupling factors of the gold film, which reflect the strength of heat flow from hot electrons to cold phonons, are derived from the signal taken after the first several picoseconds with different pump fluences, and the measured value is (1.95-2.05)×1016 W m-3 K-1. The electron-phonon coupling factor does not significantly change in response to the pump pulse fluence variation and exhibits little change compared to the bulk gold value 2.4× 10 16 W m-3 K-1. Furthermore, the thermal conductivity of the glass substrate is obtained through the thermoreflectance signal between 20 to 140 picoseconds and the value is 3 W m-1 K -1.
| Original language | English |
|---|---|
| Title of host publication | ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010 |
| Pages | 625-632 |
| Number of pages | 8 |
| Edition | PARTS A AND B |
| DOIs | |
| Publication status | Published - Dec 1 2010 |
| Event | ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2010 Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting - Montreal, QC, Canada Duration: Aug 1 2010 → Aug 5 2010 |
Publication series
| Name | ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010 |
|---|---|
| Number | PARTS A AND B |
Other
| Other | ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2010 Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting |
|---|---|
| Country | Canada |
| City | Montreal, QC |
| Period | 8/1/10 → 8/5/10 |
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All Science Journal Classification (ASJC) codes
- Fluid Flow and Transfer Processes
Cite this
Study the heat transfer process from electron-phonon nonequilibrium in thin gold film to glass substrate through transient thermoreflectance measurements. / Ma, Weigang; Wang, Haidong; Zhang, Xing; Wang, Wei.
ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010. PARTS A AND B. ed. 2010. p. 625-632 (ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010; No. PARTS A AND B).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Study the heat transfer process from electron-phonon nonequilibrium in thin gold film to glass substrate through transient thermoreflectance measurements
AU - Ma, Weigang
AU - Wang, Haidong
AU - Zhang, Xing
AU - Wang, Wei
PY - 2010/12/1
Y1 - 2010/12/1
N2 - How the energy transfers during electron-phonon nonequilibrium in thin metal films is still an open question, and how to measure the intrinsic thermal transport properties of the material under the covering layer is another challenge. In this paper, the heat transfer process from electron-phonon nonequilibrium in thin gold film to borosilicate glass substrate has been studied by resorting to different segments of the transient thermoreflectance signal, which is obtained from the rear-pump front-probe transient thermoreflectance technique. The gold film, which has a thickness of 23.1 nm, is deposited on the borosilicate glass substrate using using a physical vapor deposition (PVD) approach. Within the framework of the twotemperature model (TTM), the electron-phonon (e-ph) coupling factors of the gold film, which reflect the strength of heat flow from hot electrons to cold phonons, are derived from the signal taken after the first several picoseconds with different pump fluences, and the measured value is (1.95-2.05)×1016 W m-3 K-1. The electron-phonon coupling factor does not significantly change in response to the pump pulse fluence variation and exhibits little change compared to the bulk gold value 2.4× 10 16 W m-3 K-1. Furthermore, the thermal conductivity of the glass substrate is obtained through the thermoreflectance signal between 20 to 140 picoseconds and the value is 3 W m-1 K -1.
AB - How the energy transfers during electron-phonon nonequilibrium in thin metal films is still an open question, and how to measure the intrinsic thermal transport properties of the material under the covering layer is another challenge. In this paper, the heat transfer process from electron-phonon nonequilibrium in thin gold film to borosilicate glass substrate has been studied by resorting to different segments of the transient thermoreflectance signal, which is obtained from the rear-pump front-probe transient thermoreflectance technique. The gold film, which has a thickness of 23.1 nm, is deposited on the borosilicate glass substrate using using a physical vapor deposition (PVD) approach. Within the framework of the twotemperature model (TTM), the electron-phonon (e-ph) coupling factors of the gold film, which reflect the strength of heat flow from hot electrons to cold phonons, are derived from the signal taken after the first several picoseconds with different pump fluences, and the measured value is (1.95-2.05)×1016 W m-3 K-1. The electron-phonon coupling factor does not significantly change in response to the pump pulse fluence variation and exhibits little change compared to the bulk gold value 2.4× 10 16 W m-3 K-1. Furthermore, the thermal conductivity of the glass substrate is obtained through the thermoreflectance signal between 20 to 140 picoseconds and the value is 3 W m-1 K -1.
UR - http://www.scopus.com/inward/record.url?scp=84862922136&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84862922136&partnerID=8YFLogxK
U2 - 10.1115/FEDSM-ICNMM2010-30364
DO - 10.1115/FEDSM-ICNMM2010-30364
M3 - Conference contribution
AN - SCOPUS:84862922136
SN - 9780791854501
T3 - ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010
SP - 625
EP - 632
BT - ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010
ER -