4.7 Article

Amorphous carbon interlayer modulated interfacial thermal conductance between Cu and diamond

Journal

APPLIED SURFACE SCIENCE
Volume 638, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apsusc.2023.158001

Keywords

Cu; diamond interface; Interfacial heat transfer; Interfacial bonding effect; Vibrational bridging effect; Time-domain thermoreflectance

Ask authors/readers for more resources

Introducing an interlayer is an effective method to improve the interfacial thermal conductance of highly mismatched Cu/diamond interface. The interfacial bonding effect and vibrational bridging effect of the interlayer play different roles in increasing the interfacial thermal conductance. The interfacial bonding effect mainly contributes to the increase in thermal conductance, while the vibrational bridging effect becomes dominant at higher interfacial bonding strengths.
Introducing an interlayer is an effective method to improve the interfacial thermal conductance (G) of highly mismatched Cu/diamond interface. However, the relative role of interfacial bonding effect and vibrational bridging effect of the interlayer is still not clear. Herein, we introduce amorphous carbon (a-C) layer by Ar ion bombardment, oxygenated a-C layer by Ar/O2 mixture ion bombardment, and C-O bond by acid treatment at the Cu/diamond interface to regulate the interfacial bonding effect and vibrational bridging effect. The G of Cu/ diamond is increased by 44% with increasing interfacial bonding strength from 12 mN to 17 mN and then is independent on interfacial bonding strength above 17 mN, which mainly comes from the interfacial bonding effect. Compared with the as-cleaned Cu/diamond interface, a 35% increase of G is obtained by inserting a 4.5 nm-thick a-C interlayer between Cu and diamond, which mainly comes from the vibrational bridging effect. The vibrational bridging effect overwhelms the interfacial bonding effect in improving the G of Cu/diamond interface when the interfacial bonding strength is relatively high. The findings give insights into the mechanisms dictating heat transfer of highly mismatched metal/non-metal interface and provide a new avenue for improving the G of Cu/diamond interface.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available