TY - JOUR
T1 - The Role of Interface Vibrational Modes in Thermal Boundary Resistance
AU - Stanley, Christopher M.
AU - Rader, Benjamin K.
AU - Laster, Braxton H.D.
AU - Servati, Mahsa
AU - Estreicher, Stefan K.
N1 - Funding Information:
B.K.R. and B.H.D.L. contributed equally to this work.
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/12
Y1 - 2021/12
N2 - Understanding how heat flows across interfaces is vital to energy efficiency and thermal stability of many electrical devices. However, the thermal resistance caused by the interface between two materials, termed Kapitza resistance, remains poorly understood. To that end, several first-principles molecular dynamic simulations and a detailed analysis of the phonon processes and associated transfer of heat at the interfaces of both c-Si|a-SiO2 and c-Si|c-Ge are presented. It is found that in both cases the interface properties are very important. In the case of c-Si|a-SiO2, it is found that interface modes cause inelastic phonon interactions and play a significant role in the total energy transferred. In the case of c-Si|a-SiO2, one is able to quantify this effect and find that there is a small set of interface modes which carry >10% of the heat, and decrease the ultimate thermal boundary resistance by 26.5%.
AB - Understanding how heat flows across interfaces is vital to energy efficiency and thermal stability of many electrical devices. However, the thermal resistance caused by the interface between two materials, termed Kapitza resistance, remains poorly understood. To that end, several first-principles molecular dynamic simulations and a detailed analysis of the phonon processes and associated transfer of heat at the interfaces of both c-Si|a-SiO2 and c-Si|c-Ge are presented. It is found that in both cases the interface properties are very important. In the case of c-Si|a-SiO2, it is found that interface modes cause inelastic phonon interactions and play a significant role in the total energy transferred. In the case of c-Si|a-SiO2, one is able to quantify this effect and find that there is a small set of interface modes which carry >10% of the heat, and decrease the ultimate thermal boundary resistance by 26.5%.
KW - Kapitza resistance
KW - germanium
KW - interfaces
KW - oxides
KW - phonon gas models
KW - silicon
KW - thermal boundary resistances
UR - http://www.scopus.com/inward/record.url?scp=85106745617&partnerID=8YFLogxK
U2 - 10.1002/pssa.202100111
DO - 10.1002/pssa.202100111
M3 - Article
AN - SCOPUS:85106745617
VL - 218
JO - Physica Status Solidi (A) Applications and Materials Science
JF - Physica Status Solidi (A) Applications and Materials Science
SN - 1862-6300
IS - 23
M1 - 2100111
ER -