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나노구조물 첨가를 이용한 고온에서의 고체 열전도도 감소
김우철(Woochul Kim),김강민(Kangmin Kim),박준영(Junyoung Park),Suzanne L. Singer,Arun Majumdar,Dmitri Klenov,Arthur C. Gossard,Susanne Stemmer,Joshua M. O. Zide 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Thermal conductivity of a crystalline solid at high temperature is dominated by the Umklapp process because the number of high frequency phonons increases as with temperature. It is challenging to reduce the thermal conductivity of crystalline solids at high temperature although it is widely known that by increasing the atomic defect concentration, thermal conductivity of crystalline solids can be reduced at low temperature. By increasing the concentration of ErAs nanoparticles in In0.53Ga0.47 As up to 6 atomic percent, we demonstrate a thermal conductivity reduction by almost a factor of three below that of In0.53Ga0.47 As at high temperature. A theoretical model suggests that the mean free path of the low frequency phonons is suppressed by increasing the ErAs nanoparticle concentration.