Hohyun Lee, Dezhi Wang, Wenzhong Wang, Z. Ren, B. Klotz, M. Tang, Ronggui Yang, P. Gogna, Jean-Pierre Fleuiral, M. Dresselhaus, Gang Chen
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In this study, we developed a nano-composite approach to make bulk materials with nanostructures that have lower thermal conductivity than their bulk alloy counterparts. Room temperature measurement results of Si/Ge composites with nano-particle shows lower thermal conductivity than that of Si/Ge composites made with micro-sized particles. For high density sample, we also observed thermal conductivity reduction without deterioration of electrical conductivity so that higher ZT than bulk alloy is achieved.
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