Browsing by Author "Yang, Ping-Hsing"

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Structural stability of diffusion barriers in thermoelectric SbTe: From first-principles calculations to experimental results
(2014-03-05)
Hsu, Hsiao-Hsuan
;
Cheng, Chun-Hu
;
Chiou, Shan-Haw
;
Huang, Chiung-Hui
;
Liu, Chia-Mei
This study involved developing robust diffusion barrier for n-type antimony telluride (SbTe) thermoelectric devices. Compared to conventional Ni barrier, the mid-band metals of Ta and TaN with favored ohmic-like contact exhibited smaller diffusion tail because of structurally stable interface on SbTe, which have been supported by first-principles calculations and demonstrated by experimental results. Furthermore, the TaN barrier has strong ionic Ta-N bonding and a high total energy of -4.7 eV/atom that could effectively suppress the formation of SbTe-compounds interfacial layer. (C) 2013 Elsevier B. V. All rights reserved.