|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
||Tailoring Thermoelectric Properties of Telluride-based Materials from Bulk to Thin Films
||Li-Chyong Chen, Deniz Wong, Kuei-Kuan Wu, Kuei-Hsien Chen
|On-Site Speaker (Planned)
(Invited) Telluride-based compounds have been the backbone of thermoelectric materials research for more than half a century. Here, two different telluride-based materials are showcased: p-type phase-change Ge-Sb-Te (GST) alloys and n-type skutterudite Co-Ge-Te (CGT) alloy. In the GST thin film, we can easily obtain the high zT rock-salt structure, which is typically observed only at high temperature for its bulk counterpart. Moreover, GST film exhibited a peculiar temperature-dependent band-convergence behavior, consequently led to a high power factor value and high zT number (>2). In the CGT system, adding Sb dramatically improved its thermoelectric performance by boosting its electrical properties without sacrificing its Seebeck coefficient. Interestingly, the film showed an uncharacteristic enhancement in electrical conductivity, leading to a world-record-high power factor value (200 μW/cm-K2). This talk would cover the various effects of phase, composition, defects and the post-treatment processes that led to superior thermoelectric performance.
||Planned: Supplemental Proceedings volume