https://scholars.lib.ntu.edu.tw/handle/123456789/616381
標題: | Origin of Band Modulation in GeTe-Rich Ge-Sb-Te Thin Film | 作者: | Wong D.P. Pang C.-S. Liu Y.-R. Lien H.-T. Chu M.-W. Chen L.-C. LI-CHYONG CHEN |
關鍵字: | band modulation;electronic transition;germanium tellurides;phase-change;thermoelectric | 公開日期: | 2019 | 卷: | 1 | 期: | 12 | 起(迄)頁: | 2619-2625 | 來源出版物: | ACS Applied Electronic Materials | 摘要: | Germanium tellurides and their pseudobinary compounds offer interesting properties that are important in thermoelectric and phase-change applications. Despite being a class of materials under scrutiny since its discovery, unique properties and functionalities have kept on emerging in recent years. In this work, we observed another unique property of Ge-Sb-Te (GST) thin film that can be beneficial in its development for thermoelectric applications. A rapid heating and quenching process of the GST film resulted in a metastable rock-salt cubic structure, exhibiting a unique electronic-transition-like behavior. Above the transition temperature at 150 °C, we observed a temperature-induced band modulation, corroborated with changes in its effective mass and valence band position that leads to favorable electronic and thermoelectric properties. Charge transfer between Sb and Te occurred, accompanied by a distorted cubic-to-cubic structural change. The interplay of the electronic and lattice structure born out of the composition and phase of the Ge-Sb-Te thin film opened up the possibility for the future of thermoelectric devices. Copyright © 2019 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105825217&doi=10.1021%2facsaelm.9b00596&partnerID=40&md5=6ae234c247c3bad03d5417dfe9b57725 https://scholars.lib.ntu.edu.tw/handle/123456789/616381 |
ISSN: | 26376113 | DOI: | 10.1021/acsaelm.9b00596 | SDG/關鍵字: | Antimony compounds;Charge transfer;Modulation;Tellurium compounds;Thin films;Electronic transition;Germanium telluride;Pseudobinary compounds;Rock-salt cubic structures;Temperature-induced;Thermoelectric application;Thermoelectric devices;Thermoelectric properties;Germanium compounds |
顯示於: | 凝態科學研究中心 |
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