journal article·2019-12-24

Origin of Band Modulation in GeTe-Rich Ge–Sb–Te Thin Film

Deniz P. Wong, Masoud Aminzare, Ta-Lei Chou, Chin-Sheng Pang, Yi-Ren Liu, Tzu-Hsien Shen, Benjamin K. Chang, Hsiang-Ting Lien, Sun-Tang Chang, Chia-Hua Chien, Yang-Yuan Chen, Ming-Wen Chu, Yaw-Wen Yang, Wen-Pin Hsieh, Gerda Rogl, Peter Rogl, Yohei Kakefuda, Takao Mori, Mei-Yin Chou, Li-Chyong Chen, Kuei-Hsien Chen

ACS Applied Electronic Materials· Volume 1· Issue 12
Publisher page

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Phase-change materials and chalcogenides · Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan

Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan

National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

Institute of Physics, Academia Sinica, Taipei 11529, Taiwan

Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan

Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan

Christian Doppler Laboratory for Thermoelectricity, Institute of Materials Chemistry, University of Vienna, Währingerstrasse 42, A-1090 Wien, Austria

Institute of Solid State Physics, TU-Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria

International Center for Materials Nanoarchitectonics (WPI-MANA) and Center for Functional Sensor & Actuator (CFSN), Namiki 1-1, Tsukuba 305-0044, Japan

Funding

Academia Sinica

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