セガワ コウジ   SEGAWA KOJI
  瀬川 耕司
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2016/08
形態種別 研究論文
標題 Work function of bulk-insulating topological insulator Bi2-xSbxTe3-ySey
執筆形態 その他
掲載誌名 APPLIED PHYSICS LETTERS
出版社・発行元 AMER INST PHYSICS
巻・号・頁 109(9)
著者・共著者 Daichi Takane,Seigo Souma,Takafumi Sato,Takashi Takahashi,Kouji Segawa,Yoichi Ando
概要 Recent discovery of bulk insulating topological insulator (TI) Bi2-xSbxTe3-ySey paved a pathway toward practical device application of TIs. For realizing TI-based devices, it is necessary to contact TIs with a metal. Since the band-bending at the interface dominates the character of devices, knowledge of TIs' work function is of essential importance. We have determined the compositional dependence of the work function in Bi2-xSbxTe3-ySey by high-resolution photoemission spectroscopy. The obtained work-function values (4.95-5.20 eV) track the energy shift of the surface chemical potential seen by angle-resolved photoemission spectroscopy. The present result serves as a useful guide for developing TI-based electronic devices. Published by AIP Publishing.
DOI 10.1063/1.4961987
ISSN 0003-6951/1077-3118
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