Work function of bulk-insulating topological insulator Bi2- xSbxTe3- ySey

Daichi Takane, Seigo Souma, Takafumi Sato, Takashi Takahashi, Kouji Segawa, Yoichi Ando

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number091601
JournalApplied Physics Letters
Volume109
Issue number9
DOIs
Publication statusPublished - 2016 Aug 29

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Work function of bulk-insulating topological insulator Bi<sub>2-</sub> <sub>x</sub>Sb<sub>x</sub>Te<sub>3-</sub> <sub>y</sub>Se<sub>y</sub>'. Together they form a unique fingerprint.

Cite this