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

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 work function in Bi2-xSbxTe3-ySey by high-resolution photoemission spectroscopy. The obtained work-function values (4.95-5.20 eV) show a systematic variation with the composition, well tracking 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.

preprint2016arXivOpen access
Daichi TakaneSeigo SoumaTakafumi SatoTakashi TakahashiKouji SegawaYoichi Ando
cond-mat.mes-hallcond-mat.str-el
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Daichi TakaneSeigo SoumaTakafumi SatoTakashi TakahashiKouji SegawaYoichi Ando

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