Electronic structure of (Ge2 Sb2 Te5) 1-x(In3 SbTe2)x investigated by x-ray photoelectron spectroscopy

Anass Benayad, Younseon Kang, Hyun Joon Shin, Kihong Kim, Dong Seok Suh, Kijoon Kim, Cheolkyu Kim, Tae Yon Lee, Jin Seo Noh, Jaecheol Lee, Yoonho Khang

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We have investigated the core levels and the valence band of (Ge 2 Sb2 Te5)1-x(In3 Sb 1 Te2)x quaternary phase system (IGST) by means of x-ray photoelectron spectroscopy. A systematic shift of Sb 3d and Ge 2p core-level peaks toward lower binding energies side was observed with increasing indium amount, whereas the In 3d and Te 3d core peaks showed less change. The Sb 3d and Ge 2p core-level shift is attributed to an increase in the electronic charge of p -electrons dependent of indium amount. The valence band spectra show a distinct change in the sp configuration with indium concentration change. The change in the local bonding as the indium amount increase has a profound impact on both local atomic arrangement and amorphous-to-crystalline transformation temperature. The difference in the photoemission spectra have been discussed according to a simple structural model suggesting that the Na site in IGST can be occupied by Te, Sb, In, and vacancy, whereas in GST it is occupied only by Te.

Original languageEnglish
Article number043701
JournalJournal of Applied Physics
Issue number4
StatePublished - 2009


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