UV Photoemission Studies on PbTe, SnTe and GeTe in Polycrystalline and Amorphous Phases

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概要

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• Photoemission spectra of PbTe, SnTe and GeTe in polycrystalline (c-) and amor-phous (a-) phases have been measured with excitation photon energies between 16 and80 eV. Three peaks in the valence band spectra are attributed to bonding p, cation sand Te s states. Widths of bonding p states suggest that the covalency is stronger inthe order of PbTe<SnTe<GeTe in c-phase and in the order of SnTe<GeTe in a-phase, and the covalency is stronger in a-phase than in c-phase in the same material.From the spectral shape of constant-initial-state spectra of each initial state in thevalence band, it is derived that excited states from the cation outermost d levels are lo-calized but those from, Te 4d levels are not in c-IVTe',v, while vice versa in o-GeTe.This also indicates that the covalency is stronger in *-phase than in c-phase.[Gesemicon- ]j ductor,Iprocess, lj photoemissiontTe, SnTe, PbTe, amorphous, UPS, covalency, ionicity, degenerateband structure, core exciton, direct recombinatuon, Auger

• 社団法人日本物理学会の論文
• 1992-03-15

著者

• Fukui Kazutoshi

  Department Of Applied Physics Fukui University

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