Investigations of the Sb/CdTe(100)-(2×1) interfacial structure with photoemission

P. John; F. M. Leibsle; T. Miller; T. C. Hsieh; T. C. Chiang

doi:10.1016/0749-6036(87)90205-9

Investigations of the Sb/CdTe(100)-(2×1) interfacial structure with photoemission

P. John, F. M. Leibsle, T. Miller, T. C. Hsieh, T. C. Chiang

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Clean CdTe(100) surfaces were generated by molecular beam epitaxy (MBE). High energy electron diffraction (HEED) and photoemission were used to determine surface quality and to make comparisons with surfaces generated via cycles of ion sputtering and annealing. Photoemission, HEED, and Auger electron spectroscopy were used to study the properties of the Sb/CdTe(100)-(2×1) interface. Photoemission spectra of the Cd 4d and Te 4d core levels showed no changes when Sb was deposited on the clean surface at room temperature. HEED showed that the Sb films where polycrystalline. Annealing caused the polycrystalline films to convert to a sharp (2×2) reconstructed surface. Auger spectra indicated that annealing causes desorption of all but 1 2 monolayer of Sb from the surface. Photoemission spectra of the Cd 4d core level showed a significant depletion in intensity of the surface shifted component. The Sb 4d core level spectrum showed a large shift (0.72 eV) in binding energy in converting from polycrystalline to the (2×2) surface. A model is proposed for the (2×2) surface structure in which Sb atoms are bonded to two Cd atoms,and Cd atoms are bonded to only one Sb atom. In order to satisfy dangling bonds, the Sb atoms also form dimer bonds with each other.

Original language	English
Pages (from-to)	347-355
Number of pages	9
Journal	Superlattices and Microstructures
Volume	3
Issue number	4
DOIs	https://doi.org/10.1016/0749-6036(87)90205-9
State	Published - 1987
Externally published	Yes

Funding

ACKNOWLEDGMENTS - This material is based upon work supported by the U.S. Department of Energy, Division of Materials Sciences, under Contract No. DE-AC02-76ER01198. Some of the equipment used for this research was obtained with grants from the National Science Foundation (Grants. No. DMR-8352083, and No. DMR-8614234). the 3M Company, Hewlett-Packard Laboratories, and E.I. du Pont de Nemours and Company. The Synchrotron Radiation Center of the University of Wisconsin-Madison is supported by the National Science Foundation under Contract No. DMR-8020164. We acknowledge the use of central facilities of the Materials Research Laboratory of the University of Illinois, which is supported by the U.S. Department of Energy, Division of Materials Sciences, under Contract No. DE-AC02-76ER01198, and the National Science Foundation under Contract No. DMR-8020250.

Funders	Funder number
National Science Foundation	DMR-8352083, DE-AC02-76ER01198
U.S. Department of Energy
Division of Materials Sciences and Engineering

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title = "Investigations of the Sb/CdTe(100)-(2×1) interfacial structure with photoemission",

abstract = "Clean CdTe(100) surfaces were generated by molecular beam epitaxy (MBE). High energy electron diffraction (HEED) and photoemission were used to determine surface quality and to make comparisons with surfaces generated via cycles of ion sputtering and annealing. Photoemission, HEED, and Auger electron spectroscopy were used to study the properties of the Sb/CdTe(100)-(2×1) interface. Photoemission spectra of the Cd 4d and Te 4d core levels showed no changes when Sb was deposited on the clean surface at room temperature. HEED showed that the Sb films where polycrystalline. Annealing caused the polycrystalline films to convert to a sharp (2×2) reconstructed surface. Auger spectra indicated that annealing causes desorption of all but 1 2 monolayer of Sb from the surface. Photoemission spectra of the Cd 4d core level showed a significant depletion in intensity of the surface shifted component. The Sb 4d core level spectrum showed a large shift (0.72 eV) in binding energy in converting from polycrystalline to the (2×2) surface. A model is proposed for the (2×2) surface structure in which Sb atoms are bonded to two Cd atoms,and Cd atoms are bonded to only one Sb atom. In order to satisfy dangling bonds, the Sb atoms also form dimer bonds with each other.",

author = "P. John and Leibsle, {F. M.} and T. Miller and Hsieh, {T. C.} and Chiang, {T. C.}",

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AU - Leibsle, F. M.

AU - Miller, T.

AU - Hsieh, T. C.

AU - Chiang, T. C.

PY - 1987

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N2 - Clean CdTe(100) surfaces were generated by molecular beam epitaxy (MBE). High energy electron diffraction (HEED) and photoemission were used to determine surface quality and to make comparisons with surfaces generated via cycles of ion sputtering and annealing. Photoemission, HEED, and Auger electron spectroscopy were used to study the properties of the Sb/CdTe(100)-(2×1) interface. Photoemission spectra of the Cd 4d and Te 4d core levels showed no changes when Sb was deposited on the clean surface at room temperature. HEED showed that the Sb films where polycrystalline. Annealing caused the polycrystalline films to convert to a sharp (2×2) reconstructed surface. Auger spectra indicated that annealing causes desorption of all but 1 2 monolayer of Sb from the surface. Photoemission spectra of the Cd 4d core level showed a significant depletion in intensity of the surface shifted component. The Sb 4d core level spectrum showed a large shift (0.72 eV) in binding energy in converting from polycrystalline to the (2×2) surface. A model is proposed for the (2×2) surface structure in which Sb atoms are bonded to two Cd atoms,and Cd atoms are bonded to only one Sb atom. In order to satisfy dangling bonds, the Sb atoms also form dimer bonds with each other.

AB - Clean CdTe(100) surfaces were generated by molecular beam epitaxy (MBE). High energy electron diffraction (HEED) and photoemission were used to determine surface quality and to make comparisons with surfaces generated via cycles of ion sputtering and annealing. Photoemission, HEED, and Auger electron spectroscopy were used to study the properties of the Sb/CdTe(100)-(2×1) interface. Photoemission spectra of the Cd 4d and Te 4d core levels showed no changes when Sb was deposited on the clean surface at room temperature. HEED showed that the Sb films where polycrystalline. Annealing caused the polycrystalline films to convert to a sharp (2×2) reconstructed surface. Auger spectra indicated that annealing causes desorption of all but 1 2 monolayer of Sb from the surface. Photoemission spectra of the Cd 4d core level showed a significant depletion in intensity of the surface shifted component. The Sb 4d core level spectrum showed a large shift (0.72 eV) in binding energy in converting from polycrystalline to the (2×2) surface. A model is proposed for the (2×2) surface structure in which Sb atoms are bonded to two Cd atoms,and Cd atoms are bonded to only one Sb atom. In order to satisfy dangling bonds, the Sb atoms also form dimer bonds with each other.

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Investigations of the Sb/CdTe(100)-(2×1) interfacial structure with photoemission

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