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Title: The reaction kinetics of Cu with the CdTe(111)-B surface: Formation of metastable Cu{sub x}Te (x{approx}2)

Abstract

In the present study, elemental Cu is deposited on the clean CdTe(111)-B surface and annealed in vacuum. Surface-composition maps generated by scanning Auger microcopy provide evidence that a reaction occurs between Cu and the CdTe(111)-B substrate that results in the formation of a metastable copper telluride phase Cu{sub x}Te (x{approx}2) at the surface. In situ thermal-desorption mass spectrometry measurements show that elemental Cd is released during the reaction and desorbs from the surface. Desorption of Te from the substrate is suppressed during the reaction. Analysis of Cd desorption traces demonstrates that the Cu+CdTe(111)-B reaction proceeds via zero-order kinetics, with an activation energy of 180{+-}5 kJ mol{sup -1}.

Authors:
 [1]
  1. National Renewable Energy Laboratory (NREL), Golden, Colorado 80401 (United States)
Publication Date:
OSTI Identifier:
20723221
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 123; Journal Issue: 18; Other Information: DOI: 10.1063/1.2102904; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; ACTIVATION ENERGY; ANNEALING; AUGER ELECTRON SPECTROSCOPY; CADMIUM TELLURIDES; COPPER; DESORPTION; MASS SPECTROSCOPY; REACTION KINETICS; SCANNING ELECTRON MICROSCOPY; SEMICONDUCTOR MATERIALS; SURFACES

Citation Formats

Teeter, Glenn. The reaction kinetics of Cu with the CdTe(111)-B surface: Formation of metastable Cu{sub x}Te (x{approx}2). United States: N. p., 2005. Web. doi:10.1063/1.2102904.
Teeter, Glenn. The reaction kinetics of Cu with the CdTe(111)-B surface: Formation of metastable Cu{sub x}Te (x{approx}2). United States. doi:10.1063/1.2102904.
Teeter, Glenn. Tue . "The reaction kinetics of Cu with the CdTe(111)-B surface: Formation of metastable Cu{sub x}Te (x{approx}2)". United States. doi:10.1063/1.2102904.
@article{osti_20723221,
title = {The reaction kinetics of Cu with the CdTe(111)-B surface: Formation of metastable Cu{sub x}Te (x{approx}2)},
author = {Teeter, Glenn},
abstractNote = {In the present study, elemental Cu is deposited on the clean CdTe(111)-B surface and annealed in vacuum. Surface-composition maps generated by scanning Auger microcopy provide evidence that a reaction occurs between Cu and the CdTe(111)-B substrate that results in the formation of a metastable copper telluride phase Cu{sub x}Te (x{approx}2) at the surface. In situ thermal-desorption mass spectrometry measurements show that elemental Cd is released during the reaction and desorbs from the surface. Desorption of Te from the substrate is suppressed during the reaction. Analysis of Cd desorption traces demonstrates that the Cu+CdTe(111)-B reaction proceeds via zero-order kinetics, with an activation energy of 180{+-}5 kJ mol{sup -1}.},
doi = {10.1063/1.2102904},
journal = {Journal of Chemical Physics},
number = 18,
volume = 123,
place = {United States},
year = {Tue Nov 08 00:00:00 EST 2005},
month = {Tue Nov 08 00:00:00 EST 2005}
}
  • Resonance enhanced multiphoton ionization of the X{sub 1} {sup 2}{pi}{sub 1} at {sub {approx}}{sub sol{approx}} at {sub 2} state of lead monofluoride ({sup 208}Pb{sup 19}F) via the B {sup 2}{sigma}{sub 1} at {sub {approx}}{sub sol{approx}} at {sub 2} state is demonstrated. The ionization potential is observed to be 7.54(1) eV. Limits on the lifetime of the B state are found to be consistent with that reported by Chen et al. The transition dipole moment for the X{sub 1}{yields}B transition is found to be 0.005(1) a.u. Limits on the ionization cross section of the B state are found.
  • This work is dedicated to investigation of new disordered bismuth-containing oxy-phosphates compounds with an original structure type. As previously observed in this series, they are formed of [M{sub 4}Bi{sub 2n-2}O{sub 2n}]{sup x+} polycationic ribbons of width n O(Bi,M){sub 4} tetrahedra, surrounded by PO{sub 4} groups. In the new crystal structure type, double (=D), triple (=T) and tunnels (=t) alternate along a common axis obeying the TtDtTtDt/TTtTTt sequence in respect to a nomenclature previously described and recalled in this work. The existence this new polymorph has first been detected by electron diffraction in a multi-phased sample. Then, the crystal structure type,more » i.e., the TtDtTtDt/TTtTTt sequence, has been deduced from HREM images help to a contrast-interpreting code available for these series of polycations-formed compounds. The subsequent compounds formulation leads to a number of new materials that verify the general formula: [Bi{sub 2}(Bi,M){sub 4}O{sub 4}]{sub 2} [Bi{sub 4}(Bi,M){sub 4}O{sub 6}]{sub 6} (PO{sub 4}){sub 28} M{sub x}, with x=<12 and M=Cu{sup 2+}, Cd{sup 2+} cations. Single crystals of the nominal [O6Bi{sub 4.57}Cd{sub 3.43}]{sub 4}{sup +8.57} [O{sub 6}Bi{sub 4}Cd{sub 4}]{sub 2}{sup +8} [O{sub 4}Bi{sub 2}Cd{sub 3.56}Cu{sub 0.44}]{sub 2}{sup +6} (PO{sub 4}){sub 28} Cu{sub 10.86} have been prepared in a further stage and confirms the predicted crystal structure, Bi{sub {approx}}{sub 3.785}Cd{sub {approx}}{sub 3.575}Cu{sub {approx}}{sub 1.5}(PO{sub 4}){sub 3.5}O{sub 5.5}= , a=11.506(8)A, b=5.416(4)A, c=53.94 (4)A, {beta}=90.10(1){sup o}, RF=0.0835, RwF=0.0993, SG=A2/m, Z=8. As already observed for other elements of this family such as Bi{sub {approx}}{sub 1.2}M{sub {approx}}{sub 1.2}O{sub 1.5}(PO{sub 4}), Bi{sub {approx}}{sub 6.2}Cu{sub {approx}}{sub 6.2}O{sub 8}(PO{sub 4}){sub 5} or Bi{sub {approx}}{sub 3}Cd{sub {approx}}{sub 3.72}M{sub {approx}}{sub 1.28}O{sub 5}(PO{sub 4}){sub 3} (M=Cu, Co, Zn), this compound shows an additional example of PO{sub 4} disorder due to the presence of mixed Bi{sup 3+}/M{sup 2+} sites at the edges of ribbons. The origin and consequence of this so-called disorder mostly occurring on PO{sub 4} configurations is intensively discussed and has been characterized by infrared spectroscopy and by neutron diffraction on similar compounds. It is noticeable that the great number of antagonist PO{sub 4} configurations may order along the b-axis within a large periodicity which involves incommensurate lattice.« less
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