Structure of arsenic-treated indium phosphide (001) surfaces during metalorganic vapor-phase epitaxy
Identifieur interne : 00E007 ( Main/Repository ); précédent : 00E006; suivant : 00E008Structure of arsenic-treated indium phosphide (001) surfaces during metalorganic vapor-phase epitaxy
Auteurs : RBID : Pascal:02-0419879Descripteurs français
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Abstract
We have studied the initial stages of heterojunction formation during the metalorganic vapor-phase epitaxy of indium arsenide on indium phosphide. Exposing an InP (001) film to 10 mTorr of tertiarybutylarsine below 500°C results in the deposition of a thin InAs layer from 1.5 to 5.0 atomic layers thick (2.3-7.5 Å). The surface of this epilayer remains atomically smooth independent of arsenic exposure time. However, in an overpressure of tertiarybutylarsine at or above 500°C, the arsenic atoms diffuse into the bulk, creating strained InAsP films. These films form three-dimensional island structures to relieve the built-up strain. The activation energy and pre-exponential factor for arsenic diffusion into indium phosphide have been determined to be Ed=1.7±0.2 eV and Do=2.3±1.0×10-7 cm2/s.
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<author><name sortKey="Sun, Y" uniqKey="Sun Y">Y. Sun</name>
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<author><name sortKey="Hicks, R F" uniqKey="Hicks R">R. F. Hicks</name>
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<term>Indium compounds</term>
<term>Internal stresses</term>
<term>Island structure</term>
<term>MOCVD</term>
<term>MOCVD coatings</term>
<term>Organic compounds</term>
<term>Semiconductor epitaxial layers</term>
<term>Semiconductor growth</term>
<term>Surface topography</term>
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<term>Composé organique</term>
<term>Arsenic composé</term>
<term>Méthode MOCVD</term>
<term>Revêtement MOCVD</term>
<term>Topographie surface</term>
<term>Couche épitaxique semiconductrice</term>
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<front><div type="abstract" xml:lang="en">We have studied the initial stages of heterojunction formation during the metalorganic vapor-phase epitaxy of indium arsenide on indium phosphide. Exposing an InP (001) film to 10 mTorr of tertiarybutylarsine below 500°C results in the deposition of a thin InAs layer from 1.5 to 5.0 atomic layers thick (2.3-7.5 Å). The surface of this epilayer remains atomically smooth independent of arsenic exposure time. However, in an overpressure of tertiarybutylarsine at or above 500°C, the arsenic atoms diffuse into the bulk, creating strained InAsP films. These films form three-dimensional island structures to relieve the built-up strain. The activation energy and pre-exponential factor for arsenic diffusion into indium phosphide have been determined to be E<sub>d</sub>
=1.7±0.2 eV and D<sub>o</sub>
=2.3±1.0×10<sup>-7</sup>
cm<sup>2</sup>
/s.</div>
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