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Simulation of post-growth Be diffusion in InGaAsP grown by GSMBE

Identifieur interne : 014966 ( Main/Repository ); précédent : 014965; suivant : 014967

Simulation of post-growth Be diffusion in InGaAsP grown by GSMBE

Auteurs : RBID : Pascal:99-0297732

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English descriptors

Abstract

Be diffusion in InGaAsP quaternary alloys lattice matched to InP by gas source molecular beam epitaxy (GSMBE) was studied using Secondary Ion Mass Spectrometry (SIMS). The experimental structures consisted of a 0.2 μm Be-doped (3 × 1019 cm-3) In0.73Ga0.27As0.58P0.4 epilayer sandwiched between two 0.5 μm undoped In0.73Ga0.27As0.58P0.42 epilayers. The samples were subjected to rapid thermal annealing (RTA) in the temperature range from 700°C to 900°C with time durations of 10-240 s. Be diffusion was simulated, in order to obtain the best agreements with experimental profiles, according to two kick-out models: the first model using neutral Be interstitials and singly positively charged (Ga, In) self-interstitials, and the second model using singly positively charged Be interstitials and doubly positively charged Ga, In self-interstitials. Comparison with experimental data shows that the first kick-out model gives a better description.

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Pascal:99-0297732

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<div type="abstract" xml:lang="en">Be diffusion in InGaAsP quaternary alloys lattice matched to InP by gas source molecular beam epitaxy (GSMBE) was studied using Secondary Ion Mass Spectrometry (SIMS). The experimental structures consisted of a 0.2 μm Be-doped (3 × 10
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<sup>-3</sup>
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As
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<sub>0.73</sub>
Ga
<sub>0.27</sub>
As
<sub>0.58</sub>
P
<sub>0.42</sub>
epilayers. The samples were subjected to rapid thermal annealing (RTA) in the temperature range from 700°C to 900°C with time durations of 10-240 s. Be diffusion was simulated, in order to obtain the best agreements with experimental profiles, according to two kick-out models: the first model using neutral Be interstitials and singly positively charged (Ga, In) self-interstitials, and the second model using singly positively charged Be interstitials and doubly positively charged Ga, In self-interstitials. Comparison with experimental data shows that the first kick-out model gives a better description.</div>
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<sup>19</sup>
cm
<sup>-3</sup>
) In
<sub>0.73</sub>
Ga
<sub>0.27</sub>
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<sub>0.73</sub>
Ga
<sub>0.27</sub>
As
<sub>0.58</sub>
P
<sub>0.42</sub>
epilayers. The samples were subjected to rapid thermal annealing (RTA) in the temperature range from 700°C to 900°C with time durations of 10-240 s. Be diffusion was simulated, in order to obtain the best agreements with experimental profiles, according to two kick-out models: the first model using neutral Be interstitials and singly positively charged (Ga, In) self-interstitials, and the second model using singly positively charged Be interstitials and doubly positively charged Ga, In self-interstitials. Comparison with experimental data shows that the first kick-out model gives a better description.</s0>
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