X‐ray photoelectron spectroscopy studies of initial growth mechanism of CdTe layers grown on (100)GaAs by organometallic vapor phase epitaxy
作者:
Syuji Sone,
Mitsuru Ekawa,
Kazuhito Yasuda,
Yoshiyuki Sugiura,
Manabu Saji,
Akikazu Tanaka,
期刊:
Applied Physics Letters
(AIP Available online 1990)
卷期:
Volume 56,
issue 6
页码: 539-541
ISSN:0003-6951
年代: 1990
DOI:10.1063/1.102738
出版商: AIP
数据来源: AIP
摘要:
Variations of the GaAs surface conditions and the adsorption of the precursor elements of Cd and Te on the (100)GaAs substrate were studied by x‐ray photoelectron spectroscopy at the initial stage of CdTe growth by organometallic vapor phase epitaxy. The stoichiometry of GaAs substrates was found to recover by annealing in the H2environment (500 °C, 5 min), while the surface was initially in an As‐rich condition after etching with H2SO4:H2O2:H2O (5:1:1). The preferential adsorption of Te on the GaAs surface was also observed. 〈100〉 oriented growth was obtained routinely when the GaAs surface was fully stabilized with Te after the H2anneal under the above conditions. 〈111〉 oriented growth resulted when dimethylcadmium was first introduced after the anneal.
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