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LOW-TEMPERATURE EPITAXY OF GAAS BY METALORGANIC CHEMICAL-VAPOR-DEPOSITION
(1994-08-01)
CHEN, WK
;
CHANG, CS
;
CHEN, WC
;
電子物理學系
;
光電工程學系
The low-temperature (LT) epitaxial growth of high quality GaAs films is achieved by using triethylgallium and tertiarybutylarsine as the precursors. Without any external work, the deposition can be conducted at a temperature as low as 350-degrees-C in a conventional metalorganic chemical vapor deposition system. The full width at half-maximum of 77 K photoluminescence and X-ray rocking curve for a sample grown at 425-degrees-C are 8.2 meV and 14 arcsec, respectively. Materials with good electrical properties were also obtained. A Schottky diode formed on the LT CaAs epilayer shows a barrier height of 0.83 eV, and a reverse saturation current of 1.1 X 10(-7) A/cm2, comparable to that of a normal GaAs Schottky diode.