Effects of ultraviolet irradiation during growth of ZnSe epilayers by atmospheric pressure metalorganic vapor-phase epitaxy using dimethyl zinc and H2Se |
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Authors: | Adrienne C Alton Tokuo Yodo |
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Institution: | Tsukuba Research Laboratory, Nippon Sheet Glass Co., Ltd., 5-4 Tokodai, Tsukuba City, Ibaraki Prefecture 300-26, Japan |
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Abstract: | This work has investigated the effects of ultraviolet irradiation on the epitaxial growth process of undoped ZnSe by atmospheric-pressure metalorganic vapor phase epitaxy. Dimethyl zinc and H2Se at a VI]/II] mole ratio of 20 were the source gases used for growth onto (100)-just oriented semi-insulating GaAs substrates. Hydrogen was used as the carrier gas. A 500 W Hg-Xe lamp irradiated the substrate at 300 nm wavelength during growth. Growth temperature was varied from 210 to 450°C. Epilayers grown in the presence of irradiation experienced a prominent decrease in growth rate, which occurred even at high temperatures. Through a combination of surface and vapor-phase reactions, UV irradiation also affected the photoluminescence properties, crystalline quality, and surface morphology of the epilayers. |
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