Structural study of degraded ZnMgSSe blue light emitters |
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Authors: | K Nakano S Tomiya M Ukita H Yoshida S Itoh E Morita M Ikeda A Ishibashi |
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Affiliation: | (1) Sony Corporation Research Center, 174 Fujitsuka-cho, 240 Hodogaya-ku,Yokohama, Japan |
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Abstract: | Using electroluminescence (EL) topography and transmission electron microscopy (TEM), we investigated the nonluminescent regions
which form while current is being injected into ZnMgSSe/ZnSSe/ZnCdSe-based blue light emitters. Small dark spots were observed
just after turn-on and spread out forming rough nonluminescent triangles in the <100> directions in the EL image of the active
region. TEM studies showed that the small dark spots are pre-existing stacking faults originating at the substrate/epitaxial
layer interface. The nonluminescent triangles were found to be a dense region of dislocation dipoles and dislocation loops.
Each dipole was aligned along two <110> directions in the {111} planes. The Burgers vectors were of the type a/2<011> inclined
at 45° to the (001) junction plane. |
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Keywords: | Blue laser degradation dislocation stacking fault ZnMgSSe |
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