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- W3043791322 abstract "We analyze the structure of dislocations in electrically aged InAs quantum dot (QD) lasers on silicon to understand gradual device degradation. We find that misfit dislocations lengthen due to carrier injection, experiencing a combination of recombination-enhanced climb and glide processes constrained by the epitaxial structure. An examination of the dislocation geometry reveals that the climb process involves the addition of atoms to the extra half plane of the dislocation. Spontaneous emission from the QDs is also dimmer after aging. Additionally, the signature of misfit dislocations in the unaged laser, discernible as sharp dark lines in spatially resolved cathodoluminescence, is replaced by finer, more inhomogeneous contrast upon aging. We speculate that this change arises from vacancy clouds expelled from the dislocation during climb. With this insight, we evaluate the driving forces for dislocation climb that could be at play and discuss the origins of slow degradation in QD lasers." @default.
- W3043791322 created "2020-07-23" @default.
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- W3043791322 date "2020-07-14" @default.
- W3043791322 modified "2023-10-02" @default.
- W3043791322 title "Recombination-enhanced dislocation climb in InAs quantum dot lasers on silicon" @default.
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- W3043791322 doi "https://doi.org/10.1063/1.5143606" @default.
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