On the onset of InAs islanding on InP: influence of surface steps
| Autor: | M.M.G. de Carvalho, E. A. Meneses, Mônica A. Cotta, C.A.C. Mendonça |
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| Rok vydání: | 1997 |
| Předmět: |
Surface diffusion
Photoluminescence Materials science Condensed matter physics business.industry Surfaces and Interfaces Condensed Matter Physics Epitaxy Chemical beam epitaxy Surfaces Coatings and Films chemistry.chemical_compound Optics chemistry Materials Chemistry Islanding Thin film Indium arsenide business Quantum well |
| Zdroj: | Surface Science. 388:84-91 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/s0039-6028(97)00377-4 |
| Popis: | We investigate the transition from two- to three-dimensional growth of thin InAs films on InP by chemical beam epitaxy. This transition is shown to strongly depend on growth temperature and on the misorientation-or the presence of surface steps — on the InP surface where the InAs film is deposited. Low temperature photoluminescence measurements on InP-InAs-InP quantum well structures and atomic force microscopy analysis of InAs-InP structures indicate different islanding behaviors for substrates with different misorientations, the onset of islanding process occurring earlier for misoriented than for nominal substrates. The shape and distribution of the islands indicate the existence of a step edge barrier altering the diffusion dynamics on the surface. Low growth temperature is shown to delay islanding for a fixed deposition time and also limit island formation to certain regions of the sample where smooth corrugations (slope ∼1°) are observed. |
| Databáze: | OpenAIRE |
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