Structural, electrical and optical characterization of single-crystal ErAs layers grown on GaAs by MBE
| Autor: | H. D. Müller, J. Schneider, W. Rothemund, N. Herres, K. Thonke, P. Hiesinger, John D. Ralston, P. Wennekers, Frank Fuchs, J. Schmälzlin, H. Ennen |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 1990 |
| Předmět: |
Materials science
Reflection high-energy electron diffraction Condensed matter physics MBE Analytical chemistry Cathodoluminescence Heterojunction metal-semiconductor-heterostructure Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Electron diffraction strained layer Materials Chemistry Metall-Halbleiter-Heterostruktur Electrical and Electronic Engineering Single crystal Molecular beam Molecular beam epitaxy |
| Popis: | A detailed study is presented of the structural, electrical, and optical properties of ErAs films grown on GaAs by molecular beam epitaxy (MBE). ErAs layers 1500A thick were grown successfully over a relatively wide range of substrate temperatures (420-580° C), although overgrowth of GaAs on ErAs was found to be difficult. In-situ reflection highenergy electron diffraction (RHEED), x-ray diffraction, and Rutherford backscattering (RBS) measurements all indicate single crystal growth. Analysis of X-ray rocking curves reveals that, over the range of substrate temperatures studied, strain due to the lattice mismatch between ErAs and GaAs is completely inelastically relieved in the 1500A thick ErAs layers. Variable-temperature Hall measurements reveal metallic behaviour in all samples, with no pronounced dependence on substrate temperature. Spectrally narrow (0.6 meV) intra 4f-shell transitions of Er3+ (4f11), at 1.54 μm, have been observed in ErAs epitaxial layers both in absorption (by Fourier transform infra-red spectroscopy, FTIR) and in emission (by cathodoluminescence). The crystal-field splittings observed in the FTIR spectra are consistent with the cubic(O h)symmetry expected for the Er lattice site in unstrained ErAs, in good agreement with the x-ray analyses. |
| Databáze: | OpenAIRE |
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