Optical studies of lattice-matched and strained GaInAs/AlInAs single quantum wells

A. Tabata; S. Moneger; Taha Benyattou; Y. Baltagi; Gerard Guillot; Alexandros Georgakilas; K. Zekentes; G. Halkias

doi:10.1117/12.60444

1 July 1992 Optical studies of lattice-matched and strained GaInAs/AlInAs single quantum wells

A. Tabata, S. Moneger, Taha Benyattou, Y. Baltagi, Gerard Guillot, Alexandros Georgakilas, K. Zekentes, G. Halkias

Proceedings Volume 1678, Spectroscopic Characterization Techniques for Semiconductor Technology IV; (1992) https://doi.org/10.1117/12.60444
Event: Semiconductors '92, 1992, Somerset, NJ, United States

Abstract

Photoconductivity (PC), photoluminescence (PL), and photoreflectance (PR) have been carried out on In_0.52Al_0.48As/In_xGa_1-xAs single quantum wells, in lattice matched and lattice mismatched composition. The unstrained (x_In equals 0.53) and the strained (x_In equals 0.60) samples have been grown by molecular beam epitaxy (MBE), with well thicknesses of 5 nm and 25 nm. Low temperature PL measurements have shown a narrow full width at half maximum (FWHM) for the unstrained samples, indicating a very good interface quality. In strained samples a broadening on the FWHM has been found, indicating a small degradation of the structure quality with the introduction of strain. With the PC and PR measurements we have been able to observe transitions between electron and heavy holes levels (E_iH_i) up to i equals 5 and also between the first electron and light holes levels (E₁L₁). We have then calculated the theoretical values of these transitions by solving the Schroedinger equation in a finite square well, using an envelope function approximation, an effective mass approximation, and including the effects of strain on the band structure and on the effective mass. For the lattice matched composition, the best fit is obtained for conduction band offset (Delta) Ec equals 0.50 +/- 0.05 eV, in agreement with the literature. For example, with x_In equals 0.60 composition the best fit is obtained for (Delta) Ec equals 0.55 +/- 0.05 eV, in agreement with theory which predicts that (Delta) Ec increases with indium content.

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A. Tabata, S. Moneger, Taha Benyattou, Y. Baltagi, Gerard Guillot, Alexandros Georgakilas, K. Zekentes, and G. Halkias "Optical studies of lattice-matched and strained GaInAs/AlInAs single quantum wells", Proc. SPIE 1678, Spectroscopic Characterization Techniques for Semiconductor Technology IV, (1 July 1992); https://doi.org/10.1117/12.60444

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