Selective etching of (111)B-oriented \(Al_x Ga_{1-x} As\)-layers for epitaxial lift-off

GaAs-(111)-nanostructures exhibiting second harmonic generation are new building blocks in nonlinear optics. Such structures can be fabricated through epitaxial lift-off employing selective etching of Al-containing layers and subsequent transfer to glass substrates. In this article, the selective et...

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Bibliographic Details
Published in:arXiv.org 2021-03
Main Authors: Henksmeier, Tobias, Eppinger, Martin, Reineke, Bernhard, Zentgraf, Thomas, Meier, Cedrik, Reuter, Dirk
Format: Article
Language:English
Subjects:
Aluminum
Atomic force microscopy
Epitaxy
Etching
Gallium arsenide
Glass substrates
Hydrofluoric acid
Nonlinear optics
Second harmonic generation
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Summary:GaAs-(111)-nanostructures exhibiting second harmonic generation are new building blocks in nonlinear optics. Such structures can be fabricated through epitaxial lift-off employing selective etching of Al-containing layers and subsequent transfer to glass substrates. In this article, the selective etching of (111)B-oriented \(Al_x Ga_{1-x}As\) sacrificial layers (10 nm to 50 nm thick) with different aluminum concentrations (x=0.5 to 1.0) in 10 % hydrofluoric acid is investigated and compared to standard (100)-oriented structures. The thinner the sacrificial layer and the lower the aluminum content, the lower the lateral etch rate. For both orientations, the lateral etch rates are in the same order of magnitude, but some quantitative differences exist. Furthermore, the epitaxial lift-off, the transfer, and the nano-patterning of thin (111)B-oriented GaAs membranes is demonstrated. Atomic force microscopy and high-resolution x-ray diffraction measurements reveal the high structural quality of the transferred GaAs-(111) films.
ISSN:2331-8422
DOI:10.48550/arxiv.2103.02466