Cathodoluminescence characterization of suspended GaN nanomembranes
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STEVENS-KALCEFF, MarionA.; TIGINYANU, Ion; POPA, Veaceslav; BRANIŞTE, Tudor; BRENNER, Patrice. Cathodoluminescence characterization of suspended GaN nanomembranes. In: Journal of Applied Physics. 2013, nr. 4(114), p. 0. ISSN 0021-8979.
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Journal of Applied Physics
Numărul 4(114) / 2013 / ISSN 0021-8979

Cathodoluminescence characterization of suspended GaN nanomembranes


DOI: 10.1063/1.4816562
Pag. 0-0

Stevens-Kalceff MarionA.1, Tiginyanu Ion23, Popa Veaceslav3, Branişte Tudor3, Brenner Patrice4
 
1 University of New South Wales,
2 Ghitu Institute of Electronic Engineering and Nanotechnology of the Academy of Sciences of Moldova,
3 Technical University of Moldova,
4 Karlsruhe Institute of Technology (Forschungszentrum Karlsruhe GmbH)
 
Disponibil în IBN: 22 martie 2018


Rezumat

Continuous suspended ∼15 nm thick gallium nitride (GaN) nano-membranes have been investigated using cathodoluminescence microanalysis. The GaN nanomembranes are fabricated by focused ion beam (FIB) pre-treatment of GaN epilayer surfaces followed by photoelectrochemical (PEC) etching. CL microanalysis enables high sensitivity, nanoscale spatial resolution detection of impurities, and defects, and is associated with key features of the suspended GaN nano-membranes. CL spectra and images of the suspended nano-membranes reveal the broad emission band at ∼2.2 eV which is associated with deep acceptor states and the near edge emission at ∼3.4 eV which is associated with free exciton transitions at 295 K. The near edge emission can be resolved into two components, one associated with emission from the nanomembrane and the other associated with CL from underlying GaN transmitted through the nanomembrane. CL spectroscopy gives insight into the physical properties and optical quality of the suspended GaN nano-membranes. Blue shift of the CL near band edge emission indicates that the suspended GaN nanomembranes exhibit the combined effects of quantum confinement and strain.

Cuvinte-cheie
Broad emission bands, Combined effect, Gallium nitrides (GaN), High sensitivity, Nanoscale spatial resolution, Near band edge emissions, Optical qualities, Photoelectrochemical etching