InAlN/GaN Bragg reflectors grown by plasma-assisted molecular beam epitaxy

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3517138· OSTI ID:21537951

Gacevic, Z; Fernandez-Garrido, S; Calleja, E ^[1]; Hosseini, D; Peiro, F ^[2]; Estrade, S ^[2]

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1. ISOM, Universidad Politecnica de Madrid, Avda Complutense s/n, 28040 Madrid (Spain)
2. Departament d'Electronica, LENS-MIND-IN2UB, Universitat de Barcelona, Marti i Franques 1, 08028 Barcelona (Spain)

We report on molecular beam epitaxy growth and characterization of ten-period lattice-matched InAlN/GaN distributed Bragg reflectors (DBRs), with peak reflectivity centered around 400 nm. Thanks to the well tuned ternary alloy composition, crack-free surfaces have been obtained, as confirmed by both optical and transmission electron microscopy (TEM). Their good periodicity and well-defined interfaces have been confirmed by both x-ray diffraction and TEM measurements. Peak reflectivity values as high as 60% with stop bands of 30 nm have been demonstrated. Optical measurements revealed that discrepancy between the obtained (60%) and the theoretically expected ({approx}75%) reflectivity is a consequence of significant residual absorption ({approx}35%). TEM measurements revealed the coexistence of zinc-blende and wurtzite phases, as well as planar defects, mainly in GaN. These defects are suggested as the potential source of the undesired absorption and/or scattering effects that lowered the DBRs' peak reflectivity.

• OSTI ID: 21537951
• Journal Information: Journal of Applied Physics, Vol. 108, Issue 11; Other Information: DOI: 10.1063/1.3517138; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ALUMINIUM COMPOUNDS
BRAGG REFLECTION
CRACKS
CRYSTAL DEFECTS
GALLIUM NITRIDES
GRATINGS
INDIUM COMPOUNDS
INTERFACES
MOLECULAR BEAM EPITAXY
NITROGEN COMPOUNDS
PERIODICITY
PLASMA
REFLECTIVITY
SURFACES
TERNARY ALLOY SYSTEMS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALLOY SYSTEMS
COHERENT SCATTERING
CRYSTAL GROWTH METHODS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON MICROSCOPY
EPITAXY
GALLIUM COMPOUNDS
MICROSCOPY
NITRIDES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PNICTIDES
REFLECTION
SCATTERING
SORPTION
SURFACE PROPERTIES
VARIATIONS