X-ray Characterization of Group III-Nitrides (Al,In,Ga)N

Author(s):  
Alois Krost
Keyword(s):  
X Ray ◽  
2001 ◽  
Vol 3 (3) ◽  
pp. 111-121 ◽  
Author(s):  
Aldo Mele ◽  
Anna Giardini ◽  
Tonia M. Di Palma ◽  
Chiara Flamini ◽  
Hideo Okabe ◽  
...  

The methods of preparation of the group III nitrides AlN, GaN, and InN by laser ablation (i.e. laser sputtering), is here reviewed including studies on their properties. The technique, concerns direct ablation of nitride solid targets by laser to produce a plume which is collected on a substrate. Alternatively nitride deposition is obtained as a result of laser ablation of the metal and subsequent reaction in anNH3atmosphere. Optical multichannel emission spectroscopic analysis, and time of flight (TOF) mass spectrometry have been applied forin situidentification of deposition precursors in the plume moving from the target. Epitaxial AlN, GaN, and InN thin films on various substrates have been grown. X-ray diffraction, scanning electron microscopy, have been used to characterise thin films deposited by these methods.


1997 ◽  
Vol 70 (20) ◽  
pp. 2711-2713 ◽  
Author(s):  
K. Lawniczak-Jablonska ◽  
T. Suski ◽  
Z. Liliental-Weber ◽  
E. M. Gullikson ◽  
J. H. Underwood ◽  
...  

2006 ◽  
Vol 527-529 ◽  
pp. 1489-1492 ◽  
Author(s):  
Donat J. As ◽  
S. Potthast ◽  
J. Schörmann ◽  
S.F. Li ◽  
K. Lischka ◽  
...  

Cubic GaN, AlxGa1-xN/GaN and InyGa1-yN/GaN multiple quantum well (MQW) layers were grown by plasma assisted molecular beam epitaxy on 200 &m thick free standing 3C-SiC substrates. The influence of the surface roughness of the 3C-SiC substrates and the influence of metal coverage during growth are discussed. Optimum growth conditions of c-III nitrides exist, when a one monolayer Ga coverage is formed at the growing surface. The improvement of the structural properties of cubic III-nitride layers and multilayers grown on 3C-SiC substrates is demonstrated by 1 μm thick c-GaN layers with a minimum x-ray rocking curve width of 16 arcmin, and by c-AlGaN/GaN and c-InGaN/GaN MQWs which showed up to five satellite peaks in X-ray diffraction, respectively.


2003 ◽  
Vol 27 (1-2) ◽  
pp. 50-57 ◽  
Author(s):  
Keiji Hayashi ◽  
Takuo Kanayama ◽  
Hideki Kojima ◽  
Toyohiro Shimizu

2003 ◽  
Vol 0 (6) ◽  
pp. 1795-1815 ◽  
Author(s):  
J. Christen ◽  
T. Riemann ◽  
F. Bertram ◽  
D. Rudloff ◽  
P. Fischer ◽  
...  

1999 ◽  
Vol 5 (S2) ◽  
pp. 692-693
Author(s):  
G. Brockt ◽  
H. Lakner

EELS in the low loss region of the spectra (< 50eV) provides information on excitations of outer shell electrons and thus the electronic structure of a specimen material which determines its optical properties. In this work dedicated EELS methods for the experimental acquisition and analysis of spectra are described which give improved information about the electronic structure near the bandgap region at a spatial resolution in the range of nanometers. For this purpose we made use of a cold field emission STEM equipped with a dedicated EELS system. This device provides a subnanometer electron probe and offers an energy resolution of 0.35 eV. Application of suitable deconvolution routines for removal of the zero loss peak extracts information on the closest bandgap region while Kramers-Kronig transformation deduces the dielectric properties from the measured energy loss function. These methods have been applied to characterize the optical properties of wide-bandgap materials for the case of group Ill-nitride compounds which are currently the most promising material for applications on optoelectronic devices working in the blue and ultraviolet spectral range.


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