Structure and Optical Properties of Ca Silicide Films and Si/Ca3Si4/Si(111) Heterostructures

2014 ◽  
Vol 213 ◽  
pp. 71-79 ◽  
Author(s):  
Nikolay Gennadievich Galkin ◽  
Dmitrii Aleksandrovich Bezbabnyi ◽  
Sergei Andreevich Dotsenko ◽  
Konstantin Nikolaevich Galkin ◽  
Igor Mikhailovich Chernev ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Interband Transition ◽  
Ex Situ ◽  
Silicide Film ◽  
First Time ◽  
Phonon Structure

Thick, thin films and island of Ca silicide have been grown by Ca deposition onto 500 °C Si (111)7x7 substrates. The crystal structure of the grown layers strongly differs from the known Ca silicides (Ca2Si, CaSi, Ca5Si3, Ca14Si19, CaSi2). The phonon peaks at 389 and 416 cm-1 and the interband transition peaks (0.9-1.0, 1.3-1.7 and 2.0-2.5 eV) belongs to another silicide - Ca3Si4. Peculiarities of crystal, electronic, and phonon structure and optical properties of the grown Ca silicide films were measured by in situ and ex situ methods permit to state that the formed Ca silicide film has a composition Ca3Si4. Heterostructures with embedded Ca3Si4 films with different thicknesses have been formed atop the Ca3Si4 films by MBE and SPE at 500 °C. The observed density of pinholes with different sizes suggests the Si growth atop the Ca silicide follows a 3D mechanism. Photoluminescence was found first time in Si/Ca3Si4/Si (111) heterostructures.

scholarly journals Light filter tailoring – the impact of light emitting diode irradiation on the morphology and optical properties of silver nanoparticles within polyethylenimine thin films

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41603-41609 ◽  
Author(s):  
F. Kemper ◽  
E. Beckert ◽  
R. Eberhardt ◽  
A. Tünnermann
Keyword(s):  
Thin Films ◽  
Silver Nanoparticles ◽  
Optical Properties ◽  
Light Emitting Diode ◽  
Light Filter ◽  
Light Emitting ◽  
Fluorescence Light ◽  
The Impact ◽  
First Time

In this contributionin situemission filter generation for,e.g.fluorescence light detection by morphology tailoring of silver nanoparticles within a polymer layer, is presented for the first time.

The use of transmission and analytical electron microscopy in studying reactions and phase transformations in thin film

1993 ◽  
Vol 51 ◽  
pp. 842-843
Author(s):  
K. Barmak
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Transformations ◽  
Analytical Electron Microscopy ◽  
Ex Situ ◽  
Multilayer Thin Films ◽  
Absolute Concentration ◽  
Analytical Electron ◽  
Deposition Step

Generally, processing of thin films involves several annealing steps in addition to the deposition step. During the annealing steps, diffusion, transformations and reactions take place. In this paper, examples of the use of TEM and AEM for ex situ and in situ studies of reactions and phase transformations in thin films will be presented.The ex situ studies were carried out on Nb/Al multilayer thin films annealed to different stages of reaction. Figure 1 shows a multilayer with dNb = 383 and dAl = 117 nm annealed at 750°C for 4 hours. As can be seen in the micrograph, there are four phases, Nb/Nb3-xAl/Nb2-xAl/NbAl3, present in the film at this stage of the reaction. The composition of each of the four regions marked 1-4 was obtained by EDX analysis. The absolute concentration in each region could not be determined due to the lack of thickness and geometry parameters that were required to make the necessary absorption and fluorescence corrections.

Optical properties and crystal structure of lithium doped Ba0.55Sr0.45TiO3(BLST) thin films

2018 ◽  
Vol 45 (1-3) ◽  
pp. 14-21 ◽  
Author(s):  
Irzaman ◽  
A. Nuraisah ◽  
Aminullah ◽  
K. A. Hamam ◽  
H. Alatas
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties

Microwave Phase Shifters: Epitaxial Growth by Pulsed Laser Deposition of Dielectric Ba0.5Sr0.5TiO3 Thin Films on MgO

2005 ◽  
Vol 902 ◽  
Author(s):  
YauYau Tse ◽  
P. S. Suherman ◽  
T. J. Jackson ◽  
I. P. Jones
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Strain Relaxation ◽  
Pulsed Laser ◽  
Phase Shifters ◽  
Laser Deposition ◽  
Ex Situ ◽  
Misfit Dislocations ◽  
Epitaxial Relationship

AbstractBa0.5Sr0.5TiO3 (BSTO) thin films were grown on (001) MgO using pulsed-laser deposition (PLD). The microstructures of in-situ and ex-situ annealed BSTO films were studied by X-ray diffraction and transmission electron microscopy (TEM). The films showed a cube on cube epitaxial relationship with <100> BSTO // <100> MgO. They were essentially single crystals with a columnar structure and possessed smooth surfaces. The interfaces of the BSTO films and substrates were atomically sharp, with misfit dislocations. Better crystallinity and full strain relaxation was obtained in films grown in 10-1 mbar oxygen and annealed ex-situ. A 30% increase in dielectric tuneability was achieved compared with in-situ annealing and deposition at 10-4 mbar. Threading dislocations are the dominant defects in the films grown in 10-1 mbar oxygen and annealed ex-situ, while the films with in-situ annealing show columnar structures with low angle boundaries.

scholarly journals Ex-situ and in-situ selenization of copper-indium and copper-boron thin films

2008 ◽  
Author(s):  
R. J. Soukup ◽  
N. J. Ianno ◽  
Chad Kamler ◽  
Martin Diaz ◽  
Shuchi Sharma ◽  
...  
Keyword(s):  
Thin Films ◽  
Ex Situ ◽  
Copper Indium
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