Optical properties of Si1-xGex quantum wells and superlattices grown by rapid thermal chemical vapor deposition

1992 ◽  
Author(s):  
James C. Sturm ◽  
Xiaodong Xiao ◽  
H. Manoharan ◽  
P. V. Schwartz
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Quantum Wells ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Thermal Chemical Vapor Deposition

Structural and Optical Properties of Sigec Alloys and Multi-Quantum Wells Grown by Rapid Thermal Chemical Vapor Deposition

1995 ◽  
Vol 379 ◽  
Author(s):  
P. Boucaud ◽  
C. Guedj ◽  
F. H. Julien ◽  
D. Bouchier ◽  
J. Boulmer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Quantum Wells ◽  
Vapor Deposition ◽  
Deep Level ◽  
Chemical Vapor ◽  
Localized States ◽  
Structural And Optical Properties ◽  
Thermal Chemical Vapor Deposition ◽  
Strong Segregation

ABSTRACTWe have investigated structural and optical properties of SiGeC layers. Bulk and multiquantum wells heterostructures were grown by rapid thermal chemical vapor deposition. The photoluminescence of these structures exhibits two distinct features : deep level photoluminescence associated with localized states and bandedge photoluminescence which gives an indication of the band gap variation due to carbon incorporation in substitutional sites. In the case of multiquantum wells heterostructures, a strong segregation is reported as the growth temperature is decreased. An alternate technique to incorporate carbon in SiGe layers, the pulsed laser induced epitaxy with an excimer laser, is presented. The incorporation of carbon in substitutional sites is evidenced by Raman spectroscopy. As the laser flux is increased, new Raman lines associated to carbon-induced disorder are observed in the spectra.

Structural and Optical Properties of ZnO Nanotetrapods Deposited by Thermal Chemical Vapor Deposition with Different Gas Flow Rate

2015 ◽  
Vol 1109 ◽  
pp. 456-460
Author(s):  
Najwa Ezira Ahmed Azhar ◽  
Shafinaz Sobihana Shariffudin ◽  
Aimi Bazilah Rosli ◽  
A.K.S. Shafura ◽  
Mohamad Rusop
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Flow Rate ◽  
Vapor Deposition ◽  
Gas Flow ◽  
Chemical Vapor ◽  
Gas Flow Rate ◽  
Structural And Optical Properties ◽  
Thermal Chemical Vapor Deposition ◽  
Yellow Orange

ZnO nanotetrapod with different oxygen flow rate was prepared by thermal chemical vapor deposition. We have successfully deposited ZnO nanotetrapod on synthesis Zn powder using double furnace with argon (Ar) and oxygen (O2) gas as source material. In this study, we report the effect of different gas flow rate (5 sccm to 15 sccm) on structural and optical properties of the ZnO nanotetrapod. The morphology of ZnO nanotetrapods were analyzed by field emission scanning electron microscope (FE-SEM). It exhibits the length of the nanotetrapods arm decrease with increased of flow rate and diameter of nanotetrapod in range 30 nm to 90 nm. The optical properties were determined through XRD and photoluminescence with 2θ (30o to 80o) and wavelength 350 nm to 620 nm respectively. PL spectra show that the UV emission centred at 380 nm while yellow-orange emission centred at 540 nm.

Well-Resolved Band-Edge Photoluminescence from Strained Si1–xGex Layers Grown by Rapid Thermal Chemical Vapor Deposition

1991 ◽  
Vol 220 ◽  
Author(s):  
J. C. Sturm ◽  
P. V. Schwartz ◽  
H. Manoharan ◽  
Q. Mi ◽  
L. C. Lenchyshyn ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Quantum Wells ◽  
Vapor Deposition ◽  
Silicon Germanium ◽  
Chemical Vapor ◽  
Band Edge ◽  
Strained Layers ◽  
Alloy Scattering ◽  
Thermal Chemical Vapor Deposition ◽  
Band Edge Luminescence

ABSTRACTWell resolved band-edge luminescence of excitons in silicon-germanium alloy strained layers, quantum wells, and superlattices has been observed in films grown by Rapid Thermal Chemical Vapor Deposition. The signal is due to bound excitons at low temperatures and free excitons at higher temperatures, and has a strong no-phonon signal which is caused by alloy scattering. Bandgaps inferred from photoluminescence agree well with those measured by absorption spectroscopy, inferring that a no-phonon process dominates the band-edge absorption.

Structural and optical properties of graphene from green carbon source via thermal chemical vapor deposition

2016 ◽  
Vol 31 (13) ◽  
pp. 1947-1956 ◽  
Author(s):  
M.J. Salifairus ◽  
S.B. Abd Hamid ◽  
T. Soga ◽  
Salman A.H. Alrokayan ◽  
Haseeb A. Khan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Vapor Deposition ◽  
Carbon Source ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Structural And Optical Properties ◽  
Thermal Chemical Vapor Deposition ◽  
Image Position

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