Optical diagnostics of InGaAs quantum well in pseudomorphic modulation-doped Al1-xGaxAs/InyGa1-yAs/GaAs heterostructures of less-than-critical layer thickness

2003 ◽  
Author(s):  
Georgiy G. Tarasov ◽  
S. R. Lavorik ◽  
Yu. I. Mazur ◽  
Mikhail Y. Valakh ◽  
Z. Y. Zhuchenko ◽  
...  
Keyword(s):  
Quantum Well ◽  
Layer Thickness ◽  
Optical Diagnostics ◽  
Critical Layer ◽  
Critical Layer Thickness ◽  
Ingaas Quantum Well

Theory of Critical Layer Thickness of Nonconstant Quantum-Well Width Produced by Interdiffusion and its Optoelectronics Consequence

1997 ◽  
Vol 484 ◽  
Author(s):  
Michael C. Y. Chan ◽  
E. Herbert Li
Keyword(s):  
Quantum Well ◽  
Plane Strain ◽  
Layer Thickness ◽  
Diffusion Length ◽  
Critical Layer ◽  
Critical Layer Thickness ◽  
Interdiffusion Process ◽  
Quantum Well Width ◽  
Lattice Matched

AbstractIn this paper, the concept of critical layer thickness is applied to the interdiffused quantum well (DFQW) structure. For the as-grown InGaAs/LnP lattice matched quantum well, the interdiffusion process will induce in-plane strain into the DFQW forming a lattice mismatched system. The relation between the as-grown well width (Lz) and the diffusion length (Ld) for formation of dislocation is presented.

Modulation Structure and Superhardness Effect of VC/TiN Nano-Multilayer Films

2012 ◽  
Vol 184-185 ◽  
pp. 1080-1083
Author(s):  
Jian Ling Yue ◽  
Wei Shi ◽  
Ge Yang Li
Keyword(s):  
Elastic Modulus ◽  
Magnetron Sputtering ◽  
Layer Thickness ◽  
Coherent Structure ◽  
Multilayer Films ◽  
Critical Layer ◽  
Maximum Hardness ◽  
Critical Layer Thickness ◽  
The Relationship

A series of VC/TiN nano-multilayer films with various TiN layer thicknesses were synthesized by magnetron sputtering method. The relationship between the modulation structure and superhardness effect of the multilayer films were investigated. The results reveal that TiN below a critical layer thickness grows coherently with VC layers in multilayers. Correspondingly, the hardness and elastic modulus of the multilayers increase significantly. The maximum hardness and modulus achieved in these multilayers is 40.7GPa and 328GPa.With further increase in the TiN layer thickness, coherent structure of multilayers are destroyed, resulting in a remarkable decrease of hardness and modulus. The superhardness effect of multilayers is related to the three directional strains generated from the coherent structure.

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