The Effect of Compound Composition and Strain on Vacancies in Si/SiGe Heterostructures

2005 ◽  
Vol 108-109 ◽  
pp. 457-462 ◽  
Author(s):  
Mariya G. Ganchenkova ◽  
V.A. Borodin ◽  
S. Nicolaysen ◽  
Risto M. Nieminen

In this paper we study the effect of chemical environment and elastic strains, which can arise in layered heterostructures due to the lattice parameter mismatch, on the vacancy formation energy in random Si-Ge compounds. Ab initio calculations demonstrate a number of simple trends characterizing the vacancy formation energy dependence on vacancy charge, the number of Ge atoms in its neighbourhood and on the magnitude of elastic strains. The obtained parameters of vacancy-germanium interaction indicate, in particular, a tendency for preferential vacancy accumulation in SiGe region of Si/SiGe/Si layered structures, which is confirmed here by Monte- Carlo simulation of high-temperature vacancy annealing and agrees well with recent experimental observations.

2018 ◽  
Author(s):  
V. P. Saleel Ahammad Saleel ◽  
R. D. Eithiraj

2021 ◽  
Vol 880 ◽  
pp. 43-48
Author(s):  
Yuri N. Starodubtsev ◽  
V.S. Tsepelev

We investigated the relationship of the vacancy formation energy with kinematic viscosity and self-diffusion coefficient in liquid metals at the melting temperature. Formulas are obtained that relate experimental values of the vacancy formation energy, kinematic viscosity, and self-diffusion coefficient to the atomic size and mass, the melting and Debye temperatures. The viscosity and self-diffusion parameters are introduced. The ratio of these parameters to vacancy formation energy is equal to dimensionless constants. It is shown that the formulas for viscosity and self-diffusion differ only in dimensionless constants; the values of these constants are calculated. Linear regression analysis was carried out and formulas with the highest adjusted coefficient of determination were identified. The calculated values of the self-diffusion coefficient for a large number of liquid metals are presented.


2020 ◽  
Vol 124 (19) ◽  
pp. 10509-10522 ◽  
Author(s):  
Yoyo Hinuma ◽  
Takashi Kamachi ◽  
Nobutsugu Hamamoto ◽  
Motoshi Takao ◽  
Takashi Toyao ◽  
...  

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