Rheed Observation of Lattice Relaxation During Ge/Si(O01) Heteroepitaxy

1989 ◽  
Vol 148 ◽  
Author(s):  
Kazushi Miki ◽  
Kunihiro Sakamoto ◽  
Tsunenori Sakamoto
Keyword(s):  
Electron Diffraction ◽  
Lattice Constant ◽  
Growth Temperature ◽  
Lattice Relaxation ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Plane Lattice

ABSTRACTWe report the dynamic RHEED (reflection high energy electron diffraction) observation during Ge/Si(001) heteroepitaxy at various growth temperatures. The RHEED intensityanalysis and the in-plane lattice constant analysis reveal a growth fashion and lattice relaxation. Both of them depend strongly on growth temperature.

Slow Decay of Reflection High Energy Electron Diffraction Oscillations in Cal1-xMgxF2

1996 ◽  
Vol 441 ◽  
Author(s):  
Mitsuhiro Kushibe ◽  
Yuriy V. Shusterman ◽  
Nikolai L. Yakovlev ◽  
Leo J. Schowalter
Keyword(s):  
Phase Separation ◽  
Electron Diffraction ◽  
Lattice Constant ◽  
Room Temperature ◽  
High Energy ◽  
Energy Electron ◽  
Scanning Tunneling ◽  
High Energy Electron ◽  
Tunneling Microscopy ◽  
Slow Decay

AbstractMagnesium is incorporated into the growth of Ca1-xMgxF2 to reduce the lattice constant of fluorite (CaF2) which is 0.6% larger than that of Si at room temperature. When grown epitaxially on Si(111) substrates at 300°C, the lattice constant of the alloy became smaller than that of Si by 1.5% when the Mg concentration was around 20%. At higher Mg concentrations, the lattice constant did not decrease any further. This invariability of the lattice constant was caused by a phase separation of the Ca1-xMgxF2 layer into a Mg-rich region and a Mg-deficient region. When the growth temperature was increased, the critical Mg concentration for the phase separation became smaller. When Ca1-xMgxF2 was grown on vicinal Si(111) substrates, the reflection high energy electron diffraction (RHEED) intensity oscillations reflected no change in the composition, suggesting segregation of a Mg-rich phase along the steps. Nevertheless, the oscillations in the intensity of the specular spot for Ca1-xMgxF2 lasted longer than those observed for pure CaF2, suggesting a flatter surface for the alloy. Scanning tunneling microscopy (STM) observations support this model.

In situ analysis of lattice relaxation by reflection high-energy electron diffraction

2005 ◽  
Vol 38 (23) ◽  
pp. 4222-4226 ◽  
Author(s):  
X H Wei ◽  
Y R Li ◽  
J Zhu ◽  
Y Zhang ◽  
Z Liang ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Lattice Relaxation ◽  
High Energy ◽  
Energy Electron ◽  
In Situ Analysis ◽  
High Energy Electron

Kinematic Approximations in TED and RHEED Analysis of Reconstructed Surfaces

1990 ◽  
Vol 48 (2) ◽  
pp. 396-397
Author(s):  
L. -M. Peng ◽  
M. J. Whelan
Keyword(s):  
Electron Diffraction ◽  
Kinematic Analysis ◽  
Incident Beam ◽  
High Energy ◽  
Energy Electron ◽  
Great Success ◽  
High Energy Electron ◽  
Kinematic Approximation ◽  
Reconstructed Surfaces

In recent years there has been a trend in the structure determination of reconstructed surfaces to use high energy electron diffraction techniques, and to employ a kinematic approximation in analyzing the intensities of surface superlattice reflections. Experimentally this is motivated by the great success of the determination of the dimer adatom stacking fault (DAS) structure of the Si(111) 7 × 7 reconstructed surface.While in the case of transmission electron diffraction (TED) the validity of the kinematic approximation has been examined by using multislice calculations for Si and certain incident beam directions, far less has been done in the reflection high energy electron diffraction (RHEED) case. In this paper we aim to provide a thorough Bloch wave analysis of the various diffraction processes involved, and to set criteria on the validity for the kinematic analysis of the intensities of the surface superlattice reflections.The validity of the kinematic analysis, being common to both the TED and RHEED case, relies primarily on two underlying observations, namely (l)the surface superlattice scattering in the selvedge is kinematically dominating, and (2)the superlattice diffracted beams are uncoupled from the fundamental diffracted beams within the bulk.

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