Precipitation of Copper and Cobalt at Grain Boundaries in Silicon

1989 ◽  
Vol 163 ◽  
Author(s):  
U. Jendrich ◽  
H. J. Möller
Keyword(s):  
Particle Size ◽  
Mössbauer Spectroscopy ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Cooling Rate ◽  
Polycrystalline Silicon ◽  
Mossbauer Spectroscopy ◽  
Low Energy ◽  
Surface Source ◽  
Mößbauer Spectroscopy

AbstractThe precipitation of copper and (radioactive) cobalt at low energy grain boundaries in polycrystalline silicon and bicrystals is investigated. The metals are diffused in from a surface source between 800 - 1000 °C and the precipitation after cooling down is studied by TEM (for Cu) and Mößbauer spectroscopy (for Co). The precipitates are metal suicides. For copper it is shown that they appear in form of colonies containing hundreds of precipitates with a particle size between 5-60 nm. In the grain boundary they nucleate preferentially at dislocations and steps. The distribution and size of the precipitates depend on the cooling rate after the diffusion. In the vicinity of the grain boundary the volume is depleted from the impurities.

The Precipitation of Nickel and Copper at Grain Boundaries in Silicon

1990 ◽  
Vol 209 ◽  
Author(s):  
H. J. Möller ◽  
U. Jendrich ◽  
L. Huang ◽  
A. Foitzik
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Cooling Rate ◽  
Point Defects ◽  
Polycrystalline Silicon ◽  
Three Dimensional ◽  
Surface Source ◽  
Native Point Defects ◽  
Micrometer Size

ABSTRACTThe precipitation of copper and nickel at grain boundaries in cast polycrystalline silicon is investigated. The metals are diffused into the specimens from a surface source between 800 – 1000 °C and the precipitation after cooling is studied by TEM. Copper precipitates in form of colonies containing hundreds of particles with a size between 5–6 nm. In the grain boundary they nucleate preferentially at dislocations and steps. The distribution and size of the precipitates depend on the cooling rate after the diffusion. Nickel forms only few large (micrometer size) plate-like or three dimensional precipitates at and near grain boundaries. The main features of the results and the differences between the two elements are explained under the assumption that the precipitation requires the transport of native point defects.

Surface sensitivity of low energy electron Mössbauer spectroscopy (LEEMS) using57Fe

1992 ◽  
Vol 69 (1-4) ◽  
pp. 819-822 ◽  
Author(s):  
G. Klingelhöfer ◽  
U. Imkeller ◽  
E. Kankeleit ◽  
B. Stahl
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Low Energy ◽  
Energy Electron ◽  
Surface Sensitivity ◽  
Mößbauer Spectroscopy ◽  
Low Energy Electron
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