Cowern's Experiment Simulation Using PLS Model

advdifex02.in : Cowern's Experiment Simulation Using PLS Model

Requires: SSuprem 4 with DIFSIM Module
Minimum Versions: Athena 5.21.2.R

This example shows the ability of the advanced diffusion model to handle Interstitial Cluster (IC) kinetics.

In order to validate the IC model, we simulate the experimental data obtained by Cowern et al . This experiment consists of observing the diffusivity of two boron marker layers after a silicon implantation at 40 keV to a dose of 2E13 atoms/cm^2. From these observations, Cowern has estimated the diffusion enhancement and the evolution of Interstitial supersaturation with time. From the experimental point of view, this quantity can be related to the boron diffusion enhancement with respect to its thermal equilibrium diffusion.

The surpersaturation evolution curve exhibits three parts:

1. The first step characterized by a high supersaturation value (first run of the simulation) corresponds to a large acceleration of the dopant diffusion and can be explained by the presence of small clusters .

2. The second step, exhibits a plateau slightly decreasing with time. It is explained by the competitive growth between {311} defects, known as the Ostwald ripening phenomena. Diffusion acceleration remains constant during this plateau.

3. The third step, characterized by the supersaturation collapse, is explained by the entire dissolution of the Interstitial Cluster population due to the recombination at the surface.

In order to represent two boron markers obtained by epitaxy in Cowern's experiment, two implants with calibrated moments are used in the example. The initial interstitial profile generated by the silicon implant in the experiment is implemented into simulation by the PROFILE statement with the advdifex02.dat file.

To activate the new advanced diffusion model, specify PLS IC in the METHOD statement before the diffusion step, to take into account both Classical Dopant Diffusion (CDD) and IC models.

To load and run this example, select Load example button. This action will copy all associated files to your current working directory. Select the Deckbuild run button to execute the example.