%
% special format, scaled by 2.82 -> A0
%
-\def\breite{390mm}
-\def\hoehe{319.2mm}
-\def\anzspalten{4}
+% A4 landscape (?)
+%
+%\def\breite{390mm}
+%\def\hoehe{319.2mm}
+%\def\anzspalten{4}
%
% A3 landscape
%
%\def\hoehe{297mm}
%\def\anzspalten{2}
%
+% A0 portrait
+%
+%\def\breite{841mm}
+%\def\hoehe{1189mm}
+%\def\anzspalten{3}
+%
+% A0 / 2.82 portrait
+%
+\def\breite{298.23mm}
+\def\hoehe{421.63mm}
+\def\anzspalten{3}
+%
%
%
% scaling procedure:
}
% header
-\vfill
+%\vfill
\hfill
\psshadowbox{\makebox[0.95\textwidth]{%
- \hfill
- \parbox[c]{0.1\linewidth}{\includegraphics[height=4.5cm]{uni-logo.eps}}
- \parbox[c]{0.7\linewidth}{%
+ %\hfill
+ \parbox[c]{0.15\linewidth}{\includegraphics[height=4.5cm]{uni-logo.eps}}
+ \parbox[c]{0.62\linewidth}{%
\begin{center}
- \textbf{\Huge{Monte Carlo simulation study of a
- selforganization process\\
+ \textbf{\Huge{Monte Carlo simulation study \\
+ of a selforganization process \\
leading to ordered precipitate structures}
}\\[0.7em]
\textsc{\LARGE \underline{F. Zirkelbach}, M. H"aberlen,
}
\end{center}
}
- \parbox[c]{0.1\linewidth}{%
+ \parbox[c]{0.15\linewidth}{%
\includegraphics[height=4.1cm]{Lehrstuhl-Logo.eps}
}
- \hfill
+ %\hfill
}}
-\hfill\mbox{}\\[0.5cm]
+\hfill\mbox{}\\[0cm]
%\vspace*{1.3cm}
\parbox[t][\textheight]{1.3\textwidth}{%
%\vspace*{0.2cm}
\hfill
+ %\hspace{0.5cm}
% first column
\begin{spalte}
\begin{kasten}
$\rightarrow$ {\bf amourphous} precipitates
\item $20 - 30\,\%$ lower silicon density of $a-SiC_x$ compared to $c-Si$\\
$\rightarrow$ {\bf lateral strain} (black arrows)
+\item implantation range near surface\\
+ $\rightarrow$ {\bf ralaxation} of {\bf vertical strain component}
\item reduction of the carbon supersaturation in $c-Si$\\
$\rightarrow$ {\bf carbon diffusion} into amorphous volumina
(white arrows)
-\item lateral strain (vertical component relaxating)\\
+\item remaining lateral strain\\
$\rightarrow$ {\bf strain induced} lateral amorphization
\end{itemize}
\end{kasten}
-\end{spalte}
-\begin{spalte}
\begin{kasten}
\section*{3 \hspace{0.1cm} {\color{blue}Simulation}}
\begin{center}
\includegraphics[width=6cm]{gitter_e.eps}
\end{center}
+ Periodic boundary conditions in $x,y$-direction.\\
+ Start conditions: All volumes crystalline, zero carbon
+ concentration.
+ \subsection*{3.3 {\color{blue} TRIM collision statistics}}
+ \begin{center}
+ \includegraphics[width=8cm]{trim_coll_e.eps}
+ \end{center}
+ \begin{center}
+ $\Rightarrow$ mean constant energy loss per collision of an ion
+ \end{center}
+ \end{kasten}
+\end{spalte}
+\begin{spalte}
+ \begin{kasten}
\subsection*{3.2 {\color{blue} Simulation algorithm}}
\subsubsection*{3.2.1 Amorphization/Recrystallization}
\begin{itemize}
- \item random numbers according to the nuclear
- energy loss to determine the volume hit
- by an impinging ion
+ \item random numbers distributed according to
+ the nuclear energy loss to determine the
+ volume hit by an impinging ion
\item compute local probability for
amorphization:\\
\[
\subsubsection*{3.2.2 Carbon incorporation}
\begin{itemize}
- \item random numbers according to the
- implantation profile to determine the
+ \item random numbers distributed according to
+ the implantation profile to determine the
incorporation volume
\item increase the amount of carbon atoms in
that volume
removal
\end{itemize}
- \subsection*{3.3 {\color{blue} TRIM collision statistics}}
- \begin{center}
- \includegraphics[width=8cm]{trim_coll_e.eps}
- \end{center}
- \begin{center}
- $\Rightarrow$ mean constant energy loss per collision of an ion
- \end{center}
\end{kasten}
-\end{spalte}
-\begin{spalte}
\begin{kasten}
\section*{4 \hspace{0.1cm} {\color{blue}Simulation results}}
\begin{center}
\includegraphics[width=11cm]{dosis_entwicklung_ng_e_2-2.eps}
\end{center}
+ Simulation parameters:\\
+ $p_b=0.01$, $p_c=0.001$, $p_s=0.0001$, $d_r=0.05$,
+ $d_v=1 \times 10^6$.
\end{kasten}
\begin{kasten}
- \subsection*{4.2 {\color{blue} Carbon distribution}}
+ \subsection*{4.2 {\color{blue} Variation of the simulation parameters}}
\begin{center}
- \includegraphics[width=11cm]{ac_cconc_ver2_e.eps}
+ \includegraphics[width=11cm]{var_sim_paramters_en.eps}
\end{center}
-
+ Parameters of initial situation:\\
+ $p_b=0.01$, $p_c=0.001$, $p_s=0.0001$, $d_r=0.05$,
+ $d_v=1 \times 10^6$.
\end{kasten}
\end{spalte}
-% fourth column
\begin{spalte}
\begin{kasten}
- \subsection*{4.3 {\color{blue} More structural/compositional
+ \subsection*{4.3 {\color{blue} Carbon distribution}}
+ \begin{center}
+ \includegraphics[width=11cm]{ac_cconc_ver2_e.eps}
+ \end{center}
+
+ \end{kasten}
+ \begin{kasten}
+ \subsection*{4.4 {\color{blue} More structural/compositional
information}}
\begin{center}
\includegraphics[width=8cm]{97_98_ng_e.eps} \\
\end{center}
\end{kasten}
\begin{kasten}
- \subsection*{4.4 \hspace{0.1cm} {\color{blue} Broad distribution
+ \subsection*{4.5 \hspace{0.1cm} {\color{blue} Broad distribution
of lamellar structure - the recipe}}
- \subsubsection*{4.4.1 Constant carbon concentration}
+ \subsubsection*{4.5.1 Constant carbon concentration}
\makebox[11cm]{%
\parbox[c]{5cm}{%
\begin{itemize}
- \item multiple implantation \\ steps
+ \item multiple implantation\\
+ steps
\item energies: $180$ - $10 \, keV$
- \item higher temeprature\\
+ \item temeprature: $500 ^{\circ} \mathrm{C}$\\
$\rightarrow$ prevent amorphization
\end{itemize}
$\Rightarrow$ nearly constant carbon distribution
\includegraphics[width=6cm]{multiple_impl_cp_e.eps}
}
}
- \subsubsection*{4.4.2 2 MeV C$^+$ implantation
+ \subsubsection*{4.5.2 2 MeV C$^+$ implantation
step}
\begin{center}
\includegraphics[width=10cm]{multiple_impl_e.eps}
\end{center}
+ Starting point for materials with high photoluminescence.\\
+ Dihu Chen et al. Opt. Mater. 23 (2003) 65.
\end{kasten}
\begin{kasten}
- \section*{5 \hspace{0.1cm} {\color{red} Conclusions}}
+ \section*{5 \hspace{0.1cm} {\color{red} Conclusion}}
\begin{itemize}
\item selforganized nanometric precipitates by ion irradiation
\item model describing the seoforganization process
- \item precipitate structures traceable by simulation
+ \item set of parameters reproducing the experimental observations
+ \item precipitation process traceable by simulation
\item detailed structural/compositional information
\item recipe for broad distributions of lamellar structure
\end{itemize}
projects / lectures / latex.git / blobdiff