From: hackbard <hackbard@sage.physik.uni-augsburg.de>
Date: Sat, 12 Jun 2010 18:13:10 +0000 (+0200)
Subject: finished prec model
X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95b2d1acc7fb1969b13df81cf5c3e0eeea913dff;p=lectures%2Flatex.git

finished prec model
---

diff --git a/posic/talks/seminar_2010.tex b/posic/talks/seminar_2010.tex
index 1224040..67de04d 100644
--- a/posic/talks/seminar_2010.tex
+++ b/posic/talks/seminar_2010.tex
@@ -26,6 +26,8 @@
 \usepackage{graphicx}
 \graphicspath{{../img/}}
 
+\usepackage{miller}
+
 \usepackage[setpagesize=false]{hyperref}
 
 \usepackage{semcolor}
@@ -172,8 +174,8 @@
 }
 
  \begin{itemize}
-  \item Fabrication of silicon carbide and different polytypes
-  \item Precipitation model of 3C-SiC in Si
+  \item Polyteps and fabrication of silicon carbide
+  \item Supposed precipitation mechanism of SiC in Si
   \item Utilized simulation techniques
         \begin{itemize}
          \item Molecular dynamics (MD) simulations
@@ -307,4 +309,131 @@ Thermal conductivity [W/cmK] & 5.0 & 4.9 & 4.9 & 1.5 & 1.3 & 22 \\
 
 \end{slide}
 
+\begin{slide}
+
+ {\large\bf
+  Fabrication of silicon carbide
+ }
+
+ \small
+
+ Alternative approach:
+ Ion beam synthesis (IBS) of burried 3C-SiC layers in Si\hkl(1 0 0)
+ \begin{itemize}
+  \item \underline{Implantation step 1}\\
+        180 keV C$^+$, $D=7.9\times 10^{17}$ cm$^{-2}$, $T_{\text{i}}=500\,^{\circ}\mathrm{C}$\\
+        $\Rightarrow$ box-like distribution of equally sized
+                       and epitactically oriented SiC precipitates
+                       
+  \item \underline{Implantation step 2}\\
+        180 keV C$^+$, $D=0.6\times 10^{17}$ cm$^{-2}$, $T_{\text{i}}=250\,^{\circ}\mathrm{C}$\\
+        $\Rightarrow$ destruction of SiC nanocrystals
+                      in growing amorphous interface layers
+  \item \underline{Annealing}\\
+        $T=1250\,^{\circ}\mathrm{C}$, $t=10\,\text{h}$\\
+        $\Rightarrow$ homogeneous, stoichiometric SiC layer
+                      with sharp interfaces
+ \end{itemize}
+
+ \begin{minipage}{6.3cm}
+ \includegraphics[width=6cm]{ibs_3c-sic.eps}\\[-0.2cm]
+ {\tiny
+  XTEM micrograph of single crystalline 3C-SiC in Si\hkl(1 0 0)
+ }
+ \end{minipage}
+ \begin{minipage}{6.3cm}
+ \begin{center}
+ {\color{blue}\bf\normalsize
+  Precipitation mechanism not yet fully understood!
+ }
+ \renewcommand\labelitemi{$\Rightarrow$}
+ \small
+ \underline{Understanding the SiC precipitation}
+ \begin{itemize}
+  \item significant technological progress in SiC thin film formation
+  \item perspectives for processes relying upon prevention of SiC precipitation
+ \end{itemize}
+ \end{center}
+ \end{minipage}
+ 
+\end{slide}
+
+\begin{slide}
+
+ {\large\bf
+  Supposed precipitation mechanism of SiC in Si
+ }
+
+ \scriptsize
+
+ \vspace{0.1cm}
+
+ \begin{minipage}{3.8cm}
+ Si \& SiC lattice structure\\[0.2cm]
+ \includegraphics[width=3.5cm]{sic_unit_cell.eps}\\[-0.3cm]
+ \hrule
+ \end{minipage}
+ \hspace{0.6cm}
+ \begin{minipage}{3.8cm}
+ \begin{center}
+ \includegraphics[width=3.3cm]{tem_c-si-db.eps}
+ \end{center}
+ \end{minipage}
+ \hspace{0.6cm}
+ \begin{minipage}{3.8cm}
+ \begin{center}
+ \includegraphics[width=3.3cm]{tem_3c-sic.eps}
+ \end{center}
+ \end{minipage}
+
+ \begin{minipage}{4cm}
+ \begin{center}
+ C-Si dimers (dumbbells)\\[-0.1cm]
+ on Si interstitial sites
+ \end{center}
+ \end{minipage}
+ \hspace{0.2cm}
+ \begin{minipage}{4.2cm}
+ \begin{center}
+ Agglomeration of C-Si dumbbells\\[-0.1cm]
+ $\Rightarrow$ dark contrasts
+ \end{center}
+ \end{minipage}
+ \hspace{0.2cm}
+ \begin{minipage}{4cm}
+ \begin{center}
+ Precipitation of 3C-SiC in Si\\[-0.1cm]
+ $\Rightarrow$ Moir\'e fringes\\[-0.1cm]
+ \& release of Si self-interstitials
+ \end{center}
+ \end{minipage}
+
+ \begin{minipage}{3.8cm}
+ \begin{center}
+ \includegraphics[width=3.3cm]{sic_prec_seq_01.eps}
+ \end{center}
+ \end{minipage}
+ \hspace{0.6cm}
+ \begin{minipage}{3.8cm}
+ \begin{center}
+ \includegraphics[width=3.3cm]{sic_prec_seq_02.eps}
+ \end{center}
+ \end{minipage}
+ \hspace{0.6cm}
+ \begin{minipage}{3.8cm}
+ \begin{center}
+ \includegraphics[width=3.3cm]{sic_prec_seq_03.eps}
+ \end{center}
+ \end{minipage}
+
+\begin{pspicture}(0,0)(0,0)
+\psline[linewidth=4pt]{->}(8.5,2)(9.0,2)
+\psellipse[linecolor=blue](11.5,5.8)(0.3,0.5)
+\rput{-20}{\psellipse[linecolor=blue](3.3,8.1)(0.3,0.5)}
+%\rput{-20}{\psellipse[linecolor=blue](6,6.5)(0.3,0.5)}
+\psline[linewidth=4pt]{->}(4.0,2)(4.5,2)
+\end{pspicture}
+ 
+\end{slide}
+
 \end{document}