diff --git a/10_mos.tex b/10_mos.tex
new file mode 100644
index 0000000000000000000000000000000000000000..f7ded36911b2c25d354783cf7d95830207e66479
--- /dev/null
+++ b/10_mos.tex
@@ -0,0 +1,3 @@
+\section{MOS structure}
+
+IDKF, lecture hasnt been given yet
\ No newline at end of file
diff --git a/11_mos_devices.tex b/11_mos_devices.tex
new file mode 100644
index 0000000000000000000000000000000000000000..2a5b66487825260b18fca0d8c898284f5d429840
--- /dev/null
+++ b/11_mos_devices.tex
@@ -0,0 +1,14 @@
+\section{MOS-FET}
+\subsection{Capacitance}
+\begin{center}
+    \begin{circuitikz}
+        \draw (0,0) node[above] (Vg){$V_{G}$}
+        to [C,l=$C_{ox}$,o-*] ++(0,-1)  node[right] (vpsi){$\psi_s$}
+        to [C,l=$C_{s}$] ++(0,-1)  node[ground](gnd){}
+        ;
+    \end{circuitikz}
+\end{center}
+\begin{align}
+    \frac{1}{C_G} & = \frac{1}{C_{ox}}+\frac{1}{C_{s}}            \\
+    C_s           & = \frac{\mathrm{d}\,-Q_s}{\mathrm{d}\,\psi_s}
+\end{align}
\ No newline at end of file
diff --git a/semiconductor_summary.tex b/semiconductor_summary.tex
index c9c13c744a30ba29c2665714e8266fd972671e86..3a1d4288bc67e1066db2ad5ea6b8dc20d62d0b7e 100644
--- a/semiconductor_summary.tex
+++ b/semiconductor_summary.tex
@@ -47,4 +47,6 @@
 \include{07_diode_applications}
 \include{08_bjt}
 \include{09_bjt_small_signal}
+\include{10_mos}
+\include{11_mos_devices}
 \end{document}