\begin{tikzpicture}

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%% My Customized Styles
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%% My Customized Components
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\newcommand{\metalone}{[pattern= horizontal lines, pattern color=blue]}
\newcommand{\metaltwo}{[pattern= vertical lines, pattern color=purple]}
\newcommand{\poly}{[pattern= grid, pattern color=red]}
\newcommand{\pdiff}{[pattern= north east lines, pattern color=orange]}
\newcommand{\ndiff}{[pattern= north west lines, pattern color=green]}
\newcommand{\pwell}{[pattern= crosshatch dots, pattern color=orange]}
\newcommand{\nwell}{[pattern= crosshatch dots, pattern color=green]}
\newcommand{\oxide}{[pattern = bricks, pattern color = olive]}
\newcommand{\silicon}{[fill = white]}
\newcommand{\metalthree}{[fill = teal]}

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%% Schematic
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% General n-type MOSFET scheme
\begin{scope}[shift={(0,0)},scale=0.75]
    \draw \pdiff (0,.25) -- (0,3) -- (1,3) -- (1,2.5) to [out=270,in=180] (1.5,2) -- (3.75,2) to [out=0,in=270] (4.25,2.5) -- (4.25,3) -- (6.75,3) -- (6.75,2.5) to [out=270,in=180] (7.25,2) -- (9.5,2) to [out=0,in=270] (10,2.5) -- (10,3) -- (11,3) -- (11,.25) -- (0,.25) node [midway,above] {p doped Si};
    \draw \metalthree (0,0) rectangle (11,.25) node [midway, color=white]
     {Si Substrate};
    \draw \oxide (4,3) rectangle (7,4) node [pos=.5,font=\bf\Large] {oxide};
    \draw \metalone (4,4) rectangle (7,4.5);
    \draw \ndiff (4.25,3) -- (1,3) -- (1,2.5) to [out=270,in=180] (1.5,2) -- (3.75,2) to [out=0,in=270] (4.25,2.5) -- (4.25,3) node at (2.625,2.5) [align=center] {n-type};
    \draw \ndiff (10,3) -- (6.75,3) -- (6.75,2.5) to [out=270,in=180] (7.25,2) -- (9.5,2) to [out=0,in=270] (10,2.5) -- (10,3) node at (8.375,2.5) [align=center] {n-type};
    \draw \metalone (1.25,3) rectangle (3,3.5);
    \draw \metalone (8,3) rectangle (9.75,3.5);

    % Label the metal connections on MOSFET
    \draw [->] (1,5) node [above] {Source} -- (2.125,3.5);
    \draw [->] (10,5) node [above] {Drain} -- (8.975,3.5);
    \draw [->] (5.5,5) node [above] {Gate} -- (5.5,4.5);

    \node at (5.5,-.5) [align=center] {$V_{GS} \geq V_{threshold}$};
    \node at (5.5,-1) [align=center] {$V_{DS} > V_{GS} - V_{threshold}$};

    \draw [fill=orange,orange] (4.25,3) rectangle (6.75,2.5);
    \draw [fill=white] (4.25,3) -- (4.25,2.85) -- (6.75,3) -- (4.75,3);
    \draw \ndiff (4.25,3) -- (4.25,2.85) -- (6.75,3) -- (4.75,3);
\end{scope}

% General n-type MOSFET part
\begin{scope}[shift={(12,1)}]
    \ctikzset{tripoles/mos style/arrows}
    \draw(-1.5,1.5) node[anchor=south](S){Source};
    \draw(0,1.5) node[anchor=south](G){Gate};
    \draw(1.5,1.5) node[anchor=south](D){Drain};
    \draw (0,0) node [nmos,rotate=-90](Q1){\rotatebox[origin=c]{90}{n-type MOSFET}};
    \draw[line width=1.0pt,-o] (Q1.S) -| (S);
    \draw[line width=1.0pt,-o] (Q1.G) -| (G);
    \draw[line width=1.0pt,-o] (Q1.D) -| (D);
\end{scope}

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\end{tikzpicture}

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