% 2024 de DL9MJ
\begin{circuitikz}
    \draw(0,0) -- ++(3,0);
    \fill[DARCred!50] (3,-1) rectangle ++(1.5,2);
    \fill[DARCgray] (4.5,-1) rectangle ++(0.5,2);
    \fill[DARCblue!30](5.5,-1) rectangle ++(1.5,2);
    \fill[DARCgray] (5,-1) rectangle ++(0.5,2);
    \draw[DARCred, -Triangle]  (4.5,0.75) -- (5.75,0.75);
    \draw[DARCblue, -Triangle] (5.5,0.50) -- (4.25,0.5);
    \draw[DARCorange, -Triangle]  (5.5,-0.75) -- (4.5,-0.75);
    \draw(5,1.5) node[](){\footnotesize Diffusion};
    \draw(3,-1) rectangle ++(2,2);
    \draw(5,-1) rectangle ++(2,2);
    \draw(7,0) -- ++(3,0);
    \draw (4,1.5) node[](){\Large P};
    \draw (6,1.5) node[](){\Large N};
    % Löcher
    \draw[DARCred, very thick] (3.5, 0.5) circle (3pt);
    \draw[DARCred, very thick] (4.0, 0.5) circle (3pt);
    \draw[DARCred, very thick] (3.5, 0.0) circle (3pt);
    \draw[DARCred, very thick] (4.0, 0.0) circle (3pt);
    \draw[DARCred, very thick] (3.5,-0.5) circle (3pt);
    \draw[DARCred, very thick] (4.0,-0.5) circle (3pt);
    % Elektronen
    \fill[DARCblue, very thick] (6.0, 0.5) circle (3pt);
    \fill[DARCblue, very thick] (6.5, 0.5) circle (3pt);
    \fill[DARCblue, very thick] (6.0, 0.0) circle (3pt);
    \fill[DARCblue, very thick] (6.5, 0.0) circle (3pt);
    \fill[DARCblue, very thick] (6.0,-0.5) circle (3pt);
    \fill[DARCblue, very thick] (6.5,-0.5) circle (3pt);
    % Ionen:
    \draw[DARCred,  very thick] (5.25,-0.0) node[](){\textcolor{DARCred}{$+$}};
    \draw[DARCblue, very thick] (4.75,-0.0) node[](){\textcolor{DARCblue}{$-$}};
    % E
    \draw(5,-0.5) node[fill=DARCgray](){\textcolor{DARCorange}{$E$}};
    %
    \draw(4.0,-2) to [stroke diode] ++ (2,0);
\end{circuitikz}