Semiconductor Simulation Program

This program demonstrates the behavior of semiconductor devices. Click here to load one of the demonstrations and use the mouse to interact.

Tools

• Interact: Click on a voltage source to set its strength.
• Draw: Add material to the field.
• Voltage: Add a voltage probe.
• Current: Click and drag to add a current probe that measures current across a wire.
• Ground: Specifies the point relative to which probes measure voltage (optional).
• Delete probe: Click to delete a probe.
• Replace: Draw over other materials.
• Line: Click and drag to make a line.
• Fill: Fill a region.
• Erase: Erase.
• Select: Click and drag to make a rectangular selection or move it.
• Select region: Click to select a contiguous region.
• Text: Click to place a text cursor and type text on the screen.

Controls

• P/Space: Pause & unpause
• F: Advance frame
• Q: Change brush shape
• C: Toggle material color
• V: Toggle vectors
• S: Toggle scalar colors
• T: Toggle tooltip
• G: Toggle text background
• Mouse wheel: Change brush size
• Shift: Draw straight lines
• Ctrl: Fill area
• Alt/Option: Pick material
• Ctrl-X: Cut
• Ctrl-C: Copy
• Ctrl-V: Paste
• Left mouse: Draw material
• Right mouse: Erase material
• Middle mouse: Pick material

Materials

• Voltage source: Generates a voltage that can be used to power circuits.
• Metal: Conducts electricity very well.
• Conductive metal: More conductive than normal metal.
• Resistive metal: Less conductive than normal metal.
• High workfunction metal: Forms an ohmic contact with p-type semiconductor.
• Low workfunction metal: Forms an ohmic contact with n-type semiconductor.
• Intrinsic semiconductor: Undoped, has equal number of electrons and holes.
• P-type semiconductor: Has more holes than electrons.
• N-type semiconductor: Has more electrons than holes.
• Heavily doped P-type semiconductor: Has many more holes than electrons.
• Heavily doped N-type semiconductor: Has many more electrons than holes.
• Lightly doped P-type semiconductor: Has slightly more holes than electrons.
• Lightly doped N-type semiconductor: Has slightly more electrons than holes.
• Dielectric: Has high relative permittivity, can be used for capacitors.
• Ferromagnet: Has high relative permeability, can be used for inductors.
• Decoration: Inert, can be used for text or circuit symbols.
• Vacuum: Empty space.

Copyright (c) 2025 Brandon Li
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