Transistor Animations Visualize Electron and Hole Movement in BJTs, MOSFETs, and JFETs

Visualizing Transistor Physics

Animations have been developed using a semiconductor simulator to visualize the internal operations of various transistor types. These include NPN Bipolar Junction Transistors (BJTs), n-channel Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), and n-channel Junction Field-Effect Transistors (JFETs). The animations use blue dots for electrons and red dots for holes, with white flashes indicating recombination events.

Depicting Charge Carrier Motion

The initial set of animations shows charge carrier velocity based on combined diffusion and drift currents, divided by total charge, without explicitly showing diffusion. A subsequent set of animations provides a more accurate depiction by including both diffusion and drift, though this can be visually more complex. This approach offers a detailed look at how charge carriers move within the semiconductor devices.

Terminal Currents and Voltages

A final series of animations focuses on the electrical characteristics at the device terminals. These visualizations display the currents and voltages present at each terminal of the NPN BJT, n-ch MOSFET, and n-ch JFET. This provides a comprehensive view of both the internal charge dynamics and the external electrical behavior of these fundamental electronic components.