Monday, May 21, 2012


This applet shows the simplest model for a semiconductor crystal. It plots the hole and electron densities, letting the user manipulate all the parameters.

This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

Notice that if the Fermi energy raises, the density of electrons in the conduction band and also the density of holes in the valence band raises too. A practical way to raise the Fermi energy is by adding impurities to the crystal.

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