6. Glossary

Forbidden band; bandgap

The term "gap" is used in semiconductor physics to describe the valence and conduction bands of semiconductors. Between the two bands there is an energy interval in which a charge carrier cannot find its way: this is the band gap. The energy gap between the two bands is called the gap.

Silicium multicristallin; Multicrystalline silicon

Silicon wafer made up of several grains ranging in size from a few millimetres to a few centimetres.

Heterojunction; Hétérojonction

Junction consisting of two materials with different structural properties. For example, amorphous silicon on crystalline silicon, or gallium arsenide on germanium.