These sites are filled by Te atoms which are ionized to create additional positive holes.
2.
Due to the generation of positive holes and electrons, oxidation-reduction reactions take place at the surface of semiconductors.
3.
In the oxidative reaction, the positive holes react with the moisture present on the surface and produce a hydroxyl radical.
4.
It is used as well to find the sign of the dominant charge carriers in materials such as semiconductors ( negative electrons or positive holes ).
5.
When a photon with energy equal to or greater than the materials band gap is absorbed by the semiconductor, an electron is excited from the valence band to the conduction band, generating a positive hole in the valence band.
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