Assertion: added impurity | /r/HasProperty | electron donors
Facets:
Source sentences:
text: Based on whether the added impurities are electron donors or acceptors, the semiconductor's Fermi level (the energy state below which all allowable energy states are filled and above which all states are empty as the temperature approaches 0 Kelvin) is able to move either up or down from its original position in the center of the energy band gap (the gap between the valence and conduction bands of the semiconductor).