N-type semiconductors have five or more electrons in their outer valence ring.

Name: N-type semiconductors have five or more electrons in their outer valence ring.
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N-type semiconductors are doped with impurities such as phosphorus, which have five valence electrons. When phosphorus substitutes for a silicon atom in the crystal lattice, it creates an extra electron in the conduction band, making the semiconductor an N-type.

N-Type Semiconductors Have Five or More Electrons in Their Outer