Chemistry Practice Problems Atomic, Ionic, and Molecular Solids Practice Problems Solution: Explain how doping silicon with either phosphorus ...

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Solution: Explain how doping silicon with either phosphorus or gallium increases the electrical conductivity over that of pure silicon.

Problem

Explain how doping silicon with either phosphorus or gallium increases the electrical conductivity over that of pure silicon.

Solution

Silicon is a Group 4A element. It has 4 valence electrons. Pure silicon will use these 4 electrons to form a network with other silicon atoms as shown below:

All the electrons of Si are paired (through more networks of Si atoms). Hence, it is not very conductive at its pure state.

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