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

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

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