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An electric current is the flow of electric charge: charge in motion. The charges can be electrons, ions, etc. movingi in a solid, liquid, gas.

When dealing with semiconductors the concept of hole is introduced. I understand that only the electrons are moving and the constitute the real, actual particles. Holes are just a vacancy of electrons and have positive charge.

The concept of hole must have been introduced because of some mathematical convenience in dealing with energy levels discussions, etc... I would like to appreciate a little more why the concept of hole was introduced. It must make life easier or some explanations more clear...

Can anyone add any further conceptual explanation of why the concept of hole is so useful? If we only used electrons, would the theory become really mathematically untreatable?

thanks,

fog37

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# Holes as positive charge carriers in semiconductors

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