What is a conductive material which contains extra "holes"?

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SUMMARY

The discussion focuses on the nature of conductive materials, specifically identifying semiconductors as materials that contain extra "holes" which act as charge carriers. Unlike conductors such as copper (Cu), which have tightly bound electrons and no unfilled holes, semiconductors possess a unique structure that allows for the presence of these holes. This characteristic enables semiconductors to conduct electricity under certain conditions, making them essential in electronic applications.

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There are conductors with loosely bound electrons such as Cu, what is a conductor that contains loosely bound "holes"?
 
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Charge carriers are a phenomena of semi-conductors. Conductors like copper have no unfilled holes.
 
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