12.07.2015 Views

Chapter 29 Molecules and Solids

Chapter 29 Molecules and Solids

Chapter 29 Molecules and Solids

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Semiconductors <strong>and</strong> DopingGallium­doped silicon is a p­type semiconductor –the current is carried by “holes,” or spots in thevalence b<strong>and</strong> that are missing an electron – act likea positive charge moving in a filled valence b<strong>and</strong>.Ga has only 3 valence electrons

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