Unformatted text preview: x is a small fractional number a) Co 1-x O In a stoichiometric compound, CoO, cobalt would take 2+ valence. Since Co deficient, some cobalt would increase their valence to 3+. Tri-valent Co 3+ could change Co 3+ Co 2+ + h • p-type semiconductor b) WO 3-x In a stoichiometric compound, WO 3 , tungsten would take 6+ valence. Since oxygen is deficient, some tungsten would reduce their valence to 5+. W 5+ could change W 5+ W 6+ + e’ n-type semiconductor...
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- Spring '08
- Oxide, Cobalt, P-type semiconductor, Non-stoichiometric compound