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Unformatted text preview: For III-V semiconductors, we choose to a group II element to substitute for the Group III element to obtain a p-type semiconductor, and a group VI element to substitute for a group V element to obtain an n-type semiconductor. Interestingly, a group IV element, can act as an acceptor when it substitutes for the group IV element, or as a donor when it substitutes for the group III element. One more example of an n-type semiconductor exists. All the equations derived earlier in the extrinsic semiconductor section are valid for extrinsic, compound semiconductors. Cd As Ga As As As Ga Ga Ga As Ga As Covalent/ionic bonds p-type semiconductor p-type semiconductor Missing valence electron Ga Si Ga As As As Ga Ga Ga As Ga As Missing valence electron Ga Te Ga As As As Ga Ga Ga As Ga As n-type semiconductor Extra valence electron Ga As Ga As As As Ga Ga Ga As Ga As Covalent/ionic bonds III-V semiconductor Cd Te Cd Te Te Te Cd Cd Cd Te Cd Te Covalent/ionic bonds II-VI semiconductor...
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- Fall '10