KCET · Chemistry · Classification of Elements and Periodicity in Properties
Silicon doped with gallium forms
- A \(n\)-type semiconductor
- B both \(n\) and \(p\)-type semiconductor
- C an intrinsic semiconductor
- D \(p\)-type semiconductor
Answer & Solution
Correct Answer
(D) \(p\)-type semiconductor
Step-by-step Solution
Detailed explanation
Silicon belongs to group 14 and gallium comes in group 13. So, when Si is doped with Ga, \(p\)-type of semiconductor is produced as group 13 elements have only 3 valence electrons, there on combination with group 14 elements produce an electron deficient bond or have electron vacancy and as such can move through the crystal like a positive charge giving rise to electrical conductivity.
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