SELECT * FROM question_mgmt as q WHERE id=1752 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=56 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry The Solid State classify each of the following as being either a p

Question:

Classify each of the following as being either a p-type or an n-type semiconductor:

(i) Ge doped with In

(ii) B doped with Si.

Answer:

(i) Ge belongs to group 14 and In belongs to group 13, In has 3 valence electrons while Ge has 4 valence electron. On replacement an electron deficient hole was created, therefore it is a p-type semi- conductor.

(ii) B belongs to group 13 with 3 valence electrons and Si belongs to group 14 with 4 valence electrons. Therefore on replacement there will be a free electron and it is n-type semiconductor.


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