A) aluminium
B) boron
C) gallium
D) all of these
Correct Answer: D
Solution :
Key Idea: Charge carriers in p-type semicon- ductors are holes. The addition of trivalent impurities such as boron (atomic number 5), aluminium (atomic number 13), gallium (atomic number 31), to an intrinsic semiconductor (germanium) creates deficiences of valence electrons called holes, forming a p-type semiconductor.
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