A) aluminium
B) boron
C) gallium
D) all of these
Correct Answer: D
Solution :
Key Idea: Charge carriers in p-type semiconductors 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 deficiencies of valence electrons called holes, forming a p-type semiconductor.
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