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  4. In a p -type semiconductor germanium is doped with:

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Q. In a p -type semiconductor germanium is doped with:

Bihar CECEBihar CECE 2002

Solution:

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.