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प्रश्न
Two crystals C1 and C2, made of pure silicon, are doped with arsenic and aluminium respectively.
Identify the extrinsic semiconductors so formed.
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उत्तर
Arsenic is pentavalent. So, C1 doped with arsenic will form an n-type semiconductor.
Aluminium is trivalent. So, C2 doped with aluminium will form a p-type semiconductor.
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संबंधित प्रश्न
The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 × 1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni= 1.5 × 1016 m−3. Is the material n-type or p-type?
Distinguish between intrinsic and extrinsic semiconductor. (Give any two points).
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Name the extrinsic semiconductors formed when pure germanium is doped with a trivalent impurity. Draw the energy band diagram of extrinsic semiconductors so formed.
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