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Question
The addition of a small mass of impurity to a semi-conductor before it crystallizes is called___________.
The addition of a small mass of impurity to a semi-conductor before it crystallizes is called___________.
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Solution
The correct option is D doping
The addition of small amount of foreign impurity in the host crystal is called as doping. It results in an increase in the electrical conductivity of the crystal. Doping of group 14 elements (such as Si, Ge etc.) with elements of group 15 (such as As) produces an excess of electrons in the crystals. Thus, it gives n-type semiconductors. Doping of group 14 elements with group 13 elements (such as Indium) produces holes (electron deficiency) in the crystals. Thus, p-type semiconductors are produced. Then symbol 'p' indicates flow of positive charge.
The addition of small amount of foreign impurity in the host crystal is called as doping. It results in an increase in the electrical conductivity of the crystal. Doping of group 14 elements (such as Si, Ge etc.) with elements of group 15 (such as As) produces an excess of electrons in the crystals. Thus, it gives n-type semiconductors. Doping of group 14 elements with group 13 elements (such as Indium) produces holes (electron deficiency) in the crystals. Thus, p-type semiconductors are produced. Then symbol 'p' indicates flow of positive charge.
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