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What are p type semiconductors |
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Answer» __________ A P type semiconductor is obtained by dopping an INTRINSIC semiconductor with a trivalent impurity . When a trivalent impurity is ADDED with a silicon atom , it FALLS short of one electron for completing the four covalent bonds with its neighbours . The substitution of a host silicon atom with say boron atom does not disturb the neutral environment around boron atom . However an electron from a neighbouring atom aquires energy and JUMPS to form a bond , it leaves behind a hole . The boron atom having ACQUIRED an additional electron becomes a negative ion . The hole can move freely in the valence band whereas the impurity ion is immobile . BORON ALUMINIUM ____________ |
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