1.

What are p type semiconductors

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\huge\green{P type Semiconductor }

A P type semiconductor is obtained by dopping an INTRINSIC semiconductor with a trivalent impurity .

\huge\pink{Explaination }

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 .

\huge\red{EXAMPLES OF TRIVALENT IMPURITY }

BORON

ALUMINIUM

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