Analog Electronics
Acceptor type impurities

All of these
 have three valance electrons
 are used to make P-type semiconductor
 Create excess holes

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Analog Electronics
A working diode must have

 Low resistance when forward or reverse biased
 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias

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