Analog Electronics
Acceptor type impurities

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

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.
  in the forward direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.

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