Analog Electronics
Acceptor type impurities

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

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Analog Electronics
The magnitude of electric current ICBO

  is generally greater in silicon than in germanium transistor.
  increases with the increase in temperature.
  depends largely upon emitter-base junction base potential.
  depends largely upon the emitter doping.

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