Analog Electronics
In a bipolar junction transistor the base region is made very thin so that

  base can be easily biased.
  base can be easily fabricated.
  electric field gradient in base is high.
  recombination in base region is minimum.

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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 the emitter doping.
  depends largely upon emitter-base junction base potential.

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