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

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

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Analog Electronics
The magnitude of electric current ICBO

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

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