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

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

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Analog Electronics
In a transistor amplifier, the reverse saturation electric current ICO

  double for every 1° rise in temperature.
  increase linearly with the temperature.
  double for every 10° rise in temperature.
  double for every 5° rise in temperature.

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