Analog Electronics
The magnitude of electric current ICBO

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

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Analog Electronics
For transistor action

  the base region must be very thin and lightly doped.
  all of these.
  the emitter should be heavily doped.
  Je must be forward biased and Jc should be reverse biased.

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