Analog Electronics
The silicon transistor are more widely used than germanium transistors because

  they have larger electric current carrying capacity.
  they have better ability to dissipate heat.
  they have smaller depletion layer.
  they have smaller leakage current.

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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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