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

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

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the emitter junction with collector open.
  in the forward direction to the emitter junction with collector open.
  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the collector junction with emitter open.

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