8.
Silicon is preferred over Germanium because :
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The reasons behind this are:-
- At room temperature, Silicon crystal has fewer free electrons than Germanium crystal. This implies that silicon will have much smaller Collector cut off current than Germanium.
- The variation of Collector cut off current with temperature is less in Silicon compared to Germanium.
- The structure of Germanium crystals will be destroyed at higher temperature. However, Silicon crystals are not easily damaged by excess heat.
- Peak Inverse Voltage ratings of Silicon diodes are greater than Germanium diodes.
- Si is less expensive due to the greater abundance of element. The major raw material for Si wafer fabrication is sand and there is lots of sand available in nature.
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