why SCR, why not GCR

Discussion in 'General Electronics Chat' started by dienshvr, Jul 16, 2006.

  1. dienshvr

    Thread Starter New Member

    Jul 16, 2006
    1
    0
    sir

    i want to know why Silicon is used in manu. of controlled rectifier and why not germanium
     
  2. rukrazy?

    Member

    Mar 5, 2005
    21
    0
    Silicon is widely used in semiconductors because it has a lower reverse leakage current than the semiconductor Germanium, and because its native oxide is easily grown in a furnace and forms a better semiconductor/dielectric interface than almost all other material combinations.
     
  3. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    It is also much more stable at higher operating temperatures, and it is much easier to control any "Thermal Runaway"....
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    Thermal runaway is the primary reason that the semiconductor industry uses silicon over germanium. If I recall my semiconductor physics education correctly, the reason that germanium suffers from thermal runaway more so than silicon is due to the fact that germanium has a much smaller band-gap, whilst this makes germanium highly suitable for sensitive infra-red applications it means that thermal effects are exacerbated - thus the self-destructive thermal runaway effect.

    Dave
     
Loading...