Barrier potential

  1. The equation for the barrier potential is as follows:

    Vb = Vt loge(Na*Nd/square(n)) mV
    where Vt=KT/e

    This equation shows that the barrier potential is directly proportional to the temperature. So as temperature increases the barrier potential should increase.

    But in contradiction to this, I have found the following statement:

    " With increase in temperature, more minority charge carriers are produced, leading to their increased drift across the junction. As a result, equilibrium occurs at a lower barrier potential. It is found that the Vb decreases by about 2 mV/0C

    Please explain...
  2. jcsd
  3. Simon Bridge

    Simon Bridge 15,471
    Science Advisor
    Homework Helper
    Gold Member

    There is more than one effect happening here.
    Presumably the equation for the barrier potential did not take into account the minority carrier concentrations.
    Where are you reading this?
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