Analog Electronics

Mass action law

This law states the relation between concentrations of minority and majority carriers at a constant temperature. It states that product of concentration of majority and minority carrier is constant at fixed temperature. According to the law

                                n * p = ni2 at constant temperature

  • niis the intrinsic concentration given by   and is constant at a temperature
  • n is the concentration of electrons and p is the concentration of holes. So in p-type material, p is concentration of majority carriers and n is concentration of minority carriers. Similarly in n-type, n is concentration of majority carriers and p is concentration of minority carriers.

According to the law, if we increase the doping level of the material i.e. concentration of majority carriers, then concentration of minority carriers would decrease.

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