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Engineering Physics by S. Mani Naidu

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8.6 Minority carrier life time

In this topic, we will study the life time of minority carriers in an extrinsic semiconductor. In n-type semiconductor, hole carrier life time and in p-type semiconductor electron carrier life time are called the minority carrier life times. This can be explained in the following way.

In a semiconductor, the conduction electrons and holes are moving in random directions. So, for every second, some free electrons may come across holes or some holes may come across free electrons and recombination takes place. For every recombination, a pair of electron-hole will be lost in the material. The number of recombinations take place in 1 second per unit volume of the material is called recombination rate and is represented ...

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