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Why are element dopant for silicon …

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Why are element dopant for silicon or germanium usually chosen from group xlll or group xv?

Posted by Abhishek Sah 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Mahi D 5 years, 10 months ago

Dopant for silicon are taken from grp 13 and 15 because their atomin sizes are not very different from that of grp14 .. so this will not distort the structure of the semiconductor . If elements of other groups are used ,it would not be feasible to make it and it will not behave like a semiconductor.

Tamanna Sharma 5 years, 10 months ago

In order to make ptype and ntype semiconductor means to create donor site and acceptor site in the valance shell, reason -the basic reason to use these groups is the dopant energy level within the bandgap ,for a particular temperature these dopant 100% activate according to the relation : K/t =1/V×eta here K is boltzman constant , t is temperature in Kelvin, V is thermal voltage, eta is ideality factor. But why at high diode current eta is 1 for both Ge and Si ,that's also my query if you know about this ,then please tell me.

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