A Ge specimen is doped with Al. the concentration of acceptor atom is ~ 10^21 atom/m^3. Given that the intrinsic concentration of electron hole pairs is ~ 10^19/m^3, the concentration of electrons in the specimen is

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Q: A Ge specimen is doped with Al. the concentration of acceptor atom is ~ 10^21 atom/m^3. Given that the intrinsic concentration of electron hole pairs is ~ 10^19/m^3, the concentration of electrons in the specimen is

(a) 1017/m3

(b) 102/m3

(c) 104/m3

(d) 102/m3

Sol: (a) ni2 = ne nh

(1019 )2 = ne × 1021

ne = 1017/m^3

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