{ A semiconductor has equal electron and hole concentrations of }2×10^8m^{-3} On doping with a certain impurity, }}{ the hole concentration increases to }4×10^{10}m^{-3} . }} (1) What type of semiconductor is obtained on doping? } (ii) Calculate the new electron concentration of the semiconductor. } (iii) How does the energy gap vary with doping?

{ A semiconductor has equal electron and hole concentrations of }2×10

1.	{ A semiconductor has equal electron and hole concentrations of }2×10^8m^{-3} On doping with a certain impurity, }}{ the hole concentration increases to }4×10^{10}m^{-3} . }} (1) What type of semiconductor is obtained on doping? } (ii) Calculate the new electron concentration of the semiconductor. } (iii) How does the energy gap vary with doping?
Answer» { A semiconductor has equal electron and hole concentrations of }2×10^8m^{-3} On doping with a certain impurity, }}{ the hole concentration increases to }4×10^{10}m^{-3} . }} (1) What type of semiconductor is obtained on doping? } (ii) Calculate the new electron concentration of the semiconductor. } (iii) How does the energy gap vary with doping?

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