Which one of the following semi-conductors possesses the highest value of band gap Eg?
Si
Ge
GaAs
PbS
Answer is Wrong!
Answer is Right!
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UPSC Geoscientist – 2023
Si (Silicon): ~1.1 eV (indirect band gap)
Ge (Germanium): ~0.67 eV (indirect band gap)
GaAs (Gallium Arsenide): ~1.42 eV (direct band gap)
PbS (Lead Sulfide): ~0.37 eV (direct band gap)
Comparing these values, GaAs has the highest band gap among the options.