______ Gallium (Ga) is below Aluminum (Al) in the periodic table of the elements
ID: 2084606 • Letter: #
Question
______ Gallium (Ga) is below Aluminum (Al) in the periodic table of the elements, therefore, it is expected that GaAs has a wider bandgap compared to AlAs. _____ Wider bandgap semiconductors generally have higher number of intrinsic carriers. _______ Instrinsic semiconductors cannot conduct electricity at all. ______ If temperature increase so that the intrinsic carrier concentration reaches and surpasses doping concentration, extrinsic semiconductor turns into intrinsic semiconductor. i. _______ LEDs cannot be made of silicon because silicon has a smaller band gap compared to GaAs. J. _____ GaAs has a larger band-gap compared to silicon therefore it can absorb a wider range of different wavelengthsExplanation / Answer
e- False
f- False
A wider bandgap will not allow much carriers to pass. Hence intrinsic carriers will be low.
g-False
They can conduct low electricity due to less number of free carriers. Due to doping number of free carriers increases and conductivity also increase.
h- False
When temperature decreases they again tend to gain their original state.
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