Concept drill
bandgap
GATE Electronics & Communication · Semiconductor Devices - LED · 2014-2026
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All concepts →2026 Q54
Consider an LED based on a direct bandgap semiconductor material with energy bandgap 1.3 eV. Given: Plank's constant, h = 6.63 × 10^-34 J s and speed of light in free space is 3 ×...
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2019 Q48
A Germanium sample of dimensions 1 cm × 1 cm is illuminated with a 20 mW, 600 nm laser light source as shown in the figure. The illuminated sample surface has a 100 nm of loss-less...
hard
2014 PYQ
The cut-off wavelength (in µm) of light that can be used for intrinsic excitation of a semiconductor material of bandgap E g = 1.1 eV is ________.
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