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Why the cut in voltages of silicon and germanium different?
What is bandgap?
Bandgap is the energy gap between the valence band and conduction band in a material. In layman's terms, it is the minimum amount of energy required to move an electron from the valence band to the conduction band. Semiconductors with a larger bandgap require more energy to reach the conduction band, which means they have a higher cut-in voltage.