Questions
Statement I: If the temperature of a semiconductor is increased, then its resistance decreases.
Statement II: The energy gap between conduction band and valence band in a semiconductor is very small.
detailed solution
Correct option is A
In semiconductors the energy gap between conduction band and valence band is small (≈ 1 eV). Due to temperature rise, electron in the valence band gained thermal energy and may jump across the small energy gap, goes in to the conduction band. Thus conductivity increases and hence resistance decreases.Talk to our academic expert!
Similar Questions
An n-type semiconductor has impurity level 20meV below the conduction band. In a thermal collision, transferable energy is KT. The value of T for which electrons start to jump in conduction band is :
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