IGNOU MPH 5 2026 - Describe various electron-hole pair generation process

Question

Describe various electron-hole pair generation processes in semiconductor.

19 Jan 2026

Answer :

Word Count : 261

In semiconductors, electron-hole pairs are generated when electrons in the valence band gain enough energy to jump to the conduction band, leaving behind a hole in the valence band. There are several key processes responsible for electron-hole pair generation. The first is thermal generation, which occurs due to the thermal energy present in the semiconductor at non-zero temperatures. At higher temperatures, some valence electrons acquire sufficient energy to cross the bandgap into the conduction band, creating electron-hole pairs. This process is intrinsic to the material and increases exponentially with temperature. The second process is optical generation or photogeneration, where

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