Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
Optical Processes in Semiconductors
When light incident on a semiconductor, an electron in the valence band goes to the conduction band. This process generates electron-hole pairs. It is also possible for an electron and a hole to recombine and emit light
OPTICAL PROCESSES IN SEMICONDUCTORS
When
light incident on a semiconductor, an electron in the valence band goes to the
conduction band. This process generates electron-hole pairs. It is also
possible for an electron and a hole to recombine and emit light.
The
interaction between light (photons) and electrons in a variety of phenomena.
These are used in the field of opto electronics.
The
important optoelectronic interaction in semiconductors is the band-to-band
transition (Fig.4.1). In the photon absorption process, a photon scatters an
electron in the valence band.
Thus,
electron jumps to the conduction band and leaving a hole in VB. In the reverse
process the electron in the conduction band recombines with a hole in the
valence band to generate a photon.
Physics for Electronics Engineering: Unit IV: Optical Properties of Materials : Tag: : - Optical Processes in Semiconductors
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Physics for Electronics Engineering
PH3254 - Physics II - 2nd Semester - ECE Department - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation