Materials Science: 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.
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 the semiconductor provides 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. These two processes are importance for light-detection and light-emission devices. The rate of the light-emission and absorption processes are determined by quantum mechanics.
Materials Science: Unit IV: Optical Properties of Materials : Tag: : - Optical Processes in Semiconductors
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