The creation of an electron-hole plasma in a semiconductor leads to a large band-gap shrinkage which can be used to obtain absorptive optical bistability caused by discontinuous jumps between states of weak band-tail absorption and states of strong band-edge absorption. These effects are described by rate equations for the photons and free carriers. For CdS the calculated hysteresis phenomena are similar to the experimental results.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)