A definition in semiconductor physics, carrier lifetime is defined as the average time it takes for a minority carrier to recombine. The process through which this is done is typically known as minority carrier recombination.
The energy released due to recombination can be either thermal, thereby heating up the semiconductor (thermal recombination or non-radiative recombination, one of the sources of waste heat in semiconductors), or released as photons (optical recombination, used in LEDs and semiconductor lasers).
Carrier lifetime plays an important role in bipolar transistors and solar cells.
In indirect band gap semiconductors, the carrier lifetime strongly depends on the concentration of recombination centers. Gold atoms act as highly efficient recombination centers, silicon for some high switching speed diodes and transistors is therefore alloyed with a small amount of gold. Many other atoms, e.g. iron or nickel, have similar effect.
Read more about Carrier Lifetime: Carrier Lifetime in Semiconductor Lasers
Famous quotes containing the words carrier and/or lifetime:
“The problems of society will also be the problems of the predominant language of that society. It is the carrier of its perceptions, its attitudes, and its goals, for through it, the speakers absorb entrenched attitudes. The guilt of English then must be recognized and appreciated before its continued use can be advocated.”
—Njabulo Ndebele (b. 1948)
“Both cultures encourage innovation and experimentation, but are likely to reject the innovator if his innovation is not accepted by audiences. High culture experiments that are rejected by audiences in the creator’s lifetime may, however, become classics in another era, whereas popular culture experiments are forgotten if not immediately successful. Even so, in both cultures innovation is rare, although in high culture it is celebrated and in popular culture it is taken for granted.”
—Herbert J. Gans (b. 1927)