A 2.11-cm2 wafer of pure silicon is irradiated with electromagnetic radiation having a wavelength of 775 nm. The intensity of the radiation is 4.16 W/m2 and every photon that strikes the sample is absorbed and creates an electron-hole pair.
(a) How many electron-hole pairs are produced in one second?
s?1
(b) If the number of electron-hole pairs in the sample is 6.25 multiply.gif 1011 in the steady state, at what rate do the electron-hole pairs recombine?
s?1
(c) If every recombination event results in the radiation of one photon, at what rate is energy radiated by the sample?
mJ/s