Radiative lifetimes and time-resolved spectra have been obtained for high-purity n-type gallium arsenide at low temperatures. The ∼ 1.51-eV bands, generally associated with the annihilation of free and bound excitons, decay very rapidly, τ < 15 nsec. The 1.49-eV band, variously described as donor-acceptor recombination or as a free-to-bound recombination, has a longer nonexponential decay. For this band, the time-resolved spectra show a steady shift to lower energy as the delay after the pulse is lengthened. The conclusion drawn is, that the 1.49-eV band arises from a D-A recombination process.
No takes yet. Share an insight, caveat, or question.
Dingle et al. (1969) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: