Compensation Effects in N.T.D. Indium Doped Silicon
The infrared absorption spectrum of indium-doped silicon has been investigated in N.T.D. compensated material and compared with the spectrum in the uncompensated material. Besides the decrease in the equilibrium concentration of optically active indium, the presence of ionized donors and acceptors produces a broadening and a shift of the absorption lines, and makes it possible to detect a forbidden transition. Gradual neutralization of the ionized impurities by controlled optical pumping shows the influence of compensation on the detectability of the highly excited levels. The decay with time of the out-of-equilibrium indium absorption is recorded and attributed to pair recombination. Finally, a brief comparison of the optical calibration factors for indium concentration in silicon is given.
KeywordsPhosphorus Recombination Germanium Halogen
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