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"Excitonic" and Photoionization Absorption Spectra of Iron in III-V Materials

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Wysmołek A., Tryc R., Bożek R., Hennel A.
Acta Physica Polonica A
|
1992
|
vol. 82
|
issue 5
911-913
EN
We report optical absorption measurements of Fe-doped GaAs, InP and GaP crystals obtained with the help of different doping techniques. In all these crystals photoionization spectra corresponding to Fe^{3+} → Fe^{2+} transitions with sharp "excitonic" lines were observed. The intensities of these lines are not proportional to the intensities of photoionization absorption bands, i.e. to the concentration of the Fe^{3+} centers. Variation of more than one order of magnitude was observed for different semiconductors and for different crystals of the same material. These results suggest that only some iron centers are responsible for the "excitonic" spectra.
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