"Excitonic" and Photoionization Absorption Spectra of Iron in III-V Materials
A. Wysmołek, R. Tryc, R. Bożek and A.M. Hennel
Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland
Full Text PDF
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 Fe3+ → Fe2+ 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 Fe3+ 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.
DOI: 10.12693/APhysPolA.82.911
PACS numbers: 71.55.Eq, 78.55.Cr