Abstract
Pure and Fe-doped Bi12SiO20 monocrystals have been studied. Five different Feoncentrations (0.36, 1.8, 3.6, 7.2 and 10.8 mol%) were incorporated. An increase of the dark conductivity by 4 orders of magnitude and a parallel decrease of the photoconductivity with increasing Fe-concentration were measured. A new trap with a concentration level of about 3 × 1018 cm−3, situated at about 0.42 eV below the conduction band bottom was observed. Contrasting changes in the absorption coefficient were found as a function of Fe-concentration. Three mechanisms are suggested to explain the observed changes in the electrical, photoelectrical and optical properties of the Bi12SiO20 crystals with Fe content.
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