| dc.description.abstract | Recently, iron pyrite (FeS2) has been considered as a potential
material for thin film solar cells and wet cells. Ir- che present
work pyrite FeS2 films have been grown by spray pyrolysis followed
by sulfidation.
The deposition parameters were identified and their optimum values
determined. The following values were found: temperature = 500°C,
spray rate = 24 cm3/min, and substrate to sprayer nozzle distance
35 to 40 cm. The contents FeC13: CS (NH2) 2 : H20 of the spraying
mixture were found to be in the volume ratios 0.07:0.15:0.78 for
molarities in the range 0.1 and 1 while for molarities less than
0.1 the volume ratios were 1:2.
Transmission data analysis in the wavelength range 0.4 ~m and 0.8~m
gave an indirect energy gap = 1.17 eV, a possible direct band gap
= 2.60 eV and an absorption coefficient = 104cm·1.Sulfidated samples
showed absorption coefficient of =105cm-1
• The structural analysis
revealed an improvement in the crystallization with the increasing
sulfidation temperature. The films showed a preferred orientation
in the (200) direction. Electrical transport properties study
indicated that the films exhibit n-type conduction. The carrier
concentration was found to be n = (0.15 - 0.23) X1017 cm-3, the Hall
mobility ~H = 0.6 to 1.5 cm2V<s-1 and the Hall constant RH = (-4.2
to -2.3)x102 cm3c-1. | en |
