Abstract
The effects of irradiation of 200 MeV silver ions on gallium phosphide with various fluences varying from 1×1011 to 2×1013 ions cm−2 were investigated with spectroscopic ellipsometry and atomic force microscopy (AFM) measurements. The refractive index and extinction coefficient measured in ultraviolet, visible and infrared regimes were found to vary with ion fluence. The optical energy band gaps of the irradiated samples estimated from the absorption coefficient were found to vary from 2.27 to 2.19 eV with increase in ion fluence. The surface morphology of non-irradiated and samples irradiated with various fluences was examined using AFM. As ion fluence increases, the nano-size hills were developed on the surface of gallium phosphide. The shape, size, density of hills and r.m.s. roughness of the samples irradiated with various ion fluences were found to depend on the ion fluence.
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