Abstract

Gigantic deformations were found for the copper sulfide (Cu1.4S and Cu2S) thin films irradiated with 100 MeV Au8+ swift heavy ions (SHI) for 1011 and 1012 ions cm−2 fluencies. It was observed that the deformation due to SHI is dependent on the chemical composition of the film. The optical band gap (E g) of the Cu1.4S was blue shifted, whereas that of Cu2S was red shifted. The surface modifications were also different for these two compositions. These effects were studied by using the atomic force microscopy and scanning electron microscopy. The results are explained in the light of thermal spike model.

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