The effect of irradiation on optical and electrical features of (HgI2) film was done using solution method on glass substrate, with thickness of (10) μm. The film was irradiated by Cs137 to obtain Gamma ray at time irradiation of 48 h. The spectra absorbance and transmittance have been registered in the range (200–1000) nm. The results show that the optical band gap for (HgI2) decreased after irradiation with gamma ray, the prepared films were found to have a straight energy gap in the range of 2.2 eV before irradiation and 1.7 eV after irradiating. The calculated optical coefficients, such as absorption, extinction, refracting index were changed after irradiating with gamma ray. For the I-V characteristic, an increasing in the current after irradiation has been obtained.
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