Ion-plasma treatment of Cd1 − xZnxTe (x ∼ 0.04) single crystals and application of antireflection diamond-like carbon films

The influence of ion-plasma treatment of Cd1 − x Zn x Te (x ∼ 0.04) single crystals, which precedes the deposition of an antireflection coating (a diamond-like a-C: H: N film) on the optical properties of the resulting structure, is investigated. Treatment is carried out in an argon, nitrogen, and hydrogen plasma. As follows from the optical properties of the a-C: H: N/Cd1 − x Zn x Te, the structure treated in an argon plasma offers the highest transmission. A model of the optical system is proposed that takes into account the formation of transition layers after ion-plasma treatment and the effect of the type of ion on their characteristics. The absorption spectra of the a-C: H: N/Cd1 − x Zn x Te system are analyzed, and bands assigned to the stretching and bending vibrations of C-H bonds, as well as to C-C and C=O bonds, are revealed. The presence of these bonds should be taken into account in designing and synthesizing these optical coatings.