Abstract
It is established that the mechanisms of light absorption in titanium dioxide films differ in the visible and near-infrared spectral ranges. In the near-infrared range of the spectrum, the contribution to the absorption coefficient made by the intrinsic defects associated with the nonstoichiometry of the film composition is dominant. At the same time, in the visible spectral range, the main contribution to absorption is most likely made by external defects, namely, foreign inclusions and impurities contained in the starting material for film deposition. It is shown that the introduction of monitoring of the photothermal signal from the pellets of the raw material makes it possible to minimize and stabilize the absorption in the visible region of the spectrum.
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