![]() The samples were treated in plasma with varying treatment time from 0 to 60 seconds. The air plasma treatment caused enhanced optical absorbance and optical absorption region as revealed by the formation of Ti 3+ and oxygen vacancies in the band gap of TiO 2 films. Ti 3+, Ti 4+, O 2−, oxygen vacancies, OH group and optical properties was studied using X-ray photon spectroscopy (XPS) and UV-Vis spectroscopy. The moderate doping could facilitate the formation of charge trap centers or avoid the formation of charge recombination centers. TiO 2 thin films having moderate doping of Fe and Co exhibit significant enhancement in the aforementioned optical properties upon air plasma treatment. This is the first time we report that simply air plasma treatment can also enhances the optical absorbance and absorption region of titanium oxide (TiO 2) films, while keeping them transparent. ![]()
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