Jaypee University of Information Technology, Waknaghat, Solan-173234, H.P., India.
School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro Buk-gu, Gwangju, 61005, South Korea.
Sci Rep. 2016 Aug 30;6:32355. doi: 10.1038/srep32355.
This is the first time we report that simply air plasma treatment can also enhances the optical absorbance and absorption region of titanium oxide (TiO2) films, while keeping them transparent. TiO2 thin films having moderate doping of Fe and Co exhibit significant enhancement in the aforementioned optical properties upon air plasma treatment. The moderate doping could facilitate the formation of charge trap centers or avoid the formation of charge recombination centers. Variation in surface species viz. 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 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 TiO2 films. The samples were treated in plasma with varying treatment time from 0 to 60 seconds. With the increasing treatment time, Ti(3+) and oxygen vacancies increased in the Fe and Co doped TiO2 films leading to increased absorbance; however, the increase in optical absorption region/red shift (from 3.22 to 3.00 eV) was observed in Fe doped TiO2 films, on the contrary Co doped TiO2 films exhibited blue shift (from 3.36 to 3.62 eV) due to Burstein Moss shift.
这是我们首次报告，单纯的空气等离子体处理也可以提高 TiO2 薄膜的光吸收率和吸收区域，同时保持其透明性。Fe 和 Co 适度掺杂的 TiO2 薄膜在空气等离子体处理后，上述光学性能显著增强。适度掺杂有助于形成电荷俘获中心或避免形成电荷复合中心。使用 X 射线光电子能谱 (XPS) 和紫外-可见光谱研究了表面物种的变化，如 Ti(3+)、Ti(4+)、O(2-)、氧空位、OH 基团和光学性质。空气等离子体处理导致 TiO2 薄膜带隙中 Ti(3+)和氧空位的形成，从而提高了光吸收率和光吸收区域。样品在等离子体中的处理时间从 0 秒到 60 秒不等。随着处理时间的增加，Fe 和 Co 掺杂 TiO2 薄膜中的 Ti(3+)和氧空位增加，导致吸收率增加；然而，在 Fe 掺杂 TiO2 薄膜中观察到光吸收区域/红移（从 3.22 到 3.00 eV），而 Co 掺杂 TiO2 薄膜由于 Burstein Moss 位移则表现出蓝移（从 3.36 到 3.62 eV）。
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