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讨论了Ce替代石榴石薄膜制备条件对其光吸收性能的影响。通过引入氧空位概念,提出了溅射气氛中的氧含量对薄膜中Ce元素价态影响的理论模型。基于该模型,讨论了Ce:YIG晶体中氧空位的产生机理。研究表明,当晶格中存在过量氧空位时,会导致部分Fe3+被还原成Fe2+,使得薄膜的光吸收显著增大。实验结果证实,在Ce:YIG薄膜的晶化过程中,采用富氧气氛可以使得薄膜中Ce元素的价态以Ce3+离子为主而Ce4+离子含量较少,从而有效降低薄膜的光吸收。溅射气氛中的氧含量及后续热处理过程中氧含量的大小均会直接影响Ce:YIG薄膜的光吸收特性。
The effects of the preparation conditions on the optical absorption properties of Ce substituted garnet films were discussed. By introducing the concept of oxygen vacancies, a theoretical model of the effect of oxygen content in the sputtering atmosphere on the valence state of Ce in the film was proposed. Based on this model, the formation mechanism of oxygen vacancies in Ce: YIG crystals is discussed. Studies have shown that when there is an excessive amount of oxygen vacancies in the crystal lattice, some of the Fe3 + ions are reduced to Fe2 +, resulting in a significant increase in the light absorption of the film. The experimental results show that during the crystallization process of Ce: YIG thin films, the oxygen vacancy of Ce can make the valences of Ce elemental Ce and Ce4 + ions lower, which can effectively reduce the light absorption of the films. The oxygen content in the sputtering atmosphere and the oxygen content in the subsequent heat treatment will directly affect the light absorption characteristics of the Ce: YIG thin film.