Heterojunction connecting by interface chemical bonds is a promising method as it can provide more efficient route for photogenerated charge separation. In this work, the oxygen vacancies are introduced into the surface of SrTiO₃ by a one‐step hydrogenation method. SrTiO₃ with oxygen vacancy (STO) is compounded with Cd_0.5Zn_0.5S (CZS) by hydrothermal method, resulting in the successful formation of a good heterojunction structure. By comparing with the pristine SrTiO₃/CZS composites, it is found that the oxygen vacancies play an important role in the formation of excellent heterojunctions, in addition to the traditional reports as charge traps and adsorption sites or the ability to cause band changes. X‐ray photoelectron spectroscopy (XPS) and high‐resolution transmission electron microscope results disclose that S²⁻ enters the oxygen vacancy on the (110) plane of STO and interacts with the adjacent Ti in the van der Waals force to form the Ti‐O‐S group, which results in the formation of excellent heterojunctions and makes the CZS nanoparticles growth evenly on the STO nanoplates. Furthermore, the formation of excellent heterojunction and the introduction of interfaced oxygen vacancy significantly improve the separation efficiency of photogenerated charge carriers, which dramatically increases the photoelectrochemical performance.

中文翻译：

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界面氧空位辅助制备优异的异质结以提高光生载流子的分离能力

通过界面化学键进行异质结连接是一种很有前途的方法，因为它可以为光生电荷分离提供更有效的途径。在这项工作中，通过一步氢化方法将氧空位引入SrTiO ₃的表面。通过水热法将具有氧空位（STO）的SrTiO ₃与Cd _0.5 Zn _0.5 S（CZS）混合，成功形成了良好的异质结结构。通过与原始SrTiO _3的比较在/ CZS复合材料中，发现氧空位在形成优异的异质结中起着重要作用，此外传统报告还包括电荷陷阱和吸附位点或引起谱带变化的能力。X射线光电子能谱（XPS）和高分辨率透射电子显微镜结果表明，S ²⁻进入STO（110）平面上的氧空位，并在范德华力中与相邻的Ti相互作用形成Ti-O-S基团，这导致形成优良的异质结并使CZS纳米粒子在硅上均匀生长STO纳米板。此外，优异的异质结的形成和界面氧空位的引入显着提高了光生电荷载流子的分离效率，从而显着提高了光电化学性能。