The SrTiO₃(STO)/ZnO heterointerface, which is widely used in the fabrication of novel optoelectronic devices, is a classical system combining functional perovskite oxides and wurtzite-structure semiconductor materials. The electronic structure of the heterointerface often plays a significant role in controlling the functions of novel devices. In this study, the electronic structure was explored using in situ photoemission spectroscopy and X-ray absorption spectroscopy. X-ray diffraction results showed the coexistence of (1 1 1)_STO and (0 1 1)_STO orientations for the STO film deposited on the ZnO-(000$\stackrel{-}{1})$ substrate via pulsed laser deposition. High-resolution transmission electron microscopic results revealed two types of polar interfaces: [11$\stackrel{-}{2}$][10$\stackrel{-}{1}$](1 1 1)_STO//[1$\stackrel{-}{2}$10][10$\stackrel{-}{1}$0](000$\stackrel{-}{1}$)_ZnO and [1 1 1][2$\stackrel{-}{1}\stackrel{-}{1}$](0 1 1)_STO//[10$\stackrel{-}{2}1$][10$\stackrel{-}{1}$0](000$\stackrel{-}{1}$)ZnO. In situ photoemission spectroscopic results revealed downward band bending and the transformation of the valence states of Ti from 4+ to 3+, with extra electrons transferring to the hybridization states between O 2p and Ti t_2g orbitals at the polar-to-polar STO/ZnO interface. We propose that the polar discontinuity drives the electron transfer to the STO/ZnO interface during the growth process. This study provides insight into the electronic structure of the STO/(000$\stackrel{-}{1}$)ZnO heterointerface.

SrTiO ₃ (STO)/ZnO异质界面广泛用于制造新型光电器件，是结合功能性钙钛矿氧化物和纤锌矿结构半导体材料的经典系统。异质界面的电子结构通常在控制新型器件的功能方面起着重要作用。在这项研究中，使用原位光电发射光谱和 X 射线吸收光谱探索了电子结构。X射线衍射结果表明（1并存 1  1）_STO和（0  1  1）_STO（取向为沉积在ZnO-的STO膜000$\stackrel{——}{1})$衬底通过脉冲激光沉积。高分辨率透射电子显微镜结果揭示了两种类型的极性界面：[11$\stackrel{——}{2}$][10$\stackrel{——}{1}$](1  1  1) _STO //[1$\stackrel{——}{2}$10][10$\stackrel{——}{1}$0](000$\stackrel{——}{1}$)_氧化锌和 [1  1  1][2$\stackrel{——}{1}\stackrel{——}{1}$](0  1  1) _STO //[10$\stackrel{——}{2}1$][10$\stackrel{——}{1}$0](000$\stackrel{——}{1}$)氧化锌。原位光电发射光谱结果揭示了向下的带弯曲和 Ti 的价态从 4+ 到 3+ 的转变，额外的电子转移到 O 2p 和 Ti t _2g轨道之间的杂化态在极地到极地 STO/氧化锌界面。我们建议在生长过程中极性不连续性驱动电子转移到 STO/ZnO 界面。这项研究提供了对 STO/(000$\stackrel{——}{1}$)ZnO 异质界面。