| Autor: |
Hua Zhou, Hui-Qiong Wang, Jin-Cheng Zheng, Xiao-Dan Wang, Yufeng Zhang, Junyong Kang, Lihua Zhang, Kim Kisslinger, Rui Wu, Jia-Ou Wang, Hai-Jie Qian, Kurash Ibrahim |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Results in Physics, Vol 30, Iss , Pp 104827- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2211-3797 |
| DOI: |
10.1016/j.rinp.2021.104827 |
| Popis: |
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 (111)STO and (011)STO orientations for the STO film deposited on the ZnO-(0001-) substrate via pulsed laser deposition. High-resolution transmission electron microscopic results revealed two types of polar interfaces: [112-][101-](111)STO//[12-10][101-0](0001-)ZnO and [111][21-1-](011)STO//[102-1][101-0](0001-)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 t2g 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/(0001-)ZnO heterointerface. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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