In situ study of the electronic structure of polar-to-polar SrTiO3/($000\bar1$)ZnO heterointerface

Zhou, Hua; Wang, Hui-Qiong; Zheng, Jin-Cheng; Wang, Xiao-Dan; Zhang, Yufeng; Kang, Junyong; Zhang, Lihua; Kisslinger, Kim; Wu, Rui; Wang, Jia-Ou; Qian, Hai-Jie; Ibrahim, Kurash

doi:10.1016/j.rinp.2021.104827

Title: In situ study of the electronic structure of polar-to-polar SrTiO₃/($$000\bar1$$)ZnO heterointerface

Journal Article · Mon Sep 20 00:00:00 EDT 2021 · Results in Physics

DOI:https://doi.org/10.1016/j.rinp.2021.104827· OSTI ID:1855102

Zhou, Hua ^[1]; Wang, Hui-Qiong ^[2]; Zheng, Jin-Cheng ^[3]; Wang, Xiao-Dan ^[3]; Zhang, Yufeng ^[3]; Kang, Junyong ^[3]; Zhang, Lihua ^[4]; Kisslinger, Kim ^[4]; Wu, Rui ^[5]; Wang, Jia-Ou ^[5]; Qian, Hai-Jie ^[5]; Ibrahim, Kurash ^[5]

Shandong Univ., Jinan (China)
Xiamen Univ. (China); Xiamen Univ., Sepeng (Malaysia)
Xiamen Univ. (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Chinese Academy of Sciences (CAS), Beijing (China)

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-($$000\bar1$$) substrate via pulsed laser deposition. High-resolution transmission electron microscopic results revealed two types of polar interfaces: [$$11\bar2$$][$$10\bar1$$](111)_STO//[$$1\bar210$$][$$10\bar10$$]($$000\bar1$$)_ZnO and [111][$$2\bar1\bar1$$](011)_STO//[$$10\bar21$$][$$10\bar10$$]($$000\bar1$$)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/($$000\bar1$$)ZnO heterointerface.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Xiamen University Malaysia Research Fund

Grant/Contract Number:: SC0012704; 11204253; 11804050; XMUMRF/2019-C4/IORI/0002

OSTI ID:: 1855102

Report Number(s):: BNL-222849-2022-JAAM

Journal Information:: Results in Physics, Vol. 30; ISSN 2211-3797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: In situ study of the electronic structure of polar-to-polar SrTiO₃/($$000\bar1$$)ZnO heterointerface