Interface Carriers and Enhanced Electron-Phonon Coupling Effect in Al2O3/TiO2 Heterostructure Revealed by Resonant Inelastic Soft X-Ray Scattering
- Authors
- Shao, Yu-Cheng; Kuo, Cheng-Tai; Feng, Xuefei; Chuang, Yi-De; Seok, Tae Jun; Choi, Ji Hyeon; Park, Tae Joo; Cho, Deok-Yong
- Issue Date
- Aug-2021
- Publisher
- John Wiley & Sons Ltd.
- Keywords
- 2D electron gas; aluminum oxide; dd excitation; electron-phonon coupling; oxide heterostructures; resonant inelastic X-ray scattering; titanium oxide
- Citation
- Advanced Functional Materials, v.31, no.35, pp 1 - 9
- Pages
- 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Advanced Functional Materials
- Volume
- 31
- Number
- 35
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/105750
- DOI
- 10.1002/adfm.202104430
- ISSN
- 1616-301X
1616-3028
- Abstract
- The electronic structure and the electron-phonon couplings in a novel mass-production-compatible Al2O3/TiO2 2D electron system (2DES) are investigated using resonant inelastic soft X-ray scattering. The experimental data from the samples of various TiO2 thicknesses unequivocally show that the Ti3+ state indeed exists at the deep interface to serve as an n-type dopant for the 2DES. The electronic structure of Ti3+ species is scrutinized as entirely separated from that of the Ti4+ host lattice. Furthermore, features of sub-eV energy loss phonon modes are clearly observed, indicating substantial electron-phonon coupling effects. Such low energy loss features are enhanced in thinner TiO2 samples, implying that polaronic local lattice deformation is enhanced due to the presence of Ti3+. These findings suggest that the 2DES properties can be controlled via well-established TiO2 engineering, thereby enthroning the binary oxide heterostructure as a promising candidate for 2DES device applications.
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