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Conference Paper
Interfacial Engineering of YBa2Cu3O7/Bi2Se3 via Al2O3 Buffer Layers for Enhanced Structural and Superconducting Properties
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- Authors
- Woo-Jung Lee, Suji Lee, Dae-Hyung Cho, Tae-Ha Hwang, Yong-Duck Chung
- Issue Date
- 2026-05
- Citation
- European Materials Research Society (E-MRS) Meeting 2026 (Spring), pp.1-1
- Publisher
- European Materials Research Society (E-MRS)
- Language
- English
- Type
- Conference Paper
- Abstract
- Hybrid heterostructures combining high-temperature superconductors and topological insulators are promising candidates for superconducting and quantum device applications. However, their practical implementation is severely limited by interfacial reactions and elemental diffusion originating from cuprate superconductors. In this study, we investigate YBa2Cu3O7 (YBCO)/Bi2Se3 heterostructures incorporating an ultrathin Al2O3 buffer layer and systematically examine the influence of buffer layer thickness on interfacial stability and device characteristics. To elucidate the thickness-dependent role of the Al2O3 buffer layer, interfaces in YBCO/Al2O3/Bi2Se3 heterostructures were systematically characterized by Raman spectroscopy, high-resolution transmission electron microscopy, and depth-resolved X- ray photoelectron spectroscopy. We find that the insertion of Al2O3 effectively suppresses Cu and Ba diffusion from YBCO, while the degree of diffusion suppression and mixed interfacial layer formation strongly depends on the buffer layer thickness. An optimized Al2O3 thickness significantly improves the structural integrity of the layered Bi2Se3 film, whereas excessively thin or thick buffers result in incomplete diffusion blocking or degraded interface quality. Electrical transport measurements demonstrate that heterostructures with an optimized Al2O3 buffer layer thickness exhibit enhanced superconducting properties and more stable device behavior compared to unbuffered or non-optimized structures. These results highlight the critical role of buffer-layer thickness in interface engineering superconductor and topological insulator heterostructures, and provide practical design guidelines for YBCO-based superconducting and quantum devices.
- KSP Keywords
- Buffer layer thickness, Cuprate superconductors, Device characteristics, Diffusion blocking, Electrical transport measurements, Electron Microscopy(TEM and SEM), Hybrid heterostructures, Interfacial engineering, Interfacial stability, Layer formation, Practical design