Structural, electrical, and luminescence characteristics of vacuum-annealed epitaxial (Ba,La)SnO3 thin films

Anoop, Gopinathan; Park, Eun Young; Lee, Sungsu; Jo, Ji Young

doi:10.1007/s13391-015-4436-z

Cited by 13 publications

(9 citation statements)

References 21 publications

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“…After 36 h at 900 • C, a secondary grain growth along the most packed [111] direction was observed [36]. A similar recrystallization process was demonstrated by other authors [37]. This was also supported by the highresolution images in Figure 4c,d.…”

Section: Time-dependent Lbso Film Annealing In Vacuumsupporting

confidence: 88%

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

et al. 2022

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Perovskite-type La:BaSnO3 (LBSO) has been drawing considerable attention due to its high electron mobility and optical transparency. Its thin film electrical properties, however, remain inferior to those of single crystals. This work investigates the thermal post-treatment process of films deposited using the metalorganic chemical vapor deposition method to improve the electrical properties of different stoichiometry films, and demonstrates the modification of thin film’s structural properties using short and excessive annealing durations in vacuum conditions. Using vacuum post-treatment, we demonstrate the improvement of electrical properties in Ba-rich, near-stoichiometric, and Sn-rich samples with a maximum electron mobility of 116 cm2V−1s−1 at r.t. However, the improvement of electrical properties causes surface morphology and internal structural changes, which depend on thin film composition. At temperatures of 900 °C–1400 °C the volatile nature of LBSO constituting elements is described, which reveals possible deterioration mechanisms of thin LBSO air. At higher than 1200 °C, LBSO film’s decomposition rate increases exponentially. Thin film structure evolution and previously unreported decomposition is demonstrated by Ba and La diffusion to the substrate, and by evaporation of SnO-SnOx species.

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Section: Time-dependent Lbso Film Annealing In Vacuumsupporting

confidence: 88%

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

et al. 2022

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“…Nevertheless, the energy level of the Sn 2+ ions in BSO system is determined to be situated at ∼1.4 eV above the valence-band edge through the luminescence spectra . Also, the Sn 2+ at the Sn 4+ site has a negative site potential, suggesting the very low probability for exciting electrons from the valence band E V into this level . Therefore, this level in the sub-band gap regime results from the oxygen vacancies rather than the Sn 2+ ions.…”

Section: Resultsmentioning

confidence: 97%

Unraveling the Oxygen Effect on the Properties of Sputtered BaSnO₃ Thin Films

Luo

2018

ACS Appl. Electron. Mater.

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The perovskite oxide BaSnO3 is a highly topical material for next-generation transparent conducting semiconductors. The foreign chemical doping strategy is largely used to realize the high conductivity in BaSnO3. Removal of oxygen in BaSnO3 is another route to get high conductivity, but the oxygen vacancy–property relationships have not been realized completely, which is of fundamental importance for the future optoelectronic applications. Here we report how the oxygen vacancies in sputtered BaSnO3 films can account for the structural and chemical environment, the transport phenomena, and the optoelectronic properties. Oxygen vacancies in BaSnO3 films cause the expansion of the unit cell along the out-of-plane direction, enhance the conductivity, transform the electronic transport mechanism from the thermal activation model to the variable-range hopping (VRH) model, and spawn the sub-band level-assisted photoconduction. The present work further strengthens our understanding of the oxygen effect on the physical properties in BaSnO3-based systems.

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“…In both of luminescence and excitation spectra, the emission decreased with increasing temperature of thermal annealing process. In this case, the radiative are probably relative to the emissions of defect centers and the decreasing of luminescence intensity of samples due to decreasing of defects in host [15,20,21]. As discussion in XRD measurement, the phase structures of materials were transformed after the heat treatment at 573 K, in which the forming of BaSnO 3 crystallites due to the removal of a large amount of hydroxyl groups from BaSn(OH) 6 complexes during calcination.…”

Section: Luminescence and Excitation Characteristicsmentioning

confidence: 90%

“…As discussion in XRD measurement, the phase structures of materials were transformed after the heat treatment at 573 K, in which the forming of BaSnO 3 crystallites due to the removal of a large amount of hydroxyl groups from BaSn(OH) 6 complexes during calcination. Moreover, the crystallization process of BaSnO 3 will reduces not only hydroxyl groups but also O-related defects such as non-bridging oxygen, vacancy oxygen [15,20,21] and this process also makes the crystallite structures to be becoming more complete.…”

Section: Luminescence and Excitation Characteristicsmentioning

confidence: 99%

Investigation of Optical Properties on BaSnO<sub>3</sub> Materials

Anh¹,

Thanh²

2017

ujpa

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Perovskite BaSnO 3 materials were synthesized under hydrothermal condition followed heat treatment at variable temperature 423-673 K. Phase structure and morphology and optical properties were characterized. Result showed band gap about 3.31 eV and highly optical transparency in the visible spectral region and average particles size 40-45 nm. Thermal annealing process has affected on phase structure and luminescence in BaSnO 3 material.

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Structural, electrical, and luminescence characteristics of vacuum-annealed epitaxial (Ba,La)SnO3 thin films

Cited by 13 publications

References 21 publications

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

Unraveling the Oxygen Effect on the Properties of Sputtered BaSnO₃ Thin Films

Investigation of Optical Properties on BaSnO<sub>3</sub> Materials

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Structural, electrical, and luminescence characteristics of vacuum-annealed epitaxial (Ba,La)SnO3 thin films

Cited by 13 publications

References 21 publications

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

Unraveling the Oxygen Effect on the Properties of Sputtered BaSnO3 Thin Films

Investigation of Optical Properties on BaSnO<sub>3</sub> Materials

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Unraveling the Oxygen Effect on the Properties of Sputtered BaSnO₃ Thin Films