Manipulating the carrier concentration and phase transition via Nb content in SrTiO3

Zhu, Zhe; Qian, Peihua; Yang, Xingming; Wu, Baixi; Cai, Hu; Zhang, F. M.; Wu, Xiaoshan

doi:10.1038/s41598-021-03199-7

Cited by 9 publications

(2 citation statements)

References 52 publications

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“…(a1) The STO-based memristor test structure was fabricated on a 5 × 5 mm 2 (001) STO substrate doped with Nb at 0.5 w.%. At this doping level, the substrate material is a degenerate semiconductor with a relatively high charge carrier concentration of more than 1 × 10 20 cm −3 , resulting in a metallic-like resistivity-temperature dependence 34 . The low room-temperature resistivity below 1 × 10 −4 Ωm of the 1 at % Nb-doped STO substrates makes them suitable for use as metallic (“M”) bottom electrodes for the investigated memristor devices.…”

Section: Methodsmentioning

confidence: 99%

Operando two-terminal devices inside a transmission electron microscope

Recalde-Benitez,

Jiang,

Winkler

et al. 2023

Commun Eng

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Advanced nanomaterials are at the core of innovation for the microelectronics industry. Designing, characterizing, and testing two-terminal devices, such as metal-insulator-metal structures, is key to improving material stack design and integration. Electrical biasing within in situ transmission electron microscopy using MEMS-based platforms is a promising technique for nano-characterization under operando conditions. However, conventional focused ion beam sample preparation can introduce parasitic current paths, limiting device performance and leading to overestimated electrical responses. Here we demonstrate connectivity of TEM lamella devices obtained from a novel electrical contacting method based solely on van der Waals forces. This method reduces parasitic leakage currents by at least five orders of magnitude relative to reported preparation approaches. Our methodology enables operation of stack devices inside a microscope with device currents as low as 10 pA. We apply this approach to observe in situ biasing-induced defect formation, providing valuable insights into the behavior of an SrTiO3-based memristor.

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Section: Methodsmentioning

confidence: 99%

Operando two-terminal devices inside a transmission electron microscope

Recalde-Benitez,

Jiang,

Winkler

et al. 2023

Commun Eng

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“…The 2θ angle was scanned from 10 to 120° to cover a wide enough range of structural information on SrTiO 3 . − As Figure S1 illustrates, our XRD measurements clearly show the absence of any phase transformation between 25 and 85 °C. Our result is in good agreement with the existing literature, as structural and phase transformations of SrTiO 3 are not encountered in the utilized range of temperatures, i.e., for temperatures between 25 to 85 °C. − …”

Section: Sample Preparation and The Background Of The Experimental Te...mentioning

confidence: 99%

Multidimensionality of the Contact Potential Difference at the Nanoscale in Inorganic Oxides

Guner

Dagdeviren

2022

ACS Appl. Electron. Mater.

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Inorganic-oxide-based sample systems are popular for applications in catalysis, sensing, renewable energy, and fuel cells, in which electronic properties play important roles. Environmental conditions, e.g., temperature, can greatly impact the electronic properties and thereby the performance. The lack of basic knowledge of the local variation of electronic properties as a function of temperature limits the fundamental understanding of systems and hampers their robustness. Here, we present temperature-dependent scanning probe microscopy experiments to reveal the variation of contact potential difference (CPD) across different length scales. Our measurements demonstrate that the CPD of inorganic perovskites (e.g., SrTiO 3 ) and metal-oxide semiconductors (e.g., TiO 2 ) evolves significantly with temperature. We show that CPD variation depends on the locality of the measurement and originates from a thermodynamically driven intrinsic doping state. These results will facilitate a fundamental understanding of the electronic properties of oxides and thus ease emerging technologies, rationalized by engineering temperature-dependent electronic properties.

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Photocatalytic Enhancement for CO₂ Reduction Using Au Nanoparticles Supported on Fe‐Doped SrTiO_3−δ Perovskite

Valdés‐Hernández,

Luis Domínguez‐Juárez,

Nava‐Mendoza

et al. 2024

Solar RRL

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This study focuses on the use of Au nanoparticles supported on the perovskite doped with Fe ions as a photocatalyst for reduction and methanol production using water as the hydrogen supplier. The photocatalytic evaluation of the synthesized materials shows that Au nanoparticles supported on the perovskites can enhance photocatalytic reduction. The sample with the doping level has the highest methanol production, 9.5 times more than the undoped sample and 3.5 times more than its counterpart without Au nanoparticles. The results of the DFT+U calculations show the contributions from the iron atoms states reduce the energy gap in the perovskite composite, . Additionally, Fe incorporation endows the system with the capacity to create electron‐hole pairs via direct band transitions at the high‐symmetry point R with the doping levels of and .This article is protected by copyright. All rights reserved.

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Manipulating the carrier concentration and phase transition via Nb content in SrTiO3

Cited by 9 publications

References 52 publications

Operando two-terminal devices inside a transmission electron microscope

Operando two-terminal devices inside a transmission electron microscope

Multidimensionality of the Contact Potential Difference at the Nanoscale in Inorganic Oxides

Photocatalytic Enhancement for CO₂ Reduction Using Au Nanoparticles Supported on Fe‐Doped SrTiO_3−δ Perovskite

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Manipulating the carrier concentration and phase transition via Nb content in SrTiO3

Cited by 9 publications

References 52 publications

Operando two-terminal devices inside a transmission electron microscope

Operando two-terminal devices inside a transmission electron microscope

Multidimensionality of the Contact Potential Difference at the Nanoscale in Inorganic Oxides

Photocatalytic Enhancement for CO2 Reduction Using Au Nanoparticles Supported on Fe‐Doped SrTiO3−δ Perovskite

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Product

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Photocatalytic Enhancement for CO₂ Reduction Using Au Nanoparticles Supported on Fe‐Doped SrTiO_3−δ Perovskite