Jingyuan Chu

John Wiley & Sons (United States)

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Zhijian Jin

Shanghai Jiao Tong University

Wei Wu

Shanghai Jiao Tong University

Yue Zhao

Shanghai Jiao Tong University

Zhiyong Hong

Shanghai Jiao Tong University

Jiangtao Shi

North China University of Science and Technology

Guangyu Jiang

Shanghai Jiao Tong University

Hongli Suo

Beijing University of Technology

Zhiwei Zhang

Shanghai Jiao Tong University

Manuela Erbe

Karlsruhe Institute of Technology

Mingyang Wang

Southern Medical University

Cooperative Institutions

Hudson Institute

John Wiley & Sons (United States)

Moss Landing Marine Laboratories

Shanghai Jiao Tong University

University of Illinois Urbana-Champaign

Chinese Academy of Sciences

Wuhan University of Technology

Ministry of Education of the People's Republic of China

University of Chinese Academy of Sciences

Arizona State University

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Supersaturation and Crystallization Behaviors of Rare-Earth Based Cuprate Superconducting Films Grown by Chemical Solution Deposition

SSRN Electronic Journal (2022)

Jiangtao Shi Yue Zhao Yue Wu Manuela Erbe Chunjiang Guo

Chemical solution deposition is widely used in the preparation of rare-earth-based cuprate superconducting thin films, namely RExBa2Cu3O7-y (RE = rare earth element). The crystallographic orientation of the films is strongly dependent on the degree of supersaturation during crystallization. In this paper, we systematically studied the crucial factors affecting supersaturation, such as the type and stoichiometry of the rare earth element and the sintering temperature. Furthermore, the relationship between c-axis orientation and supersaturation was established. The results demonstrate that a small RE ionic radius (e.g., RE = Yb) and reduced RE-stoichiometry, studied on the example of yttrium, are beneficial for the growth of c-axis-oriented films at lower temperatures. In addition, a Y-O/Ba-Cu-O stacked-layer structure was proposed to regulate the diffusion distance to the reaction site. Compared with a Y-Ba-Cu-O single-layer, a c-axis orientation percentage of more than 40% is achieved in the Y-O/Ba-Cu-O stacked-layer at even lower sintering temperatures. The results suggest that a low supersaturation is favorable to promote the growth of c-axis-oriented nuclei and therefore suppresses the growth of random orientations. This paper provides a new strategy to realize orientation modulation of rare-earth-based cuprate superconducting thin films by controlled chemical solution method.

Supersaturation

Deposition

10.2139/ssrn.4209846

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Reduction of Screening Current-Induced Field in a REBCO Coil Wound by Solder-Square-Stacked Wire

IEEE Transactions on Applied Superconductivity (2019)

Mingyang Wang Zhuyong Li Lianhong Zhong Xinhui Duan Meng Song

REBa ₂ Ca ₃ O _7-x (REBCO, RE = rare earth) coated conductors are promising conductors for high magnetic field magnet applications. For REBCO magnets, the tape structures and their superconductive characteristic cause a persistent screening current flowing in the tapes. Due to the existence of the screening current induced field (SCIF), the overall magnetic field becomes unstable and shows a temporal drift. This problem limits the application of REBCO in high-precision magnets, such as MRI and NMR. In this paper, the soldered-stacked-square (3S) REBCO wire is proposed to reduce SCIF. To confirm the reduction effect, a solenoid coil and a benchmark coil were wound by the 3S wire and the commercial 5-mm-wide REBCO tape, respectively. The screening current distributions of 3S wire and 5-mm tape were analyzed. Then, the temporal drift of the overall magnetic field and SCIF hysteresis loop were both experimentally measured for comparison. The test results showed that the 3S wire can significantly reduce the negative effects of SCIF.

Solenoid

Niobium-tin

10.1109/tasc.2019.2905435

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Citations (2)

Issue Information

International Journal of Applied Glass Science (2022)

Sangeetha Sethuraman Karl Franz L Pye Rui M. Almeida Aldo R. Boccaccını

Wiley's Corporate Citizenship initiative seeks to address the environmental, social, economic, and ethical challenges faced in our business and which are important to our diverse stakeholder groups.Since launching the initiative, we have focused on sharing our content with those in need, enhancing community philanthropy, reducing our carbon impact, creating global guidelines and best practices for paper use, establishing a vendor code of ethics, and engaging our colleagues and other stakeholders in our efforts.Follow our progress at www.wiley.com

Displacement field

10.1111/ijag.16586

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Surface engineering of the flexible metallic substrate by SDP‐Gd‐Zr‐O layer for IBAD‐MgO templates

Journal of the American Ceramic Society (2018)

Jingyuan Chu Yue Zhao Guangyu Jiang Wei Wu Zhiwei Zhang

Abstract Tuning substrate properties is an effective methodology to modulate the texture development of MgO films deposited by ion beam‐assisted deposition ( IBAD ) process for epitaxial oxide films. Herein, a solution deposition planarization ( SDP ) technique is employed to deposit Gd‐Zr‐O layer for engineering surface properties of the flexible metal substrate. The correlation between the Gd‐Zr‐O thin film microstructure and the IBAD ‐MgO texture is investigated. The coordinated study on atomic force microscopy ( AFM ) and reflection high‐energy electron diffraction ( RHEED ) reveal that the grain coarsening during high‐temperature sintering negatively influences the texture formation of IBAD ‐MgO. Moreover, the chemical environment of the atoms on the surface of Gd‐Zr‐O seed layer also plays a critical role, which is normally overlooked. The X‐ray photoelectron spectroscopy ( XPS ) analysis indicates that the carbon residue and intermediate phase result in the poor texture of the IBAD ‐MgO. This phenomenon is related to the partial decomposition and synthesis reactions due to the lower sintering temperature or reduced surface to volume ratio. We demonstrate the high‐quality texture of IBAD ‐MgO layer, deposited on mono‐coated thick Gd‐Zr‐O film, by using optimal heat‐treatment conditions. The cross‐sectional TEM images present the dense Gd‐Zr‐O film with Gd 2 Zr 2 O 7 nanograins. The multifunctionalities, such as planarization, a barrier layer, and seed layer, of Gd‐Zr‐O layers are realized in full‐stacked CeO 2 /LaMnO 3 / IBAD ‐MgO/ SDP ‐Gd‐Zr‐O/C276 samples. This work demonstrates a route for simplifying the architecture of 2G‐ HTS using Gd‐Zr‐O layer and explores the effect of the surface properties on texture formation in IBAD ‐MgO layer.

Ion beam-assisted deposition

Texture (cosmology)

10.1111/jace.16159

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Scalable Slot‐Die Coating of Passivation Layers for Improved Performance of Perovskite Solar Cell Modules

Small Methods (2024)

Yanqing Zhu Yuxi Zhang Min Hu Li Wan Wenchao Huang

Abstract Upscaling the perovskite solar cell (PSC) while avoiding losses in the power conversion efficiency presents a substantial challenge, especially when transitioning from ≤1 cm 2 cells to ≥10 cm 2 modules. In addition to the fabrication of key functional layers, scalable technologies for surface passivation, considered indispensable for achieving high‐performance PSCs, are urgently required. However, studies on this topic remain limited. In this study, an industry‐ready slot‐die coating method for the effective passivation of perovskite films as a practical alternative is developed to the spin‐coating procedures commonly used in research. The coating conditions and molecular structure of the passivation agent are systematically optimized to achieve high‐quality film morphology and substantially suppress interface recombination. 2‐chloro‐5‐(trifluoromethyl)‐phenylammonium bromide exhibited the best results, improving the open‐circuit voltage of cells and subcells in a module by 80 ± 4 and 72 ± 10 mV, respectively. Correspondingly, the larger‐area (active area: 10 cm 2 ) modules sustained the highest efficiency of 21.9% under simulated 1‐sun irradiation. The encapsulated devices retained 94% of their initial performances after 750 h of continuous operation. The proposed surface‐passivation slot‐die technology is compatible with high‐throughput processes and is employable for large‐scale PSC fabrication.

Passivation

10.1002/smtd.202401244

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Citations (1)

Insight into the Interfacial Nucleation and Competitive Growth of YBa₂Cu₃O_7−δ Films as High-Performance Coated Conductors by a Fluorine-Free Metal–Organic Decomposition Route

Crystal Growth & Design (2019)

Jingyuan Chu Yue Zhao Mukarram Zaman Khan Xiao Tang Wei Wu

The fluorine-free metal–organic decomposition (FF-MOD) route is one of the table-top methods for the growth of high-quality superconducting YBa2Cu3O7−δ (YBCO) films due to its advantages of being environmentally friendly and having a faster film deposition rate. However, the nucleation and growth mechanism originated during this process are not yet comprehensively understood. In this paper, the microstructural characteristics of YBCO films quenched from different growth stages were investigated, upon which a complete nucleation and growth model is established. A micro-Raman and scanning electron microscopy (SEM) coordinated study demonstrates the coexistence of polycrystalline and epitaxial grains at the early stage of nucleation. Combined analysis of transmission electron microscopy (TEM) and secondary ion mass spectroscopy (SIMS) indicates that YBCO epitaxial nucleates by following the Volmer–Weber growth mode. We observed that as the growth process proceeds, the nuclei at the interface have a significant growth advantage over those in the body, thus leading to coalescence of island epitaxial grains via consuming neighboring polycrystalline grains and intermediate phases. Moreover, by establishing a kinetic phase diagram of YBCO film growth, we also found that the optimal process conditions are mainly related to the enhanced transient liquid phase and BaCeO3, which are somehow associated with the cross-linkage between the sintering temperature, dwell time, and oxygen partial pressure (pO2) of the sintering atmosphere. Remarkably, a high critical current density (Jc) value of 3.6 MA/cm2 (77 K, self-field) was obtained in the YBCO film grown on the CeO2 capped technical substrate deposited under optimized conditions, which is rather comparable with that on the LaAlO3 single crystal. The angular-dependent Jc analysis revealed that the anisotropy of the YBCO film is reduced to 3, as estimated by the Blatter scaling approach, which is much smaller than that of the typical defect-free pristine films. This work improves understanding of the nucleation and growth mechanism in the YBCO film deposited on the CeO2-buffered technical substrate and facilitates the industrialization development of epitaxial oxide films with superior performance in the future.

10.1021/acs.cgd.9b01120

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Citations (27)

Pyrolysis behaviors dominated by the reaction–diffusion mechanism in the fluorine-free metal–organic decomposition process

Journal of Materials Chemistry C (2020)

Jiangtao Shi Yue Zhao Yue Wu Jingyuan Chu Xiao Tang

In this work, pyrolysis behaviors dominated by the reaction–diffusion mechanism were investigated. And one-dimensional reaction–diffusion model is proposed.

Fluorine

10.1039/d0tc03851b

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Citations (8)

Investigation on Current Distribution and Joint Resistance-Overlap Length Relationship for Non-Superconducting Joints

IEEE Transactions on Applied Superconductivity (2018)

Yunhao Pan Wei Wu Shuiliang Zhen Fangliang Dong Longbiao Wang

Low-resistance joint technology is crucial for high-temperature superconducting (HTS) closed-loop coils that work in persistent current mode. The non-uniform current distribution (NUCD) phenomenon in HTS joint has a significant influence on joint resistance, which may lead to a nonlinear relationship between joint resistance Rj and overlap length l (Rj-l curve) instead of following the laws of resistance. In this paper, an arched structure joint made by YBCO tapes has been designed to provide a direct evidence for the NUCD phenomenon inside solder joint. It is found that the current transports mainly at the end of the overlap area and is much different from the regular conductors. The V/I-I method is proposed to measure Rj of solder joints (less than 2 nΩ) with various overlap lengths in order to obtain more precise data. A complete Rj-l curve (l = 5-100 cm) has been successfully illustrated and a nonlinear saturation relationship between Rj and l is presented. The joint resistance tends to approach to a lower limit value about 1.5-1.6 nΩ when the overlap length exceeds 20 cm.

Contact resistance

10.1109/tasc.2018.2884915

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Citations (3)

Influence of Seed Layer Materials on the Texture of IBAD-MgO Layer

IEEE Transactions on Applied Superconductivity (2018)

Jingyuan Chu Yue Zhao Shuiliang Zhen Guangyu Jiang Yongchun Chen

Recently, the solution deposition planarization (SDP) technique for deposition of oxide layer for the IBAD-MgO template has attracted more attentions. Although the texturing mechanism of IBAD-MgO is still under debate, it is accepted that the seed-layer (the one close to the MgO) should fulfill several requirements, such as atomic flatness surface as well as material composition. In this work, in order to clarify the influence of SDP-seed layer materials on the texture of IBAD-MgO layer, we chose Gd–Zr–O, Gd ₂ O ₃ , ZrO ₂ , and Y ₂ O ₃ as seed layer materials. Atomic force microscopy (AFM), X-ray diffractometer (XRD), and reflection high energy electron diffraction (RHEED) were used to illustrate the correlation between the microstructure of the seed layer and the texture of IBAD-MgO film. AFM analysis shows that the atomic flatness was achieved on all the SDP films, as evidenced by the RMS value of around 0.3 nm on the 1 × 1 μm ² grid area. RHEED results show that the poor texture of IBAD-MgO is present when using Gd ₂ O ₃ and ZrO ₂ as seed layer. Like Y ₂ O ₃ , the SDP-GZO film as a seed layer exhibits good compatibility with IBAD-MgO. In addition, the XRD result on Gd–Zr–O xerogel powder implies that the films mainly consist of nanocrystalline Gd ₂ Zr ₂ O ₇ , which is a crucial feature of an efficient barrier layer. Eventually, a J _c value of 1.65 MA·cm ⁻² (at 77 K, s.f. ) was achieved on a full stack of YBCO/CeO ₂ /IBAD-MgO/SDP-layer/C276 sample.

Texture (cosmology)

10.1109/tasc.2018.2804957

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Citations (5)

Structural and superconducting characteristics of YBa2Cu3O7 films grown by fluorine-free metal-organic deposition route

Acta Materialia (2017)

Yue Zhao Jingyuan Chu T. Qureishy Wei Wu Zhiwei Zhang

Stacking fault

Texture (cosmology)

10.1016/j.actamat.2017.11.050

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Citations (26)