Nanoscale
·
2023
·Vol. 15
·期 14
·6664-6672
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IF 6.7
Wei Qian,Weitao Qiu,Shanshan Yu,Duan Huang,Renbo Lei,Xianzhen Huang,Shuang Xiao,Xinwei Wang,Shihe Yang
The emergence of organic–inorganic hybrid perovskites with a high μτ product and a high absorption coefficient has made it possible to adopt an aerosol–liquid–solid technology for direct X-ray detectors. The film quality from the ALS process is often compromised, especially on the film surface, when deposited in ambient conditions with uncontrolled humidity. Herein we develop a solvent engineering strategy in the ALS process to obtain high-quality MAPbI3 thick films. The key is the introduction of a molecular additive to intervene and regulate the perovskite crystallization process so that the negative effect of the ALS ambience is minimized. This strategy allows us to prepare direct X-ray detectors with much reduced dark current, enhanced response speed and improved overall performance.
研究领域:
材料科学
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物理学
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医学成像技术
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DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
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IF 14.7
Shi Pengju,Xu Jiazhe,Yavuz Ilhan,Huang Tianyi,Tan Shaun,Zhao Ke,Zhang Xu,Tian Yuan,Wang Sisi,Fan Wei,Li Yahui,Jin Donger,Yu Xuemeng,Wang Chenyue,Gao Xingyu,Chen Zhong,Shi Enzheng,Chen Xihan,Yang Deren,Xue Jingjing,Yang Yang,Wang Rui
Perovskite photovoltaics, typically based on a solution-processed perovskite layer with a film thickness of a few hundred nanometres, have emerged as a leading thin-film photovoltaic technology. Nevertheless, many critical issues pose challenges to its commercialization progress, including industrial compatibility, stability, scalability and reliability. A thicker perovskite film on a scale of micrometres could mitigate these issues. However, the efficiencies of thick-film perovskite cells lag behind those with nanometre film thickness. With the mechanism remaining elusive, the community has long been under the impression that the limiting factor lies in the short carrier lifetime as a result of defects. Here, by constructing a perovskite system with extraordinarily long carrier lifetime, we rule out the restrictions of carrier lifetime on the device performance. Through this, we unveil the critical role of the ignored lattice strain in thick films. Our results provide insights into the factors limiting the performance of thick-film perovskite devices.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1783
·
IF 3.4
Chuanqi Liu,Wen Zhang,Dingyu Yang,Haibo Tian,Jun Zhu
The all-inorganic perovskite cesium lead bromine (CsPbBr3) has attracted much attention in the field of X-ray detectors because of its high X-ray absorption coefficient, high carrier collection efficiency, and easy solution preparation. The low-cost anti-solvent method is the main method to prepare CsPbBr3; during this process, solvent volatilization will bring a large number of holes to the film, leading to the increase of defects. Based on the heteroatomic doping strategy, we propose that Pb2+should be partially replaced by Sr2+to prepare leadless all-inorganic perovskite. The introduction of Sr2+promoted the ordered growth of CsPbBr3in the vertical direction, increased the density and uniformity of the thick film, and achieved the goal of CsPbBr3thick film repairing. In addition, the prepared CsPbBr3and CsPbBr3:Sr X-ray detectors were self-powered without external bias, maintaining a stable response during on and off states at different X-ray dose rates. Furthermore, the detector base on 160 µm CsPbBr3:Sr had a sensitivity of 517.02 µC Gyair−1cm−3at zero bias under the dose rate of 0.955 µGy ms−1and it obtained a fast response speed of 0.053–0.148 s. Our work provides a new opportunity to produce cost-effective and highly efficient self-powered perovskite X-ray detectors in a sustainable way.Keywords:X-ray;self-powered detectors;perovskite thick film;Sr-doped CsPbBr3
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
Barium zirconate titanate (Ba(Zr x Ti 1-x )O 3 ) thick film ceramics were prepared using a tape-casting method. Their structures, morphologies, and electric properties were characterized using XRD , SEM and impedance analysis approaches, respectively. The electrocaloric effects (ECE), i.e., isothermal entropy changes and adiabatic temperature changes, were calculated using a Maxwell relation. It was confirmed by XRD and SEM that the obtained thick film ceramics are pure and dense perovskite structures. The dielectric analyses indicate that the Ba(Zr x Ti 1-x )O 3 thick film ceramics show characteristics of transition from normal to relaxor ferroelectrics with the increasing Zr 4+ ionic content. The polarization – electric field (P-E) hysteresis loops reveal larger polarizations and the ceramics can withstand an electric field as high as 12 MV/m. The adiabatic temperature changes ΔT calculated via the Maxwell relation and the polarization as a function of temperature, which is extracted from the P-E hysteresis loops measured at 12 MV m −1 are from 3.7 to 0.28 K with the increasing Zr 4+ ionic content.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 13
·11945-11951
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IF 2.195
Zhang Ying,Li Yong,Du Jinghua,Sun Ningning,Hao Xihong,Jiang Haitao,Zhai Jiwei
Antiferroelectric (AFE) Pb 0.94 La 0.04 Zr 0.97 Ti 0.03 O 3 (PLZT) thick film was successfully fabricated on nickel foils by using sol–gel method. The film exhibits dense microstructure with low surface roughness and pure perovskite phase. It displays high dielectric constant of 433 at 100 kHz and room temperature, which is 28% larger than that on traditional silicon substrate. Calculated by polarization-field (P–E) hysteresis loop, the recoverable energy-storage density (W rec ) of 18.4 J/cm 3 and the efficiency (Ƞ) value of 54% at 1400 kV/cm are obtained in the thick film. Measured by resistance–inductance–capacitance (RLC) circuit, the maximum pulsed discharge energy-storage density (W dis ) of 12.4 J/cm 3 is found at the same electric field of 1400 kV/cm. Moreover, 90% of the energy is released in a short time of about 84 ns, displaying super-fast discharging characteristic. The AFE film with high discharge energy-storage density and fast discharge time provides strong potential for the application in modern electronics and electrical power systems.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
VACUUM
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2023
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IF 4
Luobin Zhang,Jintao Wang,Sheng Zhou,Xiaojia Luo,Yufeng Li
This research is an attempt to apply the silver thick-film metallization and the soft soldering process to the ultra-high vacuum packaging of atom chips with through silicon via (TSV). During the packaging process, a vacuum environment is used to avoid oxidation of the Cu layer on the chip during heating. At the same time, tin foil is used to protect the inner wall of the glass cell to prevent the gas emitted by the solder from polluting the inner wall. In general, by the adoption of screen printing, sintered surface metallization at a constant temperature of 450–500 °C for 5 min, combined with soft soldering, the packaging of an atom chip with TSV and a silica glass cell is realized. The weld gap is less than 50 μm, the airtightness can reach 8.5 × 10 −13 Pa m 3 /s, and the vacuum degree can reach 2.18 × 10 −8 Pa. That can meet the requirements of cold atom experiment for light path and vacuum degree.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Peng Li,Shuo Gao,Guangrui Lu,Yang Zhao,Jigong Hao,Peng Fu,Juan Du,Wangfeng Bai,Wei Li,Jiwei Zhai
The temperature instability of piezoelectric properties in KNN-based ceramics has been a major bottleneck impeding them toward practical applications. Herein, we prepared multilayer composite ceramics using two kinds of textured thick films with different polymorphic phase transition temperatures. The composite ceramics simultaneously exhibited outstanding piezoelectric properties (d 33 = 400 ± 20 pC/N; S = 0.18 % at 40 kV/cm) and piezoelectric temperature stability (d 33 and S variation within 5 % and 2 %, respectively over the temperature range of room temperature to 180 °C). The synergistic contribution of slightly fluctuating ε r ·P r values, the robust phase and domain structures, and the complementary effect of piezoelectric fluctuation between the two composite layers led to the outstanding temperature stability of piezoelectric properties . Furthermore, the piezoelectric energy harvester produced using KNN-T 1 /T 2 composite ceramics exhibits a large power density of 5.4 mW/cm 3 . These results prove great potential of KNN-T 1 /T 2 ceramics in high temperature piezoelectric devices.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 9
·期 6
·693-702
·
IF 2.889
Xu Jie,Lu Qiling,Lin Jinfeng,Lin Cong,Zheng Xinghua,Lin Tengfei,Wu Xiao
Er 3+ -doped Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 ( x Er-BCTZ, x = 0, 0.005, 0.01, 0.015) multifunctional thick films were prepared by the tape-casting method, using sol-gel-derived nano-sized powders as the matrix material. The surface morphologies, photoluminescence, and electrical properties were investigated. Dense microstructures with pure perovskite structure were obtained in the thick films. By doping an appropriate amount of Er 3− , the samples exhibit superior up-conversion photoluminescence performance and simultaneously enhanced electrical performances. In addition, relatively higher texture fractions (with the largest value of 83.5%) were realized through introducing plate-like BaTiO 3 templates to make the thick film grow by the [001] c orientation. And the ferro-/piezoelectric properties of the thick films were further improved, showing potential in the applications of micro-optoelectronic devices.
研究领域:
材料科学
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光学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9395-9408
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IF 4.5
Lin Yixuan,Qi Xiaoquan,Niu Guoqiang,Sun Qin,Ji Hongjun,Li Mingyu,Li Yufeng
Si 3 N 4 is a promising material for heat dissipation substrate due to its excellent thermal conductivity and mechanical properties. However, its application is limited by the difficulties in surface metallization. In this work, surface metallization of Si 3 N 4 ceramic substrate is realized by thick film method for the first time. Conductive silver paste containing Bi 2 O 3 -B 2 O 3 -ZnO glass frit as glass binder was prepared, and high-performance silver thick films were formed on Si 3 N 4 ceramic surface. The mechanical and electrical properties of silver films were significantly promoted with increasing sintering temperature, and silver films with high shear strength of 23.35 MPa and low resistivity of 3.41 μΩ·cm were obtained when sintered at 600 °C. In the meanwhile, the silver films exist high reliability under thermal cycles. The bonding between the silver thick film and Si 3 N 4 ceramic substrate was considerably enhanced as a result of interfacial reaction, forming Bi 2 Si 2 O 5 phase at the interface during sintering process. The formation mechanism was discussed and it is of great significance for the interfacial design in future studies. The results suggest that thick film method is a promising technology for obtaining high-quality surface metallization for Si 3 N 4 ceramic substrate. Graphical abstract
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 16
·3462
·
IF 5
Yajie Wang,Chaoyue Zhao,Ziqi Cai,Lihong Wang,Liangxiang Zhu,Hui Huang,Guoping Zhang,Peng You,Chen Xie,Yaping Wang,Qing Bai,Tao Yang,Shunpu Li,Guangye Zhang
Organic solar cells (OSCs) have gained increasing attention. Among the various directions in OSCs, all-polymer solar cells (all-PSCs) have emerged as a highly promising and currently active research area due to their excellent film formation properties, mechanical properties, and thermal stabilities. However, most of the high-efficiency all-PSCs are processed from chloroform with an active layer thickness of ~100 nm. In order to meet the requirements for industrialization, a thicker active layer processed from low-vapor pressure solvents (preferentially a hydrocarbon solvent) is strongly desired. Herein, we employ toluene (a hydrocarbon solvent with a much higher boiling point than chloroform) and a method known as sequential processing (SqP) to mitigate the rapid decline in efficiency with increasing film thickness. We show that SqP enables a more favorable vertical phase segregation that leads to less trap-assisted recombination and enhanced charge extraction and lifetime than blend-cast devices at higher film thicknesses.Keywords:all-polymer solar cells;sequential processing;hydrocarbon solvent processing;thick-film active layer
研究领域:
材料科学
·
能源技术
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DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Quansheng Li,Xiaofei Sun,Xuesong Mei,Lingzhi Wang,Minxing Yang,Jianlei Cui,Wenjun Wang
The development of energy storage devices with high energy density relies heavily on thick film electrodes, but it is challenging due to the limited ion transport kinetics inherent in thick electrodes. Here, we report on the preparation of a directional vertical array of micro-porous transport networks on LTO electrodes using a femtosecond laser processing strategy, enabling directional ion rapid transport and achieving good electrochemical performance in thick film electrodes. Various three-dimensional (3D) vertically aligned micro-pore networks are innovatively designed, and the structure, kinetics characteristics, and electrochemical performance of the prepared ion transport channels are analyzed and discussed by multiple characterization and testing methods. Furthermore, the rational mechanisms of electrode performance improvement are studied experimentally and simulated from two aspects of structural mechanics and transmission kinetics. The ion diffusion coefficient, rate performance at 60 C, and electrode interface area of the laser-optimized 60-15% micro-porous transport network electrodes increase by 25.2 times, 2.2 times, and 2.15 times, respectively than those of untreated electrodes. Therefore, the preparation of 3D micro-porous transport networks by femtosecond laser on ultra-thick electrodes is a feasible way to develop high-energy batteries. In addition, the unique micro-porous transport network structure can be widely extended to design and explore other high-performance energy materials.
研究领域:
材料科学
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能源存储技术
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纳米技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Su-Yan Zou,Yu-Hua Huang,Yu-Chuang Fang,Cong-Yi Sheng,Dong-Dong Huang,Dai-Bin Kuang,Xu-Dong Wang
Large-area perovskite (PVK) X-ray detectors exhibit significant potential for commercial applications. However, the production of uniform and dense thick films as well as achieving efficient carrier transport over tens of microns in thick PVK films, remain major challenges for highly sensitive X-ray detection. Herein, an innovative vacuum-assisted blade coating strategy is proposed using PVK inks that strictly controls the nucleation and growth of PVKs to prepare large-area, high-quality MAPbI 3 homojunction thick films. Arising from the formation of a type II homojunction between the top and bottom PVK layers, and effective reduction of the density of defect states, the resultant homojunction film exhibits impressive performances, including an increase in carrier lifetime from 1272 to 9335 ps, an increase in surface photovoltage change from 93 to 386 mV, and nearly three times higher carrier mobility-lifetime product compared with pristine NMP-PVK film. Consequently, the X-ray detector based on homojunction film demonstrates a high sensitivity of 1.3 × 10 5 µC Gy air −1 cm −2 , surpassing the most previously reported values for X-ray detector using blade coating method. This research provides a convenient approach for preparing large-area PVK thick films and establishes a solid foundation for the development of X-ray detection.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
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