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Isotropic sintering shrinkage of 3D glass-ceramic nanolattices:backbone preforming and mechanical enhancement

International Journal of Extreme Manufacturing 2024年第2期6卷 418-426页

作者： Nianyao Chai Yunfan Yue Xiangyu Chen zhongle zeng Sheng Li Xuewen Wang Center of Femtosecond Laser Manufacturing for Advanced Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People’s Republic of China National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu LaboratoryFoshan 528000People’s Republic of China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070People’s Republic of China

There is a perpetual pursuit for free-form glasses and ceramics featuring outstanding mechanical properties as well as chemical and thermal *** is a promising idea to shape inorganic materials in three-dimensional(3D)forms to reduce their weight while maintaining high mechanical properties.A popular strategy for the preparation of 3D inorganic materials is to mold the organic–inorganic hybrid photoresists into 3D micro-and nano-structures and remove the organic components by subsequent ***,due to the discrete arrangement of inorganic components in the organic-inorganic hybrid photoresists,it remains a huge challenge to attain isotropic shrinkage during ***,we demonstrate the isotropic sintering shrinkage by forming the consecutive–Si–O–Si–O–Zr–O–inorganic backbone in photoresists and fabricating 3D glass–ceramic nanolattices with enhanced mechanical *** femtosecond(fs)laser is used in two-photon polymerization(TPP)to fabricate 3D green body *** subsequent sintering at 1000℃,high-quality 3D glass–ceramic microstructures can be obtained with perfectly intact and smooth ***-suit compression experiments and finite-element simulations reveal that octahedral-truss(oct-truss)lattices possess remarkable adeptness in bearing stress concentration and maintain the structural integrity to resist rod bending,indicating that this structure is a candidate for preparing lightweight and high stiffness glass–ceramic nanolattices.3D printing of such glasses and ceramics has significant implications in a number of industrial applications,including metamaterials,microelectromechanical systems,photonic crystals,and damage-tolerant lightweight materials.

关键词： 3D printing isotropic shrinkage femtosecond laser two-photon polymerization structural glass-ceramics

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Photoexcitation-induced passivation of SnO2 thin film for efficient perovskite solar cells

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National Science Review 2023年第11期10卷 183-191页

作者： Nianyao Chai Xiangyu Chen zhongle zeng Ruohan Yu Yunfan Yue Bo Mai Jinsong Wu Liqiang Mai Yi-Bing Cheng Xuewen Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

A high-quality tin oxide electron transport layer(ETL) is a key common factor to achieve high-performance perovskite solar cells(PSCs). However, the conventional annealing technique to prepare high-quality ETLs by continuous heating under near-equilibrium conditions requires high temperatures and a long fabrication time. Alternatively, we present a non-equilibrium, photoexcitation-induced passivation technique that uses multiple ultrashort laser pulses. The ultrafast photoexcitation and following electron–electron and electron–phonon scattering processes induce ultrafast annealing to efficiently passivate surface and bulk defects, and improve the crystallinity of Sn O2, resulting in suppressing the carrier recombination and facilitating the charge transport between the ETL and perovskite interface. By rapidly scanning the laser beam, the annealing time is reduced to several minutes, which is much more efficient compared with conventional thermal annealing. To demonstrate the university and scalability of this technique, typical antisolvent and antisolvent-free processed hybrid organic–inorganic metal halide PSCs have been fabricated and achieved the power conversion efficiency(PCE) of 24.14% and 22.75% respectively, and a12-square-centimeter module antisolvent-free processed perovskite solar module achieves a PCE of 20.26%,with significantly enhanced performance both in PCE and stability. This study establishes a new approach towards the commercialization of efficient low-temperature manufacturing of PSCs.

关键词： photoexcitation-induced passivation ultrafast laser carrier management electron transport layer perovskite solar cells

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氧化锡陶瓷的飞秒激光3D非线性光刻

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Science China Materials 2021年第6期64卷 1477-1484页

作者：柴年垚刘亚男岳云帆魏平王学文赵俊杰张奇黄福志曾终乐甘棕松麦立强程一兵 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryFoshan 528216China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

氧化锡是一种宽带隙半导体材料,广泛用于气体传感、光电和催化等领域.微米级至纳米级的复杂三维几何结构使传统的氧化锡陶瓷具有新的特性和功能.由于具有高的机械韧性和强度,陶瓷不易铸造或加工.增材制造为陶瓷材料灵活的几何造型带来... 详细信息

氧化锡是一种宽带隙半导体材料,广泛用于气体传感、光电和催化等领域.微米级至纳米级的复杂三维几何结构使传统的氧化锡陶瓷具有新的特性和功能.由于具有高的机械韧性和强度,陶瓷不易铸造或加工.增材制造为陶瓷材料灵活的几何造型带来了巨大的机会,但是极高的熔化温度使其在普通的3D打印方法上更加困难,而在微米或纳米尺度任意成形氧化锡陶瓷始终是一个挑战.本文中,我们利用在超快激光辐照下聚合的陶瓷前驱体,形成复杂且任意的3D陶瓷聚合物结构,通过煅烧处理后转变为具有均匀收缩率的高密度纯氧化锡陶瓷,特征尺寸可降至亚微米.透射电子显微镜(TEM)分析显示,氧化锡陶瓷纳米晶体的晶粒尺寸为2.5±0.4 nm.这项工作为制造精度高达亚百纳米的任意3D氧化锡陶瓷纳米结构提供了可能性,从而使其在不同领域更具应用前景.

关键词： tin oxide ceramics nonlinear photolithography femtosecond laser

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