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A multiband NIR upconversion core-shell design for enhanced light harvesting of silicon solar cells

Light(science & Applications) 2024年第12期13卷 3261-3271页

作者： Yue Wang Wen Xu Haichun Liu Yuhan Jing Donglei Zhou Yanan Ji Jerker Widengren Xue Bai Hongwei Song State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University130012 ChangchunChina Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission School of Physics and Materials EngineeringDalian Minzu UniversityDalian 116600China Department of Applied Physics KTH Royal Institute of TechnologySE-10691 StockholmSweden

Exploring lanthanide light upconversion(UC)has emerged as a promising strategy to enhance the near-infrared(NIR)responsive region of silicon solar cells(SSCs).However,its practical application under normal sunlight conditions has been hindered by the narrow NIR excitation bandwidth and the low UC efficiency of conventional ***,we report the design of an efficient multiband UC system based on Ln^(3+)/Yb^(3+)-doped core-shell upconversion nanoparticles(Ln/Yb-UCNPs,Ln^(3+)=Ho^(3+),Er^(3+),Tm^(3+)).In our design,Ln^(3+)ions are incorporated into distinct layers of Ln/Yb-UCNPs to function as near-infrared(NIR)absorbers across different spectral *** design achieves broad multiband absorption withtin the 1100 to 2200 nm range,with an aggregated bandwidth of~500 *** have identified a synthetic electron pumping(SEP)effect involving Yb^(3+)ions,facilitated by the synergistic interplay of energy transfer and cross-relaxation between Yb^(3+)and other ions Ln^(3+)(Ho^(3+),Er^(3+),Tm^(3+)).This SEP effect enhances the UC efficiency of the nanomaterials by effectively transferring electrons from the low-excited states of Ln^(3+)to the excited state of Yb^(3+),resulting in intense Yb^(3+)luminescence at~980 nm within the optimal response region for SSCs,thus markedly improving their overall *** SSCs integrated with Ln/Yb-UCNPs with multiband excitation demonstrate the largest reported NIR response range up to 2200 nm,while enabling the highest improvement in absolute photovoltaic efficiency reported,with an increase of 0.87%(resulting in a total efficiency of 19.37%)under standard AM 1.5 G *** work tackles the bottlenecks in UCNP-coupled SSCs and introduces a viable approach to extend the NIR response of SSCs.

关键词： excited excitation absorber

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Photocatalytic activity enhancement with 4-trifluoromethylphenylacetylene-functionalized Cu2O cubes and rhombic dodecahedra from band structure modulation and use in boronic acid hydroxylation

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Journal of materials Chemistry A 2024年第9期12卷 5429-5438页

作者： Chien, Kuo-Chang Yu, Wei-Yang Kao, Jui-Cheng Lo, Yu-Chieh Chou, Jyh-Pin Huang, Michael H. Department of Chemistry National Tsing Hua University Hsinchu30013 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Physics National Changhua University of Education Changhua50007 Taiwan

Surface 4-trifluoromethylphenylacetylene (4-TFMA) functionalization enables inert Cu2O cubes to exhibit a good photocatalytic activity. The modified rhombic dodecahedra also showed enhanced photocatalytic activity, but decorated octahedra actually delivered activity suppression. Scavenging experiments reveal that holes are more important than electrons for the photocatalytic activity of the functionalized cubes. Electron paramagnetic resonance (EPR) data agree with the observed photocatalysis results. Density functional theory (DFT) calculations disclose the emergence of one and two 4-TFMA-derived narrow bands within the band gap of the respective {110} and {100} surfaces of Cu2O to promote electron transfer through the molecule to the solution for radical generation, but no such band is present for the functionalized Cu2O {111} surface. Bader charge difference analysis also suggests promotion of charge transfer through 4-TFMA for the {100} and {110} surfaces of Cu2O, but the modification is less helpful over the {111} surface. The modified Cu2O cubes can also improve photocatalyzed arylboronic acid hydroxylation reactions. Conjugated molecular functionalization on semiconductor crystals is a powerful strategy for greatly enhancing electron transfer. © 2024 The Royal Society of Chemistry.

关键词： Photocatalytic activity

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Ronchigram Simulation and Aberration Correction Training using ***

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1911-1912页

作者： Millsaps, William Sung, Suk Hyun Schnitzer, Noah Kourkoutis, Lena F. Hovden, Robert Engineering Physics Program University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering Cornell University Ithaca NY United States School of Applied and Engineering Physics Cornell University Ithaca NY United States Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca NY United States

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Effect of Surface Roughness on the Magnetism, Nano-indentation, Surface Energy, and Electrical Properties of Co60Fe20Dy20 Films on Si (100) Substrate

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Journal of Electronic materials 2024年第4期53卷 1752-1762页

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Lin, Chih-Chien Chen, Pei-Ling Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung City80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

In this study, we focused on depositing a target material, cobalt-iron-dysprosium (Co60Fe20Dy20), onto silicon (Si) (100) substrates with thickness varying from 10 nm to 50 nm through a direct-current (DC) magnetron sputtering technique. The subsequent step involved subjecting the samples to an hour-long annealing process in a vacuum annealing furnace at temperatures of 100°C, 200°C, and 300°C. To assess the elemental composition of the CoFeDy films, energy-dispersive X-ray spectroscopy (EDS) was employed. An observed trend indicated an increase in low-frequency alternating-current magnetic susceptibility (χac) with the increasing thickness. Remarkably, the CoFeDy films exhibited their peak χac following annealing at 300°C, with an optimal resonance frequency of 50 Hz. After annealing at 300°C, the CoFeDy film’s surface energy peaked at 50 nm. The magnetic, electrical, and adhesive properties of the CoFeDy films were notably influenced by surface roughness at different annealing temperatures. Atomic force microscopy (AFM) analysis revealed a gradual reduction in film roughness post-annealing, corresponding to smoother surfaces indicative of a weaker domain wall pinning effect, heightened carrier conductivity, and increased liquid spreading. Collectively, these outcomes contributed to diminished χac, reduced electrical resistance, and enhanced adhesion. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Adhesion

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Topology Effect on Order-Disorder Transition of High-χ Block Copolymers

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Macromolecules 2024年第15期57卷 7087-7097页

作者： Chang, Cheng-Yen Manesi, Gkreti-Maria Xie, Jiayu Shi, An-Chang Shastry, Thanmayee Avgeropoulos, Apostolos Ho, Rong-Ming Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Materials Science Engineering University of Ioannina University Campus Ioannina45110 Greece Department of Physics and Astronomy McMaster University HamiltonONL8S 4M1 Canada

This work aims to systematically examine the topology effect on the self-assembly of block copolymers. Compositionally, symmetric polystyrene-block-polydimethylsiloxane block copolymers (BCPs) with different chain topologies (diblock, three-arm star-block, and four-arm star-block) and various molecular weights are synthesized. These purposely designed block copolymers are used as a model system to investigate the topology effect on order-to-disorder transition temperature (TODT) by temperature-resolved small-angle X-ray scattering experiments. An increase of the TODT is observed when the arm number of BCPs with equivalent arm length (i.e., molecular weight) is increased from one to four. Based on the random-phase approximation (RPA), Flory-Huggins interaction parameter (χ) is determined from the regression of the measured TODT. The observation by differential scanning calorimetry also demonstrates the shifting of the endothermic peak from the order-to-disorder transition of star-blocks to the higher temperature region, consistent with the scattering experiments and the RPA prediction. © 2024 The Authors. Published by American Chemical Society.

关键词： Block copolymers

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Experimental and theoretical studies on two-dimensional vanadium carbide hybrid nanomaterials derived from V_(4)AlC_(3) as excellent catalyst for MgH_(2)

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Journal of Magnesium and Alloys 2023年第10期11卷 3790-3799页

作者： Zhiqiang Lan Huiren Liang Xiaobin Wen Jiayang Hu Hua Ning Liang Zeng Haizhen Liu Jun Tan Jürgen Eckert Jin Guo Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologySchool of Physical Science and TechnologyGuangxi UniversityNanning 530004PR China College of mathematics and Physics Guangxi Minzu UniversityNanning 530006PR China College of Materials Science and Engineering Chongqing UniversityChongqing 400044PR China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department Materials Physics Montanuniversität LeobenJahnstraße 12Leoben A-8700Austria National University of Science and Technology«MISiS» LeninskyProsp.4Moscow 119049Russia

Hydrogen is considered one of the most ideal future energy *** safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen *** the current investigation,two-dimensional vanadium carbide(VC) was prepared by an etching method using V_(4)AlC_(3) as a precursor and then employed to enhance the hydrogen storage properties of MgH_(2).The studied results indicate that VC-doped MgH_(2) can absorb hydrogen at room temperature and release hydrogen at 170℃. Moreover,it absorbs 5.0 wt.%of H_(2) within 9.8 min at 100℃ and desorbs 5.0 wt.% of H_(2) within 3.2 min at 300℃.The dehydrogenation apparent activation energy of VC-doped MgH_(2) is 89.3 ± 2.8 kJ/mol,which is far lower than that of additive-free MgH_(2)(138.5 ± 2.4 kJ/mol),***-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break,which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms,thus,the hydrogen storage properties of MgH_(2) are remarkable improved through addition of VC.

关键词： MgH_2 Two-dimensional Hydrogen storage material Density functional theory

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Microstructural evolution in lithium plating process and its effect on the calendar storage life

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Nano Research 2024年第10期17卷 8834-8841页

作者： Ki Hwan Koh Dong Ju Lee Anthony Mu Kangwoon Kim Taehee Kim Zheng Chen Department of Chemical and Nano Engineering University of California San DiegoLa JollaCA 92093USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Sustainable Power and Energy Center University of California San DiegoLa JollaCA 92093USA

The growing demand for electric vehicles highlights the need for energy storage solutions with higher densities,spotlighting Li metal anodes as potential successors to traditional Li-ion batteries(LIBs).Achieving longer calendar aging life for Li metal anodes is crucial for their practical use,given their propensity for corrosion due to a low redox potential,which leads to compromised cycling stability and significant capacity loss during *** research investigated that this susceptibility is mainly dependent on the surface area of Li metal anode and the properties of the solid electrolyte interphase(SEI),particularly its stability and growth *** research adds to this understanding by demonstrating that the amount of Li plating is a key factor in its corrosion during open-circuit storage,as assessed across various *** discovered that increasing the Li plating amount effectively reduces Coulombic efficiency(C.E.)loss during aging,due to a lower surface area-to-Li *** implies that the choice of electrolyte for optimal storage life should consider the amount of Li plating,with higher capacities promoting better storage characteristics.

关键词： lithium metal batteries anode-free batteries calendar life of batteries lithium anode corrosion

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Electronic and optical properties of the fully and partially inverse CoFe2O4 spinel from first principles calculations including many-body effects

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Physical Review B 2024年第19期109卷 195172-195172页

作者： Shohreh Rafiezadeh Vijaya Begum-Hudde Rossitza Pentcheva Department of Physics and Center for Nanointegration Duisburg-Essen (CENIDE) Department of Materials Science and Engineering

Using density functional theory calculations and many-body perturbation theory, we investigate the electronic and optical properties of the inverse spinel CoFe2O4, a common anode material for photocatalytic water splitting. Starting with different exchange-correlation functionals, at the independent particle (IP) level we obtain a direct band gap of 1.38 eV (PBE+U, U=4 eV) and 1.69 eV (SCAN+ U, U=3 eV), whereas HSE06 renders an indirect band gap of 2.02 eV. Including quasiparticle effects within G0W0, a larger and indirect band gap is obtained for all functionals: 1.78 eV (PBE+U, U=4 eV), 1.95 eV (SCAN+ U, U=3 eV), and 2.17 eV (HSE06). Excitonic effects, taken into account by solving the Bethe-Salpeter equation (BSE), lead to a redshift of the optical band gap to 1.50 (SCAN+ U, U=3 eV) and 1.61 eV (HSE06), in good agreement with the reported experimental values 1.50–2.0 eV. We also explored the effect of the degree of inversion: while the band gap decreases at the IP level, including excitonic effects leads to an increase from 1.50 (x=1) to 1.57 (x=0.5), and 1.64 eV (x=0). The lowest optical transitions in the visible range, identified based on the oscillator strength, are at 2.0, 3.5, and 5.0 eV for the inverse spinel, consistent with the experimental values at 2.0, 3.4, and 4.9 eV. Both x=0.0 and x=0.5 exhibit transitions below 1 eV with extremely small oscillator strengths that are absent in the inverse spinel. This corroborates previous suggestions that these transitions are related to the presence of Co2+ cations at the tetrahedral sites.

关键词： Electronic structure Excitons First-principles calculations Magnetic insulators Band structure methods GW method

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Temperature-Dependent Anisotropy and Two-Band Superconductivity Revealed by Lower Critical Field in Organic Superconductorκ-(BEDT-TTF)_(2)Cu[N(CN)_(2)]Br

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Chinese physics Letters 2023年第6期40卷 56-62页

作者：睦惠景司进杨琴珪相英杨海朋闻海虎 National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China College of Materials Science and Engineering Shenzhen Key Laboratory of Polymer Science and TechnologyShenzhen UniversityShenzhen 518060China

Resistivity and magnetization have been measured at different temperatures and magnetic fields in organic superconductorsκ-(BEDT-TTF)_(2)Cu[N(CN)_(2)]*** lower critical field and upper critical field are determined,which allow to depict a complete phase *** the comparison between the upper critical fields with magnetic field perpendicular and parallel to the conducting ac-planes,and the scaling of the in-plane resistivity with field along different directions,we find that the anisotropyΓis strongly dependent on *** is realized thatΓis quite large(above 20)near Tc,which satisfies the 2D model,but approaches a small value in the low-temperature *** 2D-Tinkham model can also be used to fit the data at high *** is explained as a crossover from the orbital depairing mechanism in high-temperature and low-field region to the paramagnetic depairing mechanism in the high-field and low-temperature *** temperature dependence of lower critical field,Hc1(T),shows a concave shape in wide temperature *** is found that neither a single d-wave nor a single s-wave gap can fit the Hc1(T),however a two-gap model containing an s-wave and a d-wave can fit the data rather well,suggesting two-band superconductivity and an unconventional pairing mechanism in this organic superconductor.

关键词： temperature satis directions

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Rational strategy for power doubling of monolithic multijunction Ⅲ-Ⅴ photovoltaics by accommodating attachable scattering waveguides

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Light(science & Applications) 2024年第11期13卷 2734-2744页

作者： Shin Hyung Lee Hyo Jin Kim Jae-Hyun Kim Gwang Yeol Park Sun-Kyung Kim Sung-Min Lee School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Optoelectronic Convergence Research Center Korea Photonics Technology InstituteGwangju 61007Republic of Korea Department of Applied Physics Kyung Hee UniversityYongin 17104Republic of Korea Department of Electrical Engineering Hanyang UniversitySeoul 04763Republic of Korea Division of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea

While waveguide-based light concentrators offer significant advantages,their application has not been considered an interesting option for assisting multijunction or other two-terminal tandem solar *** this study,we present a simple yet effective approach to enhancing the output power of transfer-printed multijunction InGaP/GaAs solar *** utilizing a simply combinable waveguide concentrator featuring a coplanar waveguide with BaSO4 Mie scattering elements,we enable the simultaneous absorption of directly illuminated solar flux and indirectly waveguided *** deployment of cells is optimized for front-surface photon collection in monofacial *** systematic comparisons across various waveguide parameters,supported by both experimental and theoretical quantifications,we demonstrate a remarkable improvement in the maximum output power of a 26%-efficient cell,achieving an enhancement of~93%with the integration of the optimal scattering ***,a series of supplementary tests are conducted to explore the effective waveguide size,validate enhancements in arrayed cell module performance,and assess the drawbacks associated with rear *** findings provide a comprehensive understanding of our proposed approach towards advancing multi-junction photovoltaics.

关键词： waveguide scattering power

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