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International Conference on Display technology, ICDT 2021

作者： Ying, Lei Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou510640 China

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The 3,6-Dimethoxythieno[3,2-B]Thiophene-Based Bifunctional Electrodes for High-Performance Electrochromic Supercapacitors Prepared by One-Step Electrodeposition

SSRN

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SSRN 2024年

作者： Yu, Zhixuan Wang, Rui Tang, Huayu Zheng, Ding Yu, Junsheng State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China

An integrated visual energy system consisting of conjugated polymer electrodes is promising for combining electrochromism with energy storage. In this work, we obtained copolymer bifunctional electrodes poly(3,6-dimethoxythieno[3,2-b]thiophene-co-2,3-dihydrothieno[3,4-b][1,4]dioxin-3-ylmethanol)(P(TT-OMe-co-EDTM)) by one-step electrochemical copolymerization, which exhibits favorable electrochromic and capacitive energy storage properties. Owing to the synergistic effect of PTT-OMe and PEDTM, the prepared copolymers show better flexibility. In addition, the morphology and electrochemical properties of the copolymers could be tuned by depositing different molar ratios of 3,6-dimethoxythieno[3,2-b]thiophene (TT-OMe) and 2,3-dihydrothieno[3,4-b][1,4] dioxin-3-ylmethanol (EDTM). The resulted P(TT-OMe-co-EDTM) electrodes achieved high specific capacitance (190 F/g at 5 mV/s), recognizable and tunable color conversion. This work provides a novel and simple pathway to synergistically improve electrochromic and energy storage properties and develop thiophene-based conducting polymers for electrochromic energy storage devices. © 2024, The Authors. All rights reserved.

关键词： Electrochromism

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Trilayer multi-orbital models of La4Ni3O10

arXiv

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arXiv 2024年

作者： Chen, Cui-Qun Luo, Zhihui Wang, Meng Wú, Wéi Yao, Dao-Xin Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou510275 China

Recently, the discovery of superconductivity in Ruddlesden-Popper (RP) La4Ni3O10 under pressure has further expanded the realm of nickelate-based superconductor family. In this paper, we performed a first-principle study of La4Ni3O10 for both P21/a phase at ambient pressure and I4/mmm phase at high pressure, with U=0, 3.5 eV. Our results confirmed the characteristic upward shift of Ni-dz2 bonding band under pressure. Moreover, our analysis of electronic spectrum and orbital occupancy unveil the dynamic mechanism of electronic reconstructions under pressure, embedded in a critical dual effect. Based on our results, we further proposed a trilayer two-orbital model by performing Wannier downfolding on Ni-eg orbitals. Our model reveals four Fermi surface sheets with α, β, β′, γ pockets, bearing resemblance to that of bilayer La3Ni2O7. According to the model, our calculated spin susceptibility under random phase approximation shows that dx2−y2 orbital is also important for the magnetic fluctuation in RP series. Finally, a high energy sixteen-orbital model with direct dp, pp hoppings is proposed, which implies that La4Ni3O10 also lies in charge-transfer picture within Zaanen-Sawatzky-Allen scheme. Our exposition of electronic reconstructions and multi-orbital models shed light on theoretical electronic correlation study and experimental exploration of lower pressure superconductor in RP series. © 2024, CC0.

关键词： Nickel compounds

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A solution-processed nanoscale COF-like material towards optoelectronic applications

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Science China Chemistry 2021年第1期64卷 82-91页

作者： Qiang Fu Ting Wang Yanna Sun Nan Zheng Zengqi Xie Di Lu Zhiyuan Xu Xiangjian Wan Yamin Zhang Yongsheng Liu The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China Renewable Energy Conversion and Storage Center Nankai UniversityTianjin 300071China

Two-dimensional(2 D)covalent organic frameworks(COFs)with periodic functionalπ-electron systems are an emerging class of optoelectronic ***,almost all conjugated COFs so far are insoluble and hard to process,which hampers severely their optoelectronic ***,a solution-processable,nanoscale and sp2 carbon-conjugated COF-like material,PDPP-C20 was successfully designed and *** solution-processed PDPP-C20 films exhibit high crystallinity and excellent charge transport properties along out-of-plane directions,combined with the highest occupied molecular orbital(HOMO)/lowest unoccupied molecular orbital(LUMO)levels of-5.36/-3.75 e V,making PDPP-C20 suitable for electronic device *** efficiency as high as 21.92%has been demonstrated when it was used as a functional interfacial layer in perovskite solar cells,coupled with dramatically improved stability in comparison with the control device due to the superior hydrophobicity of PDPP-C20 layer as well as its passivation effect on perovskite ***,the soluble PDPP-C20 could also be used as donor in bulk-heterojunction organic solar cells and an initial efficiency of 2.46%has been *** results indicate that this new class of soluble and nanoscale COF-like materials should offer a new arena of functional materials for optoelectronic devices.

关键词： solution-processable covalent organic frameworks perovskite solar cells mobility passivation

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Magnetic phase transitions in the triangular-lattice spin-1 dimer compound K2Ni2(SeO3)3

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Physical Review B 2024年第21期109卷 214430-214430页

作者： Lei Yue Ziyou Lu Kun Yan Le Wang Shu Guo Ruixin Guo Peng Chen Xiaobin Chen Jia-Wei Mei Department of Physics School of Science and State Key Laboratory on Tunable Laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Institute for Quantum Science and Engineering International Quantum Academy Shenzhen 518048 China Dongguan Guangdong 523808 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices

In our study, we conduct magnetization and heat capacity measurements to investigate field-induced magnetic phase transitions within the newly synthesized compound K2Ni2(SeO3)3, a spin-1 dimer system arranged on a triangular lattice. From our first-principles simulations, we determine that the spin system in K2Ni2(SeO3)3 can be represented as a two-dimensional triangular-lattice spin-1 dimer model, including an intra-dimer exchange of J1=0.32meV, an inter-dimer exchange of J2=0.79meV, and an easy-axis anisotropy of D=0.14meV. The presence of easy-axis magnetic anisotropy explains the distinct magnetic phase diagrams observed under c-axis directional and in-plane magnetic fields. Notably, our investigation unveils a two-step phase transition with the magnetic field aligned with the c direction. Our findings yield valuable insights into the magnetic phase transitions inherent to geometrically frustrated magnetic systems featuring dimer structures.

关键词： Frustrated magnetism Magnetic phase transitions Triangular lattice Magnetization measurements Specific heat measurements X-ray diffraction

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The 3,6-Dimethoxythieno[3,2-B]Thiophene-Based Bifunctional Electrodes for High-Performance Electrochromic Supercapacitors Prepared by One-Step Electrodeposition

SSRN

引用

SSRN 2024年

An integrated visual energy system consisting of conjugated polymer electrodes is promising for combining electrochromism with energy storage. In this work, we obtained copolymer bifunctional electrodes poly(3,6-dimethoxythieno[3,2-b]thiophene-co-2,3-dihydrothieno[3,4-b][1,4]dioxin-3-ylmethanol)(P(TT-OMe-co-EDTM)) by one-step electrochemical copolymerization, which exhibits favorable electrochromic and capacitive energy storage properties. Because of the synergistic effect of PTT-OMe and PEDTM, the prepared copolymers show better flexibility. Moreover, the morphology and electrochemical properties of the copolymers could be adjusted by depositing different molar ratios of 3,6-dimethoxythieno[3,2-b]thiophene (TT-OMe) and 2,3-dihydrothieno[3,4-b][1,4] dioxin-3-ylmethanol (EDTM). The P(TT-OMe-co-EDTM) electrodes realized high specific capacitance (190 F/g at 5 mV/s), recognizable and tunable color conversion. This work provides a novel and simple way to synergistically improve electrochromic and energy storage properties and develop thiophene-based conducting polymers for electrochromic energy storage devices. © 2024, The Authors. All rights reserved.

关键词： Electrochromism

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High Performance Hydrogen Sensors Based on Tellurium Nanobelt Field-Effect Transistors

High Performance Hydrogen Sensors Based on Tellurium Nanobel...

引用

IEEE SENSORS

作者： Yu Guo Jianping Zhang Zhen Yuan Huiling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China (UESTC) Chengdu China

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

Tellurium (Te), a p-type semiconductor with high carrier mobility, is particularly advantageous for field-effect transistor (FET) applications. In this study, a high-performance FET-type hydrogen sensor utilizing Te nanobelts was developed. The sensor was fabricated with a palladium (Pd) gate, specifically chosen for its sensitivity to hydrogen, enhancing both selectivity and response. The results indicate a short response time of ~2 s to 4% H 2 , a detection limit as low as 50 ppm, and negligible cross-sensitivity at room temperature, highlighting the potential of Te in advancing gas sensor technology. Furthermore, the flexible FET design is expected to detect various gases, broadening the application potential of Te-based gas sensors.

关键词： Temperature sensors Sensitivity Hydrogen Field effect transistors Logic gates Palladium Sensors Time factors Gas detectors Tellurium

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Polarization splitter-rotator on thin film lithium niobate based on multimode interference

arXiv

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arXiv 2024年

作者： Wang, Mengke Yao, Hao Deng, Jiayao Hu, Zhefeng Tang, Tingting Chen, Kaixin School of optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China Optoelectronic Sensor Devices and Systems Key Laboratory of Sichuan Provincial University Chengdu University of Information Technology Sichuan Chengdu610225 China

Polarization splitter-rotators (PSRs) are the key elements to realize on-chip polarization manipulation. Current PSRs on thin film lithium niobate (TFLN) rely on sub-micron gaps to realize modes separation, which increase the difficulties of lithography and etching. In this paper, a polarization splitter-rotator on TFLN based on multimode interference (MMI) is demonstrated. Mode division is achieved by an MMI-based mode demultiplexer. The feature size of the PSR is 1.5 μm, which can be fabricated with low priced i-line contact aligners. Experimental results show a polarization extinction ratio (PER) > 20 dB and insertion loss (IL) 9.5 dB and an IL Copyright © 2024, The Authors. All rights reserved.

关键词： Thin films

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Magnetization Plateaus in the Two-dimensional S = 1/2 Heisenberg Model with a 3×3 Checkerboard Structure

arXiv

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arXiv 2024年

作者： Liang, Xuyang Yao, Dao-Xin Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies Center for Neutron Science and Technology School of Physics Sun Yat-Sen University Guangzhou510275 China

We investigate the S=1/2 antiferromagnetic Heisenberg model with a 3×3 checkerboard lattice structure in a longitudinal magnetic field. By using the stochastic series expansion quantum Monte Carlo (SSE-QMC) method, we obtain the properties of the non-plateau XY phase, 1/9, 3/9, 5/9, 7/9 magnetization plateau phases, and fully polarized phase. Then, we determine the precise phase transition critical points belonging to the 3D XY universality class through finite-size scaling. Moreover, we study the longitudinal and transverse dynamic spin structure factors of this model in different phases. For the non-plateau XY phase, the energy spectra present a gap between the low-energy gapless branch and the high-energy part under the competition of magnetic field and interaction. The gapless branch can be described by the spin wave theory in the canted antiferromagnetic phase of the effective "block spin" model. In the magnetization plateau phase, we identify that the excitation arises from localized disturbances within the sublattice, which are capable of spreading in momentum space. This study offers theoretical insights and interpretations for the characteristics of the ground state and the inelastic neutron scattering spectrum in two-dimensional quantum magnetic materials. Specifically, it focuses on materials with a checkerboard unit cell structure and odd-spin configurations under the influence of a longitudinal magnetic field. Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

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Dirac points and Weyl phase in a honeycomb altermagnet

arXiv

引用

arXiv 2024年

作者： Zhang, Meng-Han Guo, Xuan Yao, Dao-Xin Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies Center for Neutron Science and Technology School of Physics Sun Yat-Sen University Guangzhou510275 China

We present a graphene derivative displaying novel topological phenomena without the spin-orbit coupling (SOC) in a collinear altermagnet. By investigating the retarded and advanced Green’s functions, we calculate the spectral density and amplitude of wave function whose exact solutions are analytically obtained. The altermagnetism breaks the intrinsic time-reversal symmetry, guaranteeing the formation of pairs of Weyl points associated with the internal spin structure chiralities. We demonstrate the evolution of Dirac and Weyl crossings, in which spontaneous Hall effect is controlled by the chiral edge modes. Topological phase transitions are characterized by the high Chern numbers preserving the non-intersecting flows of Wannier centers over occupied bands. We illustrate possible experiments to realize topologically altermagnetic responses according to the bulk-boundary correspondence. Copyright © 2024, The Authors. All rights reserved.

关键词： Topology

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