Ying Xiang

Guangdong University of Technology

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Hai‐Hu Wen

Nanjing University

Yikun Liu

Nanchang University

NÉ

Nándor Éber

Wigner Research Centre for Physics

Ming-Ya Xu

Guangdong University of Technology

ÁB

Ágnes Buka

Wigner Research Centre for Physics

Everett Wang

Beijing Institute of Nanoenergy and Nanosystems

Huan Yang

Nanjing University

Hongzhen Jing

Guangdong University of Technology

Péter Salamon

Wigner Research Centre for Physics

Santanu Kumar Pal

Indian Institute of Science Education and Research Mohali

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Sun Yat-sen University

Nanjing University

Guangdong University of Technology

Collaborative Innovation Center of Advanced Microstructures

Shanghai Jiao Tong University

University of Manchester

Shandong University

Zhejiang University

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Phase manipulated multi-beam holographic lithography for tunable optical lattices

Optics Express (2007)

Xiangsheng Xie M Li Jin Guo Bing Liang Z. X. Wang

We present principle and technique to actively stabilize and control the phase differences between multi-laser beams that produce stable and adjustable intensity patterns. This technique is based on a novel optical set-up and on a closed loop control over the phase difference between each pair of the input laser fields. Tunable optical lattices are demonstrated by exciting FeTPPCl-doped liquid crystals with the variable intensity patterns.

Intensity

10.1364/oe.15.007032

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Citations (22)

Architecture of poly(o-phenylenediamine)–Ag nanoparticle composites for a hydrogen peroxide sensor

Electrochimica Acta (2011)

Li Wang Haozhi Zhu Yonghai Song Li Liu Zhifang He

Amperometry

10.1016/j.electacta.2011.11.045

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Citations (44)

Continuously adjustable period optical grating based on flexoelectric effect of a bent-core nematic liquid crystal in planar cells

Optics Express (2018)

Rui Yuan Wenjiang Ye Hongyu Xing Zhenjie Li Tingting Sun

The structures of flexodomains, which are similar to optical gratings and can be controlled by the amplitude of applied voltage and temperature, were verified through polarizing microscopy and light diffraction techniques. The properties of the optical grating induced by a bent-core nematic liquid crystal in planar cells with varied cell gaps and pretilt angles were studied. The period of optical grating decreases with the increase in the amplitude of the applied voltage and pretilt angle. In addition, the period increases with the increase in cell gap and temperature. The period of optical grating has a linear relationship with temperature. The continuously adjustable period has the potential to become an important and extended application of optical grating.

Diffraction efficiency

10.1364/oe.26.004288

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Citations (10)

8.78% Efficient All‐Polymer Solar Cells Enabled by Polymer Acceptors Based on a B←N Embedded Electron‐Deficient Unit

Advanced Materials (2019)

Yongchun Li Huifeng Meng Tao Liu Yiqun Xiao Zhong-Hai Tang

In the field of all-polymer solar cells (all-PSCs), all efficient polymer acceptors that exhibit efficiencies beyond 8% are based on either imide or dicyanoethylene. To boost the development of this promising solar cell type, creating novel electron-deficient units to build high-performance polymer acceptors is critical. A novel electron-deficient unit containing B←N bonds, namely, BNIDT, is synthesized. Systematic investigation of BNIDT reveals desirable properties including good coplanarity, favorable single-crystal structure, narrowed bandgap and downshifted energy levels, and extended absorption profiles. By copolymerizing BNIDT with thiophene and 3,4-difluorothiophene, two novel conjugated polymers named BN-T and BN-2fT are developed, respectively. It is shown that these polymers possess wide absorption spectra covering 350-800 nm, low-lying energy levels, and ambipolar film-transistor characteristics. Using PBDB-T as the donor and BN-2fT as the acceptor, all-PSCs afford an encouraging efficiency of 8.78%, which is the highest for all-PSCs excluding the devices based on imide and dicyanoethylene-type acceptors. Considering that the structure of BNIDT is totally different from these classical units, this work opens up a new class of electron-deficient unit for constructing efficient polymer acceptors that can realize efficiencies beyond 8% for the first time.

Acceptor

Ambipolar diffusion

Electron acceptor

Imide

10.1002/adma.201904585

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Citations (126)

Synthesis of Conjugated Polymers Containing B←N Bonds with Strong Electron Affinity and Extended Absorption

Polymers (2019)

Bo Pang Zhong-Hai Tang Yongchun Li Huifeng Meng Ying Xiang

The B←N is isoelectronic to the C–C, with the former having stronger dipole moment and higher electron affinity. Replacing the C–C bonds in conjugated polymers with B←N bonds is an effective pathway toward novel polymers with strong electron affinity and adjustable optoelectronic properties. In this work, we synthesize a conjugated copolymer, namely, BNIDT-DPP, based on a B←N embedded unit, BNIDT, and a typical electron-deficient unit, diketopyrrolopyrrole (DPP). For comparison, the C–C counterpart, i.e., IDT-DPP, is also synthesized. In contrast to IDT-DPP, the B←N embedded polymer BNIDT-DPP shows an extended absorption edge (836 versus 978 nm), narrowed optical bandgap (1.48 versus 1.27 eV), and higher electron affinity (3.54 versus 3.74 eV). The Gaussian simulations reveal that the B←N embedded polymer BNIDT-DPP is more electron-deficient in contrast to IDT-DPP, supporting the decreased bandgap and energy levels of BNIDT-DPP. Organic thin-film transistor (OTFT) tests indicate a well-defined p-type characteristic for both IDT-DPP and BNIDT-DPP. The hole mobilities of IDT-DPP and BNIDT-DPP tested by OTFTs are 0.059 and 0.035 cm2/V·s, respectively. The preliminary fabrication of all-polymer solar cells based on BNIDT-DPP and PBDB-T affords a PCE of 0.12%. This work develops a novel B←N embedded polymer with strong electron affinity and extended absorption, which is potentially useful for electronic device application.

10.3390/polym11101630

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Citations (11)

Optical-field-induced Freedericksz transition of a nematic liquid crystal doped with diazophenyl

Chinese Science Bulletin (2001)

Jian Wang Yu Li Yonglie Chen Zhaoxi Liang Ying Xiang

Fréedericksz transition

10.1007/bf03182825

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Citations (1)

An intermolecular coupling between guest and host in the doped liquid crystal system

Journal of Applied Physics (2007)

Ying Xiang Tao Li Ziyang Lin Jie Lin

The magnetic-field-Induced reorientation of a planar alignment nematic liquid crystal (5CB) doped with different paramagnetic dopants has been studied in this paper. It was observed that compared with the pure 5CB, 5CB doped with five-coordinated [Cu(o-xyTQ)H2O](NO3)2 dramatically decreased the critical magnetic field strength for the reorientation, while 5CB doped with six-coordinated [Cu(DETQ)](ClO4)2 revealed no such effect. Although the two paramagnetic dopants possess the same magnetic property, they have different intermolecular couplings with host 5CB, which produce the different results. This phenomenon is very useful to study the magneto-optical component of liquid crystal.

10.1063/1.2433997

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Citations (3)

B←N Coordination: From Chemistry to Organic Photovoltaic Materials

Advanced Energy and Sustainability Research (2021)

Jianhua Huang Xiao-Ling Wang Ying Xiang Liang Guo Guohua Chen

Coordination between boron Lewis acid and nitrogen Lewis base (B←N) is a classically chemical issue that has been known for several decades. Recently, this B←N chemistry developed into a new stage toward electronic materials, e.g., adjusting optoelectronic properties of N‐based conjugated molecules via adding B Lewis acids, synthesizing B←N‐bridged conjugated units, and further constructing B←N‐embedded organic photovoltaic (OPV) materials. Herein, these progresses are systematically summarized starting from certain chemical issues concerning B←N coordination, e.g., Lewis acidity of typical B Lewis acids and their interactions with N‐contained conjugated molecules. Then, some fused and ladder‐type B←N‐bridged units are reviewed in terms of the relationship between molecular structures and optoelectronic properties. Finally, the recently flourished B←N‐embedded OPV materials are summarized. The prospect of OPV materials concerning B←N coordination is also proposed, hoping to attract more attention to this filed and motivate its rolling rapidly.

Coordination complex

10.1002/aesr.202100016

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Citations (36)

Nematic electronic state and twofold symmetry of superconductivity in the topological kagome metal CsV$_3$Sb$_5$

arXiv (Cornell University) (2021)

Ying Xiang Qing Li Yongkai Li Wei Xie Huan Yang

In transition metal compounds, due to the interactions among the charge, spin, lattice and orbital freedoms, many intertwined orders exist with close energies. One of the commonly observed states is the so-called nematic electron state, which breaks the in-plane rotational symmetry. This nematic state appears in cuprates, iron based superconductor, ultra-clean quantum Hall systems, and Sr$_3$Ru$_2$O$_7$, etc. Nematicity may coexist, affect, cooperate or compete with other orders. Here we show the anisotropic in-plane electronic state and superconductivity in a recently discovered kagome metal CsV$_3$Sb$_5$ by measuring $c$-axis resistivity with the in-plane rotation of magnetic field. We observe a twofold symmetry of superconductivity in the superconducting state and a unique in-plane nematic electronic state above $T_c$. Interestingly these two orders are orthogonal to each other in terms of the field direction of the minimum resistivity. Our results shed new light in understanding non-trivial physical properties of CsV$_3$Sb$_5$.

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Ultimate charge transport regimes in doping-controlled graphene laminates: phonon-assisted processes revealed by the linear magnetoresistance

arXiv (Cornell University) (2024)

Mohsen Moazzami Gudarzi Sergey Slizovskiy Boyang Mao Endre Tóvári Gergő Pintér

Understanding and controlling the electrical properties of solution-processed 2D materials is key to further printed electronics progress. Here we demonstrate that the thermolysis of the aromatic intercalants utilized in nanosheet exfoliation for graphene laminates opens the route to achieving high intrinsic mobility and simultaneously controlling doping type ($n$- and $p$-) and concentration over a wide range. We establish that the intra-flake mobility is high by observing a linear magnetoresistance of such solution-processed graphene laminates and using it to devolve the inter-flake tunneling and intra-layer magnetotransport. Consequently, we determine the temperature dependences of the inter- and intra-layer characteristics, which both appear to be dominated by phonon-assisted processes at temperature $T>$20 Kelvin. In particular, we identify the efficiency of phonon-assisted tunneling as the main limiting factor for electrical conductivity in graphene laminates at room temperature. We also demonstrate a thermoelectric sensitivity of around 50 ${\mu}$V K$^{-1}$ in a solution-processed metal-free graphene-based thermocouple.

10.1021/acsnano.4c05512

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