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Direct Growth of Pyramid‐Textured Perovskite Single Crystals: A New Strategy for Enhanced Optoelectronic Performance

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advanced Functional Materials 2020年第34期30卷

作者： Yunxia Zhang Yucheng Liu Zhou Yang Ming Chen Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University (SNNU) Xi’an 710119 China Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China University of the Chinese Academy of Sciences Beijing 100039 China

Even though there have been a few reports of substrate surface texturing of thin film perovskite solar cells to enhance their light trapping, there has been no direct texturing of the perovskite material, let alone perovskite single crystals (SCs). Herein, a method to prepare a pyramid‐structured perovskite CH 3 NH 3 PbX 3 (CH 3 NH 3 + = MA, X = I, Br) SC surface with minimized light reflection and maximized incident light harvesting is reported. Specifically, a hard template is used to directly transfer the pyramidal texture onto the MAPbX 3 SC during its growth. A well‐shaped pyramidal texture is formed on the single‐crystal surface leading to improved light trapping. The textured MAPbBr 3 SC shows good crystallinity, prolonged carrier lifetime, and improved carrier mobility. Furthermore, the photodetector made from the textured SC shows enhanced responsivity of 321 A W −1 and external quantum efficiency of 7191%, about two times higher than that of a control device. This method may be used to directly fabricate desired textures on general single crystal surfaces.

关键词： light trapping perovskite single crystals photodetectors pyramid‐textured MAPbBr3

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Corrigendum to “Preparation and performance of thermal barrier coatings made of BNw-containing modified Nd 2 O 3 -doped yttria-stabilized zirconia” [Ceram. Int. 46 (2019) 500–507]

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Ceramics International 2020年第5期46卷 6999-6999页

作者： Tian Haoliang Wang Changliang Guo Mengqiu Gao Junguo Cui Yongjing Jin Guo Liu Erbao Wang Fuyuan Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Aero Engine Corporation of China Beijing Institute of Aeronautical Materials Beijing 100095 China College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

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Author Correction: Fine cubic Cu2O nanocrystals as highly selective catalyst for propylene epoxidation with molecular oxygen

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Nature communications 2021年第1期12卷 6429页

作者： Wei Xiong Xiang-Kui Gu Zhenhua Zhang Peng Chai Yijing Zang Zongyou Yu Dan Li Hui Zhang Zhi Liu Weixin Huang Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics University of Science and Technology of China 230026 Hefei People's Republic of China. School of Power and Mechanical Engineering Wuhan University 430072 Wuhan People's Republic of China. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces Institute of Physical Chemistry Zhejiang Normal University 321004 Jinhua People's Republic of China. State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 200050 Shanghai People's Republic of China. School of Physical Science and Technology ShanghaiTech University 201210 Shanghai People's Republic of China. Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics University of Science and Technology of China 230026 Hefei People's Republic of China. huangwx@***. Dalian National Laboratory for Clean Energy 116023 Dalian People's Republic of China. huangwx@***.

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Wide Band-Gap Polymer Donors Functionalized with Unconventional Carbamate Side Chains for Polymer Solar Cells

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Angewandte Chemie 2022年第50期134卷

作者： Jie Tang Chentong Liao Yuwei Duan Xiaopeng Xu Min Deng Liyang Yu Ruipeng Li Qiang Peng School of Chemical Engineering College of Chemistry and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 P. R. China Contribution: Conceptualization (equal) Data curation (lead) Formal analysis (lead) Methodology (lead) Contribution: Data curation (equal) Formal analysis (equal) Methodology (equal) Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science & Engineering Shaanxi Normal University Xi'an 710119 P. R. China Contribution: Data curation (supporting) Formal analysis (supporting) Contribution: Conceptualization (supporting) Data curation (supporting) Formal analysis (supporting) Contribution: Data curation (supporting) Formal analysis (supporting) Methodology (supporting) Contribution: Conceptualization (supporting) Formal analysis (supporting) Investigation (supporting) Supervision (supporting) Writing - original draft (lead) Writing - review & editing (supporting) National Synchrotron Light Source II Brookhaven National Lab Suffolk Upton NY 11973 USA Contribution: Conceptualization (lead) Project administration (lead) Supervision (lead) Validation (lead) Writing - review & editing (lead)

Side-chain engineering with heteroatoms is not only effective in tuning frontier molecular orbitals, but also possible for forming secondary bonds which can be utilized to planarize the molecular backbone, hence, improving the photon absorption as well as charge-transport abilities of polymer solar-cell (PSC) materials. Herein, two types of unconventional side chains, namely carboxylate and carbamate, containing various heteroatoms are introduced to the thiophene bridges in high performance benzodithiophene (BDT) based donor polymers to from the novel polymers PTzTz-C and PTzTz-N, respectively. In these polymers, non-covalent O⋅⋅⋅S and N⋅⋅⋅H interactions induce a high tendency to aggregation. In a ternary-blend PSC with PTzTz-N added to the high-performance D18 : BTP-eC9 blend, complimentary absorption and improved thin-film morphology were observed with a top power conversion efficiency of 18.76 %, which is an improvement of almost 5 % over the D18 : BTP-eC9 binary blends.

关键词： Carbamate Conformation Locks Donor Polymer Solar Cells

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Giant Negative Thermal Expansion in Antiferromagnetic CrAs-Based Compounds

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Physical Review Applied 2019年第3期12卷 034027-034027页

作者： Yong Hu Xinqi Zheng Guodong Ma Huiqing Lu Lei Zhang Changsheng Zhang Yuanhua Xia Yiqing Hao Lunhua He Jie Chen Feiran Shen Shouguo Wang Cong Wang Dunhui Wang Youwei Du National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nano Technology Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Physics Center for Condensed Matter and Materials Physics Beihang University Beijing 100083 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 China Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics Institute of Nuclear Physics and Chemistry Mianyang 621999 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Songshan Lake Materials Laboratory Dongguan 523808 China China Spallation Neutron Source Dongguan 523808 China

CrAs is a well-known superconductor, which shows a pronounced volume contraction around a Néel temperature (TN) of 260 K. However, it has not been considered as a negative thermal expansion (NTE) material for industrial applications partially because the temperature window of its phase transition is limited and does not cover room temperature. We prepare some CrAs-based compounds (Cr0.98Ni0.02As, CrAs, and CrAs0.91S0.09) and investigate their linear NTE properties. By chemical modification, a giant NTE can be realized in this system with a broad temperature window of 218 K from 122 to 340 K. Typically, a linear NTE coefficient of −28.3×10−6K−1 in a broad NTE operation-temperature window of 98 K (from 242 to 340 K) is obtained in the CrAs0.91S0.09 compound. In the region between 275 and 315 K around room temperature, the linear NTE coefficient (−51.2×10−6K−1) remains nearly independent of temperature. In addition, the CrAs-based compounds show large thermal and electrical conductivities and their dimensions are insensitive to the external magnetic field. The aforementioned excellent properties suggest that the CrAs-based compounds can serve as an alternative type of NTE materials and have promising applications, especially in the magnetic field environment.

关键词： Magnetic phase transitions Magnetic susceptibility Thermal expansion Alloys Antiferromagnets Metals Smart materials Sample preparation

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Electric-Field Control of Magnetization, Jahn-Teller Distortion, and Orbital Ordering in Ferroelectric Ferromagnets

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Physical Review Letters 2019年第24期122卷 247701-247701页

作者： Lan Chen Changsong Xu Hao Tian Hongjun Xiang Jorge Íñiguez Yurong Yang L. Bellaiche Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing 210093 China Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Materials Research and Technology Department Luxembourg Institute of Science and Technology 5 avenue des Hauts-Fourneaux L-4362 Esch/Alzette Luxembourg Physics and Materials Science Research Unit University of Luxembourg 41 Rue du Brill L-4422 Belvaux Luxembourg

Controlling the direction of the magnetization by an electric field in multiferroics that are both ferroelectric and strongly ferromagnetic will open the door to the design of the next generation of spintronics and memory devices. Using first-principles simulations, we report that the discovery that the PbTiO3/LaTiO3 (PTO/LTO) superlattice possesses such highly desired control, as evidenced by the electric-field-induced rotation of 90° and even a possible full reversal of its magnetization in some cases. Moreover, such systems also exhibit Jahn-Teller distortions, as well as orbital orderings, that are switchable by the electric field, therefore making PTO/LTO of importance for the tuning of electronic properties too. The origin for such striking electric-field controls of magnetization, Jahn-Teller deformations, and orbital orderings resides in the existence of three different types of energetic coupling: one coupling polarization with antiphase and in-phase oxygen octahedral tiltings, a second one coupling polarization with antiphase oxygen octahedra tilting and Jahn-Teller distortions, and finally a biquadratic coupling between antiphase oxygen octahedral tilting and magnetization.

关键词： Density of states Ferroelectricity Ferromagnetism First-principles calculations Magnetism Magnetoelectric effect

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Influence mechanism of Cu on high temperature oxidation behavior of titanium alloys

Influence mechanism of Cu on high temperature oxidation beha...

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Chinese Materials Conference, 2018

作者： Chen, Hang Mi, Guang-Bao Li, Pei-Jie Cao, Chun-Xiao National Center of Novel Materials for International Research Tsinghua University Beijing100084 China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Engineering Research Center of Graphene and Application Beijing100095 China

ISBN: (纸本)9783035713848

The oxidation behavior and mechanism of Ti-Cu alloys (0≤w(Cu)≤20%) in the temperature range of 1000°C~1300°C were studied by thermogravimetric analysis(TGA) combined with SEM, EDS and XRD analysis methods. The results showed that the oxidation rates of Ti-Cu alloys increased sharply when the temperature rised above 1000 °C. The oxidation products had a three-layer structure, from the outside to the inside, which were dense outer oxide layer of TiO2, porous inner oxide layer of low valence oxide of Ti and Cu-enriched layer. With the increase of the temperature, the thicknesses of oxide layers of Ti-Cu alloy increased and the Cu-enriched phase increased gradually and melts. The melting Cu-enriched phase flowed to the oxidation surface along the grain boundaries of the oxide layer. The high temperature oxidation resistance of Ti-Cu alloys declined with the increase of Cu content. The main reason is that more liquid Cu-enriched phase is formed and flows to the oxidation surface along the oxide grain boundaries in the Ti-Cu alloy, and Ti and O ions can diffuse more easily along the liquid Cu-enriched phase, which increases the oxidation rates. © 2019 Trans Tech Publications, Switzerland.

关键词： Binary alloys

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Magnetic order induced polarization anomaly of Raman scattering in 2D magnet CrI3

arXiv

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arXiv 2019年

作者： Zhang, Yujun Wu, Xiaohua Lyu, BingBing Wu, Minghui Zhao, Shixuan Chen, Junyang Jia, Mengyuan Zhang, Chusheng Wang, Le Wang, Xinwei Chen, Yuanzhen Mei, Jiawei Taniguchi, Takashi Watanabe, Kenji Yan, Hugen Liu, Qihang Huang, Li Zhao, Yue Huang, Mingyuan Department of Physics Southern University of Science and Technology Shenzhen518055 China School of Advanced Materials Shenzhen Graduate School Peking University Shenzhen518055 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Advanced Materials Laboratory National Institute for Materials Science Tsukuba Ibaraki305-0044 Japan State Key Laboratory of Applied Surface Physics Department of Physics Fudan University Shanghai200433 China

The recent discovery of 2D magnets has revealed various intriguing phenomena due to the coupling between spin and other degree of freedoms (such as helical photoluminescence, nonreciprocal SHG). Previous research on the spin-phonon coupling effect mainly focuses on the renormalization of phonon frequency. Here we demonstrate that the Raman polarization selection rules of optical phonons can be greatly modified by the magnetic ordering in 2D magnet CrI3. For monolayer samples, the dominant A1g peak shows abnormally high intensity in the cross polarization channel at low temperature, which is forbidden by the selection rule based on the lattice symmetry. While for bilayer, this peak is absent in the cross polarization channel for the layered antiferromagnetic (AFM) state and reappears when it is tuned to the ferromagnetic (FM) state by an external magnetic field. Our findings shed light on exploring the emergent magneto-optical effects in 2D magnets. Copyright © 2019, The Authors. All rights reserved.

关键词： Magnets

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Thermal conduction and tribological properties of carbon/carbon composites densified by xylene pyrolysis using La as a catalyst

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Carbon 2020年 167卷 932-932页

作者： Hai-liang Deng Jin-huang Zheng Zhong-yi Yin Dong-mei Yao Hong Su Xiao-hu Zhang Song-hua Si School of Materials Science and Engineering Anhui University of Technology Maanshan 243002 China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education Anhui University of Technology Maanshan 243002 China Xi'an Aerospace Composite Research Institute Xi'an 710025 China

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Evidences for the random singlet phase in a new honeycomb iridate SrIr2O6−δ

arXiv

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arXiv 2021年

作者： Song, Pengbo Zhu, Kejia Yang, Fan Wei, Yuan Zhang, Lu Yang, Huaixin Sheng, Xian-Lei Qi, Yang Ni, Jiamin Li, Shiyan Li, Yanchun Cao, Guanghan Meng, Zi Yang Li, Wei Shi, Youguo Li, Shiliang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China School of Physics and Materials Science Anhui University Anhui Hefei230601 China School of Physics Beihang University Beijing100191 China Yangtze River Delta Physics Research Center Co. Ltd. Jiangsu Liyang213300 China Center for Field Theory and Particle Physics Department of Physics Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200438 China Multidiscipline Research Center Institute of High Energy Physics Chinese Academy of Science Beijing100049 China Department of Physics Zhejiang University Hangzhou310027 China Zhejiang Province Key Laboratory of Quantum Technology and Devices Interdisciplinary Center for Quantum Information State Key Lab of Silicon Materials Zhejiang University Hangzhou310027 China Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing210093 China Department of Physics HKU-UCAS Joint Institute of Theoretical and Computational Physics University of Hong Kong Pokfulam Road Hong Kong International Research Institute of Multidisciplinary Science Beihang University Being100191 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China

Strong spin-orbital-coupling magnetic systems with the honeycomb structure can provide bond-directional interactions which may result in Kitaev quantum spin liquids and exotic anyonic excitations. However, one of the key ingredients in real materials–disorders–has been much less studied in Kitaev systems. Here we synthesized a trigonal SrIr2O6−δwith δ ≈ 0.25, which consists of two-dimensional honeycomb Ir planes with edge-sharing IrO6 octahedra. First-principles computation and experimental measurements suggest that the electronic system is gapped, and there should be no magnetic moment as the Ir5+ ion has no unpaired electrons. However, significant magnetism has been observed in the material, and it can be attributed to disorders that are most likely from oxygen vacancies. No magnetic order is found down to 0.05 K, and the low-temperature magnetic properties exhibit power-law behaviors in magnetic susceptibility and zero-field specific heat, and a single-parameter scaling of the specific heat under magnetic fields. These results provide strong evidence for the existence of the random singlet phase in SrIr2O6−δ, which offers a different member to the family of spin-orbital entangled iridates and Kitaev materials. Copyright © 2021, The Authors. All rights reserved.

关键词： Iridium compounds

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