ADVANCED MATERIALS
·
2021
·Vol. 33
·期 17
·2008456
·
IF 30.849
Hongtao Liu,Yunzhou Xue
Layered iron chalcogenides (FeX, X = S, Se, Te) provide excellent platforms to study intertwined phase transitions, superconductivity, and magnetism. However, layered iron dichalcogenides (FeX 2 , X = S, Se, Te) are rarely reported and their intrinsic properties are still unknown. Here, phase-pure layered iron diselenide (FeSe 2 ) nanocrystals are epitaxially grown on mica by the sublimed-salt-assisted chemical vapor deposition method at atmospheric pressure. The layered atomic structure of FeSe 2 is confirmed by X-ray diffraction and atomic-resolution scanning transmission electron microscopy. Electrical transport shows that the layered FeSe 2 is a metal with high conductivity and a phase transition at ≈11 K. The phase transition manifests itself as a kink in the temperature-dependent resistivity, as well as anomalous magnetoresistance (MR) appearing around the phase-transition temperature. The MR changes from negative to positive, accompanied by large hysteresis near the phase-transition temperature upon cooling. The negative MR and hysteresis might originate from magnetic field suppression scattering of spin fluctuations and competition of magnetic interactions induced by the phase transition, respectively. Layered iron dichalcogenide will be potential candidate to explore novel quantum phenomena and other applications.
研究领域:
凝聚态物理
·
材料科学
·
纳米科技
·
固体化学
·
低维材料
✓ 已验证
DOI
高影响因子
Nature Nanotechnology
·
2021
·Vol. 16
·期 11
·1201-1207
·
IF 39.213
Li Taotao,Guo Wei,Ma Liang,Li Weisheng,Yu Zhihao,Han Zhen,Gao Si,Liu Lei,Fan Dongxu,Wang Zixuan,Yang Yang,Lin Weiyi,Luo Zhongzhong,Chen Xiaoqing,Dai Ningxuan,Tu Xuecou,Pan Danfeng,Yao Yagang,Wang Peng,Nie Yuefeng,Wang Jinlan,Shi Yi,Wang Xinran
Two-dimensional (2D) semiconductors, in particular transition metal dichalcogenides (TMDCs), have attracted great interest in extending Moore’s law beyond silicon 1 , 2 , 3 . However, despite extensive efforts 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , the growth of wafer-scale TMDC single crystals on scalable and industry-compatible substrates has not been well demonstrated. Here we demonstrate the epitaxial growth of 2 inch (~50 mm) monolayer molybdenum disulfide (MoS 2 ) single crystals on a C-plane sapphire. We designed the miscut orientation towards the A axis (C/A) of sapphire, which is perpendicular to the standard substrates. Although the change of miscut orientation does not affect the epitaxial relationship, the resulting step edges break the degeneracy of nucleation energy for the antiparallel MoS 2 domains and lead to more than a 99% unidirectional alignment. A set of microscopies, spectroscopies and electrical measurements consistently showed that the MoS 2 is single crystalline and has an excellent wafer-scale uniformity. We fabricated field-effect transistors and obtained a mobility of 102.6 cm 2 V −1 s −1 and a saturation current of 450 μA μm –1 , which are among the highest for monolayer MoS 2 . A statistical analysis of 160 field-effect transistors over a centimetre scale showed a >94% device yield and a 15% variation in mobility. We further demonstrated the single-crystalline MoSe 2 on C/A sapphire. Our method offers a general and scalable route to produce TMDC single crystals towards future electronics.
研究领域:
材料科学
·
半导体物理
·
纳米技术
·
电子学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jianhong Zhang,Junjie Yan,Zhikang Ao,Wei Li,Wei Wang,Yinong Lyu,Huifang Ma
The heterostructure moiré superlattice plays a crucial role in modulating electronic and optical properties through the formation of periodic potential patterns. However, the synthesis of ultrathin 2D heterostructures remains a significant challenge. In this work, ultrathin 2D CoSe/WSe 2 heterostructures were grown via a two-step vapor deposition route. The thickness of nonlayered hexagonal CoSe nanosheets was reduced to 1.7 nm through growth on a 0.79 nm thick WSe 2 nanosheet. Raman spectroscopy analyses indicate the formation of high-quality 2D CoSe/WSe 2 heterostructures. Selected area electron diffraction studies conclusively validate the high-quality single-crystal nature of CoSe and WSe 2 nanosheets within the resultant heterostructures. Scanning transmission electron microscopy studies show that the formed heterostructure exhibits a well-defined moiré superlattice with a periodicity of ∼ 3.96 nm. Additionally, the device based on CoSe/WSe 2 heterostructures with CoSe contacts demonstrates relatively higher on-state current and field-effect mobility compared to the WSe 2 device with Cr/Au contacts. The developed synthesis method for ultrathin CoSe/WSe 2 heterostructures provides a material platform for investigating their diverse properties.
研究领域:
材料科学
·
纳米技术
·
固体物理
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Haiyang Wu,Yang Li,Langyuan Wu,Zhiwei Li,Yimin Xing,Dewei Xiao,Zengjie Fan,Xiaogang Zhang
Zinc-ion batteries (ZIBs) have faced persistent challenges related to dendrite growth and the hydrogen evolution reaction (HER). Herein, a metal-organic framework (MOF) polycrystalline membrane is introduced into the realm of ZIB research, motivated by the remarkable separation capabilities exhibited by MOF membranes. A MOF polycrystalline membrane is constructed on the Zn anode through liquid-phase epitaxial growth at room temperature. Aberration-corrected scanning transmission electron microscopy (AC-STEM) analysis unequivocally verifies the ingress of Zn 2+ into the MOF cavities, subsequently leading to the reconstitution of the solvation sheath. Profiting from the close contact between the membrane and the Zn anode, the Zn 2+ are reduced to Zn 0 directly in the cavities of the MOF after entering. This behavior effectively regulates the deposition trajectory of Zn 2+ and eliminates the potential for secondary solvation. Leveraging the efficient separation and ion-confinement capabilities of the MOF, the Zn anode incorporating the metal-azolate framework-4 (MAF-4) membrane demonstrates notable inhibition of the HER and suppression of dendrite formation.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Guoqiang Zhao,Xiaoyu Tao,Tongsen Guo,Liangjie Fu,Huaming Yang
Solution-phase epitaxy is a versatile method to synthesize functional nanomaterials with customized properties, where supports play a central role as they not only serve as nucleation templates but also greatly affect the local electronic structures. However, developing functional supports remains a great challenge. Herein, inspired by the commonly observed epitaxy of minerals in the natural environment, we report using calcination-modified kaolinite as the support for the epitaxial growth of hexagonal CoO nanoparticles (h-CoO NPs), which enables over 40 times higher mass-specific activity toward H2O2 electrochemical activation than the counterpart without the support. High-resolution electron microscopy, magic-angle spinning nuclear magnetic resonance, and X-ray absorption fine structure results prove that the Al sites in kaolinite play a crucial role in the formation of h-CoO NPs. Moreover, the five-coordinate Al (AlV) sites produced by the dehydration of kaolinite are indispensable for forming the epitaxial interface. Theoretical calculations reveal that the local electron densities around AlV sites are lower than those of general six-coordinate Al sites, which render AlV sites with strong adsorption capability that facilitates the nucleation of h-CoO NPs. Also, the AlV sites induce the electron transfer from h-CoO to the kaolinite support that results in the upshift of the Co 3d band center and hence improve the H2O2 activation kinetics. Our results demonstrate the superiority of nanoclay as functional supports and could offer a more benign strategy to the solution-phase epitaxy production of functional nanomaterials for diverse applications.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APL Materials
·
2022
·Vol. 10
·期 4
·
IF 6.635
Wang Mengrou,Xu Yubing,Wang Xin,Li Yuwei,Zhao Jingda,Pan Yuzhu,Chen Jing,Li Qing,Zhao Zhiwei,Wu Jun,Lei Wei
All-inorganic halide semiconductors with perovskite or perovskite-like structure have aroused a widespread concern recently for its environmental friendliness and stabilities while possessing excellent optoelectronic properties. Double perovskite Cs 2 AgBiBr 6 single crystal (SC) is one of the most representative materials in the latest research area. To further improve the device response range and decrease its dark current density effectively, functional layers based on the solution-processed epitaxial method are normally fabricated as heterojunctions. Herein, a novel idea of a broadband heterojunction MAPbI 3 (MA = CH 3 NH 3 )/Cs 2 AgBiBr 6 is proposed in this work to achieve this goal. A MAPbI 3 layer is fabricated on Cs 2 AgBiBr 6 SC substrates through immersing Cs 2 AgBiBr 6 SC into MAPbI 3 solution at a MAPbI 3 crystallization temperature. Ultimately, this heterojunction device expands the absorption limit from 618 to 838 nm, makes responsivity range redshift from 629 to 860 nm, and achieves a responsivity of 16.8 mA W −1 while the detectivity of 1.33 × 10 11 Jones under 622 nm 0.55 mW cm −2 illumination at −20 V bias, maintaining excellent optoelectronic properties.
研究领域:
材料科学
·
光电材料
·
半导体物理
✓ 已验证
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2024
·
IF 2.5
Yang Yu,Zhonglong Zhang,Qiuchun Lu,Jiaqi Tang,Wenqiang Wu,Xun Han
Copper-based halides, a type of perovskite derivative, inherit their excellent optoelectronic properties and solution processability and also have the advantages of being nontoxic and stable. Despite the tremendous achievements of microfabrication in conventional halide perovskites, reports on copper-based halide array devices are rare due to their difficult high-quality crystallization. Here, by introducing single-crystal thin films grown by space confinement method as substrates, reliable photolithography based on their single crystals is successfully achieved and controllable homoepitaxial single-crystal arrays is demonstrated. By adjusting the substrate, angle, and growth time, the orientation, arrangement, and size of arrays could be controlled. Temperature and time are used to regulate the growth stage to obtain clean and appropriately sized arrays. ITO/Cs 3 Cu 2 I 5 /ITO neuromorphic device based on homoepitaxial arrays is developed. The variation of synaptic plasticity could be controlled by the number and frequency of light pulses. The device successfully simulated the process of “learning, forgetting, and relearning” in the human brain, demonstrating the potential of application in sensing-storage-computing-integrated devices.
研究领域:
材料科学
·
光电子学
·
神经形态计算
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·
IF 9.9
Wu Zenghui,Shifan Chen,Wu Zitong,Liu Yi,Shao Wei,Liang Xinchao,Hou Chuang,Tai Guoan
In-situ integration of multiple materials with well-defined interfaces as heterostructures is of great interest due to their unique properties and potential for new device functionality. Because of its polymorphism and diverse bonding geometries, borophene is a promising candidate for two-dimensional heterostructures, but suitable synthesis conditions have limited its potential applications. Toward this end, we demonstrate the vertical borophene and graphene heterostructures which form by epitaxial growth of borophene onto multilayer graphene on Cu substrates via chemical vapor deposition, where hydrogen and NaBH 4 are respectively used as the carrier gas and the boron source. The lattice structure of the as-synthesized borophene well coincides with the predicted α′-boron sheet. The borophene-based photodetector shows an excellent broadband photoresponse from the ultraviolet (255 nm) to the infrared (940 nm) wavelengths, with enhanced responsivity compared to pristine borophene or graphene photodetectors. This work informs emerging efforts to integrate borophene into nanoelectronic applications for both fundamental investigations and technological applications.
研究领域:
材料科学
·
纳米电子学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2021
·
IF 3.515
Xu Yubing,Wang Xin,Zhao Jingda,Pan Yuzhu,Li Yuwei,Elemike Elias Emeka,Li Qing,Zhang Xiaobing,Chen Jing,Zhao Zhiwei,Akram Javed,Bae Byung Seong,Bin Suhaidi,Lei Wei
Recent years, organic-inorganic hybrid perovskites (OIHPs) have been widely used in applications, such as solar cells, lasers, light-emission diodes, and photodetectors due to their outstanding optoelectronic properties. Nowadays photodetectors based on perovskite films (PFs) suffer from surface and interface traps, which result from low crystalline quality of perovskite films and lattice mismatch between perovskite films and substrates. Herein, we fabricate MAPbI3 -(MA = CH3NH3) single-crystal films (SCFs) on MAPbBr3 single crystal substrates in MAPbI3 precursor solution during crystallization process via solution-processed epitaxy. Benefit from the good lattice matching, epitaxial MAPbI3 SCFs with high crystallinity and smooth morphology are of comparable quality to MAPbI3 PSCs and are of better quality than MAPbI3 polycrystalline films. Here we report that epitaxial MAPbI3 SCFs have a low trap density of 5.64×1011 cm–3 and a long carrier lifetime of 11.86 μs. In this work, photodetector based on epitaxial MAPbI3 single-crystal film (SCF) exhibits an excellent stability of a long-term stable response after 120 days, a fast response time of 2.21 μs, a high responsivity of 1.2 A W–1 and a high detectivity of 3.07 ×1012 jones.
研究领域:
材料科学
·
光电技术
·
半导体物理
✓ 已验证
DOI
高影响因子
Nanoscale Advances
·
2022
·Vol. 5
·期 3
·693-700
·
IF 5.598
Hailin Yang,An Wu,Huaxin Yi,Weiwei Cao,Jiandong Yao,Guowei Yang,Yi-Chao Zou
Two-dimensional (2D) magnetic materials are of wide research interest owing to their promising applications in spintronic devices. Among them, chromium chalcogenide compounds are some of the limited available systems that present both high stability in air and high Curie temperatures. Epitaxial growth techniques based on chemical vapour deposition (CVD) have been demonstrated to be a robust method for growing 2D non-layered chromium chalcogenides. However, the growth mechanism is not well-understood. Here, we demonstrate the epitaxial growth of Cr3Te4 nanoplates with high quality on mica. Atomic-resolution scanning transmission electron microscopy (STEM) imaging reveals that the epitaxial growth is based on nanosized chromium oxide seed particles at the interface of Cr3Te4 and mica. The chromium oxide nanoparticle exhibits a coherent interface with both mica and Cr3Te4 with a lattice mismatch within 3%, suggesting that, as a buffer layer, chromium oxide can release the interfacial strain, and induce the growth of Cr3Te4 although there is a distinct oxygen-content difference between mica and Cr3Te4. This work provides an experimental understanding behind the epitaxial growth of 2D magnetic materials at the atomic scale and facilitates the improvement of their growth procedures for devices with high crystalline quality.
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
表面科学
·
电子显微学
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·391
·
IF 38.5
Lu Hui,Yu Yang,Wu Wenqiang,He Zeping,Hu Kaiyu,Yang Wenqiang,Han Xun,Pan Caofeng
Perovskite single-crystal heterojunction arrays exhibit significant application potential in advanced optoelectronics, however, achieving comprehensive control over crystallographic and spatial properties of the array remains challenging. Here, we report a selective epitaxial growth strategy for fabricating single-crystal MAPbCl3/MAPbBr3 and MAPbBr3/MAPbI3 heterojunction arrays. This method employs patterned polymer templates to define the pixel dimension and arrangement, while the underlying single-crystal substrate guides the crystal orientation of the heterojunction array, enabling precise control over the pixel size, pixel arrangement angle and crystal plane. The self-powered photodetector arrays were fabricated based on these heterojunctions, showing a specific detectivity of 6.0 × 1011 Jones, a weak-light detection limit of 9 nW cm−2 and long-term operation stability under zero bias. Furthermore, the light pattern with different illumination intensities could be clearly imaged by the device array in the self-powered mode. This work establishes a robust method of fabricating the single-crystal heterojunction arrays for advanced optoelectronic applications.
✓ 已验证
DOI
PubMed
高影响因子
Joule
·
2026
·
IF 37.1
Bowen Jin,Yifei Kang,Hanming Li,Xiaonan Shen,Yecheng Ju,Hong Tian,Yanxiang Li,Yilong Song,Qingfeng Dong
The construction of high-quality crystalline junctions is pivotal for unlocking the full potential of perovskite optoelectronics, yet it remains challenging, especially via solution processing in ambient air. Here, we demonstrate a rapid epitaxial growth strategy for fabricating orientation-controlled perovskite homojunctions using a solvent-mediated thermal-shock process. This air-based epitaxy leverages the synergy between thermal-shock-induced flash crystallization and the inverse temperature solubility of 2-methoxyethanol, which maintains interfacial stability while enabling directional growth, thus combining solution-processing simplicity with epitaxial precision. The resultant 3D/3D perovskite homojunction exhibits a highly consistent (001) orientation (Hermans’ orientation factor of −0.3643) and a low trap-state density. Consequently, the corresponding homojunction perovskite solar cell (PSC) achieves a remarkable power conversion efficiency of 25.58% with outstanding operational stability, maintaining 93%, 97%, and 94% of its initial efficiency under International Summit on Organic Photovoltaic Stability (ISOS)-D-1, ISOS-L-1I, and ISOS-D-2I protocols, respectively.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）