Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-10
·
IF 23.4
Yu Mubing,Qin Tingxiao,Gao Gang,Zu Kelei,Zhang Dongming,Chen Nan,Wang Dengke,Hua Yong,Zhang Hong,Zhao Yong-Biao,Zhu Jiaqi
Deep-blue perovskite light-emitting diodes (PeLEDs) based on reduced-dimensional perovskites (RDPs) still face a few challenges including severe trap-assisted nonradiative recombination, sluggish exciton transfer, and undesirable bathochromic shift of the electroluminescence spectra, impeding the realization of high-performance PeLEDs. Herein, an in situ chlorination (isCl) post-treatment strategy was employed to regulate phase reconstruction and renovate multiple defects of RDPs, leading to superior carrier cooling of 0.88 ps, extraordinary exciton binding energy of 122.53 meV, and higher photoluminescence quantum yield of 60.9% for RDP films with deep-blue emission at 450 nm. The phase regulation is accomplished via fluorine-derived hydrogen bonds that suppress the formation of small- n phases. Multiple defects, including halide vacancies (shallow-state defects) and lead-chloride antisite defects (deep-state defects), are renovated via C=O coordination and hydroxy-group-derived hydrogen bonds. Consequently, deep-blue PeLEDs with a record maximum external quantum efficiency of 6.17% and stable electroluminescence at 454 nm were demonstrated, representing the best-performing deep-blue PeLEDs.
研究领域:
材料科学
·
光学工程
·
半导体物理
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产品关联
DOI
PubMed
高影响因子
CARBON
·
2025
·
IF 11.6
Jing Li,Junhao Liu,Ning Li,Wenfang Zeng,Minghao Chen,Yawei Xu
Graphene, with its excellent thermal conductivity, is ideal for heat dissipation in small electronic devices. In this study, we propose a method that combines magnetic field-induced assembly and catalytic graphitization to enhance the thermal conductivity of graphene films. Fe₃O₄ was loaded onto graphene oxide (GO) to form magnetic graphene oxide (MGO), which was aligned into an ordered structure under the influence of an external magnetic field. Glucose was then added as a carbon source and thermally reduced at 800 °C to fill defects in the MGO films and reduce phonon scattering. Catalytic graphitization using Fe as a catalyst at 1500 °C converted the amorphous carbon to graphitic carbon, further minimizing phonon scattering. Finally, a second graphitization at 1800 °C was performed to repair structural defects, resulting in a thermal conductivity of 1004.4 W m⁻ 1 K⁻ 1 significantly higher than that of the graphene film obtained by reducing GO under the same conditions (420.2 W m⁻ 1 K⁻ 1 ). This energy-efficient approach offers a promising method for preparing high-thermal-conductivity graphene-based materials for future applications.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Shuaiwei Peng,Tianguan Wang,Guang Huang,Zhuofu Tang,Ziya Shao,Zhiyuan Feng,Bing Lei,Guozhe Meng,Honglei Guo
Organic coatings are commonly used to protect the metals or alloys from corrosion. However, defects such as scratches or natural aging of the coating can induce unexpected diffusion paths for the corrosive media, so the wettability of repairing liquids and the selection of suitable repairing liquids are crucial. In this study, we systematically investigated the capillary impregnation phenomenon by using liquids with various surface tensions and glass capillaries with different surface energies. We utilized this regularity to instruct the defects repairing process. By using an ultra-depth field microscope, scanning electron microscope, and electrochemical analysis, two kinds of repairing liquids, high surface tension liquid (HSTL) and low surface tension liquid (LSTL), were investigated for repairing man-made defects of coatings. Our results showed that the substrate and the surface energy of the liquids significantly influence the infiltration of the repair liquid. By effectively leveraging the relationship between the repair liquid and the substrate, the repair agent can not only establish a uniform and dense repairing layer but also notably enhance the corrosion resistance of the defective coating. This study provides valuable insights into the repairing of coating defects, as well as liquids transportation, microfluidic chip design, and surface modification of microporous materials.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Cai Zhang,Yinyu Li,Jianqing Rao,Xiaogeng Lin,Yang Huang,Yasan He
Covalent organic framework (COF) membranes have shown great potential in dyes’ separation. However, COFs are difficult to form large-area and highly crystalline membranes, therefore there normally exists crystal and stacking defects in COF membranes, impairing their rejection performance. Herein, we discovered the prepared COF-TATP membranes have exceptional high rejection to Congo red (CR) solution. Further study showed the presence of small proportion of CR in other dye solutions also could enhance the rejection to those dyes. 3:100 CR/Brilliant blue R250 (BB) solution could obtain 99.81% rejection to BB. Characterizations indicated CR molecules could well merged into the COF layer and strongly bonded with its N/O groups via plentiful hydrogen bonds. Inspired by the finding, we proposed a strategy of using CR to stitch the defects in COF layer. Specifically, CR was embedded into and then chemically crosslinked with COF-TATP layer by glutaraldehyde to prepare LCR-TATP-NH 2 CS/nylon membranes. The membranes showed obviously enhanced rejection to all dyes tested, typically BB rejection of 99.75%. It also could selectively separate BB/Methyl orange mixed solutions. This study reveals some insights into dyes’ behavior on COF membranes, and provides a simple and feasible strategy for stitching COF membranes’ defects to enhance their performance.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 13
·2110264
·
IF 18.808
Yinghao Wu,Tian-Yu Sun,Tianhao Ge,Wenjie Zhao,Liang-Feng Huang
The structural defects on graphene grown on a metal substrate via chemical vapor deposition can readily stimulate severe galvanic corrosion phenomena. For any defect passivation method that can be technologically promising for superior corrosion-resistant graphene coatings, efficiency and accuracy are two critical but still challenging requirements. In this work, the authors design a rapid processing method (within just 15 min) that can accurately heal various structural defects of different types and sizes on graphene coating, where the hydrophobic 1 H ,1 H ,2 H ,2 H -perfluorooctanethiol (PFOT) molecules are self-assembled onto the defect sites. The surface morphologies, atomic bonding states, and defect-healing mechanism are deeply understood by comprehensive experimental characterizations and first-principles calculations. Both weak physical PFOT-pristine graphene bonding and strong covalent PFOT-defect bonding are two microscopic factors that enhance defect healing efficiency and accuracy. Spatially resolved electronic and electrochemical measurements show that the defect-healing not only effectively suppresses galvanic corrosion phenomena during both short-term and long-term tests, but also well preserves the superior electronic conductivity of pristine graphene. The defect healing strategy proposed here can find its wide potential applications in the fields like electro-industry, coating, and sensors that require the graphene coatings having both superior corrosion resistance and electronic property.
研究领域:
材料科学
·
表面化学
·
防腐蚀技术
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Hanqi Wei,Qihua Yang,Guihua Li,Xuan Liu,Junben Huang,Chujie Wang,Xiaoming Li,Gemei Cai
As one type of recent emerging lead-free perovskites, Cs 2 ZrCl 6 nanocrystals are widely concerned, benefiting from the eminent designability, high X-ray cutoff efficiency, and favorable stability. Improving the luminescence performance of Cs 2 ZrCl 6 nanocrystals has great importance to cater for practical applications. In view of the surface defects frequently formed by the liquid phase method, the particle morphology and surface quality of this material are expected to be regulated if certain intervention is made in the synthesis process. In the work, differing from normal cell lattice modulation based on the ion doping, the grain size and surface morphology of Cs 2 ZrCl 6 nanocrystals are optimized via adding a certain amount of InCl 3 to the synthetic solution. The surface defects are restored to inhibit the defect-induced non-radiative transition, resulting in the improvement of the luminescence properties. Moreover, a flexible Cs 2 ZrCl 6 @polydimethylsiloxane film with excellent heat, water, and bending resistance and a light-emitting diode (LED) device are fabricated, exhibiting excellent application potential for X-ray imaging and blue LED.
研究领域:
材料科学
·
光学工程
·
医学影像
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 45
·22949-22959
·
IF 7.443
Paifeng Luo,Zhaofan Liu,Wei Xia,Chenchen Yuan,Jigui Cheng,Chenxi Xu,Yingwei Lu
Currently, chlorine (Cl)-incorporated perovskite solar cells (PSCs) have triggered a strong interest due to their excellent crystallinity and charge transport property. Herein, we present a facile MaCl-assisted (Ma = CH3NH3) sequential tubular chemical vapor deposition (STCVD) method to fabricate perovskite films, and report for the first time novel Cl-conducted defect repairment and seed crystal-mediated vapor growth behavior. Further studies indicate that Cl has an ultra-strong reaction capacity and special grain refining ability, and these unique features can effectively heal the inherent ditch defects on PbI2 templates and overcome the blocking issue of incomplete conversion in perovskites. With the aid of Cl, the well-defined MaPbI3−xClx small seed crystals are obtained and then grow up into compact, crack-free, and highly uniform MaPbI3 layers with large grain size up to the microscale. Accordingly, the big open-circuit voltage (Voc) exceeding 1.0 V and high efficiency of 13.76% of our STCVD-processed PSCs measured without aperture mask are successfully achieved in this work. Strikingly, our perovskite device without encapsulation still has an efficiency of 4.15% even after exposure to the ambient conditions for 1152 hour. Overall, we propose a viable strategy to realize the controllable preparation of PSCs, and also disclose the exact role of Cl in film morphology evolution during the gas–solid (G–S) growth process.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 35
·2003357
·
IF 11.459
Simin Feng,Junyang Tan,Shilong Zhao,Shuqing Zhang,Usman Khan,Lei Tang,Xiaolong Zou,Junhao Lin,Hui-Ming Cheng,Bilu Liu
Monolayer transition metal dichalcogenides are 2D materials with many potential applications. Chemical vapor deposition (CVD) is a promising method to synthesize these materials. However, CVD-grown materials generally have poorer quality than mechanically exfoliated ones and contain more defects due to the difficulties in controlling precursors' distribution and concentration during growth where solid precursors are used. Here, thiol is proposed to be used as a liquid precursor for CVD growth of high quality and uniform 2D MoS 2 . Atomic-resolved structure characterizations indicate that the concentration of sulfur vacancies in the MoS 2 grown from thiol is the lowest among all reported CVD samples. Low temperature spectroscopic characterization further reveals the ultrahigh optical quality of the grown MoS 2 . Density functional theory simulations indicate that thiol molecules could interact with sulfur vacancies in MoS 2 and repair these defects during the growth of MoS 2 , resulting in high-quality MoS 2 . This work provides a facile and controllable method for the growth of high-quality 2D materials with ultralow sulfur vacancies and high optical quality, which will benefit their optoelectronic applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Weideren Dai,Yule Zhang,Pan Deng,Wei Zhang,Shihao He,Yanzhuo Gou,Xian Xie,Kai Zhang,Jinhua Li,Liangyou Lin,Xianbao Wang
Tin oxide (SnO2) is extensively employed as the electron transport layer (ETL) for perovskite solar cells, but the presence of unsaturated Sn dangling bonds and oxygen vacancy defects at surface hinders effective carrier transport. Herein, we present an effective strategy for constructing a hybrid ETL by doping ZnF2 into the SnO2, effectively addressing the oxygen vacancy defects at both the bulk and interface of SnO2, thus markedly minimizing nonradiative recombination losses. Additionally, the process-induced strong bonding between F and Sn atoms facilitates the establishment of electron transfer pathways, leading to an increased electron cloud density within SnO2 and enhanced electron transfer capability, thus further suppressing charge accumulation at the interface. The hybrid ETL strategy can be adaptable to perovskites with various cations. The MAPbI3 and Cs0.1FA0.9PbI3 perovskite solar cells achieved remarkable PCEs of 21.31% and 24.91%, respectively. Moreover, the hybrid ETL design significantly enhances device stability. After 600 h of ambient storage, the unencapsulated optimized devices retained approximately 90% of their initial efficiency.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 4
·2208841
·
IF 19.924
Jinshuai Zhang,Chun Li,Yin Liang,Jiepeng Song,Qiuyu Shang,Liyun Zhao,Huifeng Tian,Lei Liu,Qing Zhang
Suspended nano/microstructures on semiconductor surfaces that can manage light are attractive for various on-chip and efficiency-enhanced optoelectronics. Hybrid halide perovskites have shown considerable potential for optoelectronic and photonic applications. However, the ionic and soft lattices of perovskites are sensitive to polar solvents, photons, and heat, limiting the post-processing of suspended microstructures. Herein, a solution-processed selective area homoepitaxial growth (SAEG) method is introduced to create well-ordered, suspended microstructure arrays on the surface of MAPbX 3 (X = Br, Cl) single-crystalline thin films. The suspended micro-arrays exhibit single crystalline structures and 11.2 fold photoluminescence enhancement compared to the thin-film substrates. The success of SAEG lies in the making use of perovskite supersaturated HX aqueous solutions that not only repair surface defects induced by lithography but also satisfy homoepitaxial growth kinetics. This study paves a pathway for the fabrication of cost-effective perovskite surface-suspended microstructures for efficiency-enhanced and on-chip optoelectronic devices.
研究领域:
材料科学
·
光学
·
半导体技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 9
·2105142
·
IF 17.521
Guangxing Liang,Mingdong Chen,Muhammad Ishaq,Xinru Li,Rong Tang,Zhuanghao Zheng,Zhenghua Su,Ping Fan,Xianghua Zhang,Shuo Chen
Antimony selenide (Sb 2 Se 3 ) is an ideal photovoltaic candidate profiting from its advantageous material characteristics and superior optoelectronic properties, and has gained considerable development in recent years. However, the further device efficiency breakthrough is largely plagued by severe open-circuit voltage ( V OC ) deficit under the existence of multiple defect states and detrimental recombination loss. In this work, an effective absorber layer growth engineering involved with vapor transport deposition and post-selenization is developed to grow Sb 2 Se 3 thin films. High-quality Sb 2 Se 3 with large compact crystal grains, benign [hk1] growth orientation, stoichiometric chemical composition, and suitable direct bandgap are successfully fulfilled under an optimized post-selenization scenario. Planar Sb 2 Se 3 thin-film solar cells with substrate configuration of Mo/Sb 2 Se 3 /CdS/ITO/Ag are constructed. By contrast, such engineering effort can remarkably mitigate the device V OC deficit, owing to the healed detrimental defects, the suppressed interface and space-charge region recombination, the prolonged carrier lifetime, and the enhanced charge transport. Accordingly, a minimum V OC deficit of 0.647 V contributes to a record V OC of 0.513 V, a champion device with highly interesting efficiency of 7.40% is also comparable to those state-of-the-art Sb 2 Se 3 solar cells, paving a bright avenue to broaden its scope of photovoltaic applications.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiaji Yue,Chao Li,Xingxiang Ji,Yehan Tao,Jie Lu,Yi Cheng,Jian Du,Haisong Wang
Tough and conductive reduction graphene oxide (rGO)-based hydrogels have broad application prospects in various flexible wearable electronics. However, an often ignored phenomenon was that numerous defective regions were inevitably formed within the basal plane of rGO during synthesis process, deteriorating the physical characteristics as well as overall performances of wearable devices. Herein, a facile and effective defect patching engineering was proposed to heal rGO by carbonized metal–organic frameworks (CMOF). The fixed CMOF at defect regions acted as a bridge to allow electrons to pass quickly and enhance tolerance of rGO to loaded mechanical energy. The resultant optimized hydrogel containing defect-patched rGO flakes not only possesses satisfied mechanical properties ( e.g. , tensile strength of 195 kPa) and high electrical conductivity (2.42 S/m), but also exhibits reinforced electric output performances when assembled into triboelectric nanogenerator, supercapacitors and sensor devices. More importantly, the sensor with high sensitivity (gauge factor (GF) of 14.68, short response time of 40 ms) was capable of effective distinguishing complex human activities and accurate detecting the temperature fluctuation of skin within narrow range. As proof-of-concept, the as-synthesized all-in-one flexible intelligent micro-system, composed of power supply, energy storage and sensing units, had proved the great compatibility and feasibility of wearable electronics in detecting and recognizing human expressions, motion and physiological signals. Our findings proposed a reliable defect patching strategy for large-scale production of defect-free 2D carbonaceous materials, boosting the development of high-performance self-powered sensing micro-system in wearable devices.
研究领域:
材料科学
·
纳米技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）