JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhenghai Ou,Yongsheng Yi,Ziting Hu,Jiajie Zhu,Wenzhen Wang,Hua Meng,Xiaozheng Zhang,Shengqi Jing,Shanhu Xu,Feng Hong,Jian Huang,Juan Qin,Fei Xu,Run Xu,Yanyan Zhu,Linjun Wang
The optoelectrical properties of semiconductor devices are strongly related to the film morphology. Here, we found that, for CsPbBr 3 thin films prepared by spray coating, the addition of polymethyl methacrylate (PMMA) can completely eliminate voids and greatly reduce the surface roughness of the as-deposited films. As a consequence, the optoelectronic properties of the photodetectors fabricated as a simple vertical structure of Au/CsPbBr 3 (PMMA)/ITO can be improved. With the addition of PMMA, the dark current of the photodetector is reduced at least four times, and the photodetector exhibits a favourable optical response. With the illumination ranging from 400 to 510 nm, the calculated responsivity varies from 3.70 to 5.20 A/W. A good response speed with a rise time of 6.6 ms and a decay time of 11.3 ms can be achieved. Moreover, unlike the inorganic-organic hybrid perovskite detectors, this inorganic perovskite photodetector without encapsulation shows a favourable stability with a decay of 20% after 40 days under ambient air at 20% humidity.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2024
·
IF 10.7
Jing Guo,Ping-An Chen,Shuzhang Yang,Huan Wei,Yu Liu,Jiangnan Xia,Chen Chen,Huajie Chen,Suhao Wang,Wenwu Li,Yuanyuan Hu
Doping plays a crucial role in modulating and enhancing the performance of organic semiconductor (OSC) devices. In this study, the critical role of dopants is underscored in shaping the morphology and structure of OSC films, which in turn profoundly influences their properties. Two dopants, trityl tetrakis(pentafluorophenyl) (TrTPFB) and N , N -dimethylanilinium tetrakis(pentafluorophenyl)borate (DMA-TPFB), are examined for their doping effects on poly(3-hexylthiophene) (P3HT) and PBBT-2T host OSCs. It is found that although TrTPFB exhibits higher doping efficiency, OSCs doped with DMA-TPFB achieve comparable or even enhanced electrical conductivity. Indeed, the electrical conductivity of DMA-TPFB-doped P3HT reaches over 67 S cm −1 , which is a record-high value for mixed-solution-doped P3HT. This can be attributed to DMA-TPFB inducing a higher degree of crystallinity and reduced structural disorder. Moreover, the beneficial impact of DMA-TPFB on the OSC films' morphology and structure results in superior thermoelectric performance in the doped OSCs. These findings highlight the significance of dopant-induced morphological and structural considerations in enhancing the film characteristics of OSCs, opening up a new avenue for optimization of dopant performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 28
·5709-5716
·
IF 0
Hongzhang Liu,Rongcheng Bo,Haifeng Liu,Najun Li,Qingfeng Xu,Hua Li,Jianmei Lu,Lihua Wang
In this paper, two conjugated small molecules (CZ-BT and TPA-BT) were designed and successfully synthesized to investigate the influence of different electron donor moieties on thin-film morphology and their electrical memory device properties. Current–voltage (I–V) curves indicated that both CZ-BT and TPA-BT exhibited stable dynamic random access memory (DRAM) characteristics under appropriate Al evaporation rate condition, but with different threshold voltages, the former lower than the latter due to its better film morphology and closer intermolecular stacking. Furthermore, the performances of the two devices under different Al electrode evaporation rates was also investigated, and the results showed that the CZ-BT-based device still exhibited original DRAM characteristics, whereas the TPA-BT-based device exhibited WORM characteristic when Al electrode evaporation rate was increased to 5 Å s−1. The variation of storage characteristics of TPA-BT could be mainly attributed to its poor film-forming property, and the Al nano-particles would penetrate into the film during the quick evaporation process to form filamentary conduction leading to WORM behavior.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
Nanomaterials
·
2022
·Vol. 12
·期 18
·3121
·
IF 5.719
Zhangwei He,Runnan Yu,Wanrong Song,Yongshuai Gong,Hui Li,Zhan’ao Tan
Bismuth triiodide (BiI3) is a particularly promising absorber material for inorganic thin-film solar cells due to its merits of nontoxicity and low cost. However, one key factor that limits the efficiency of BiI3solar cells is the film morphology, which is strongly correlated with the trap states of the BiI3film. Herein, we report a coordination engineering strategy by using Lewis base dimethyl sulfoxide (DMSO) to induce the formation of a stable BiI3(DMSO)2complex for controlling the morphology of BiI3films. Density functional theory calculations further provide a theoretical framework for understanding the interaction of the BiI3(DMSO)2complex with BiI3. The obtained BiI3(DMSO)2complex could assist the fabrication of highly uniform and pinhole-free films with preferred crystallographic orientation. This high-quality film enables reduced trap densities, a suppressed charge recombination, and improved carrier mobility. In addition, the use of copper(I) thiocyanate (CuSCN) as a hole transport layer improves the charge transport, enabling the realization of solar cells with a record power conversion efficiency of 1.80% and a champion fill factor of 51.5%. Our work deepens the insights into controlling the morphology of BiI3thin films through the coordination engineering strategy and paves the way toward further improving the photovoltaic performances of BiI3solar cells.
研究领域:
材料科学
·
光伏技术
·
理论计算
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yufeng Liu,Jinjie Lu,Zhongli Ji,Cai Linghu,Lang Liu,Cheng Chang,Zhen Liu
Fibrous filters are critical for the removal of tiny oil mists, which is often essential for industrial process and environmental protection. A high pressure drop of the fibrous filter leads to an increase in energy consumption and a tendency to be damaged for fibrous media. The liquid film adsorbed on the surface of fibrous filters owing to the strong capillarity of fine fibers during the oil mist filtration process is one of the main factors resulting in the high pressure drop. Here, we have for the first time reported that a bioinspired fibrous membrane with periodic spindle-knots composited on the oil mist filters can significantly reduce their pressure drop without compromising with filtration efficiency. Coaxial electrospinning was used to prepare the bioinspired fibrous membrane directly on the commercial glass fiber filters. The pressure drop of the composite filter with the bioinspired fibrous membrane was reduced to 2.64 kPa, decreased by 30% and the quality factors were enhanced by 40% for small oil mists and 60% for large oil mists when compared to the control group. Photocuring technology was used to freeze the liquid distribution in filters during the airflow was on and a cluster-like liquid film was observed, suggesting that the change of liquid film morphology is the reason for the reduction in pressure drop. A “migration-instability-holes forming” mechanism was proposed to explain the cluster-like liquid film formation process. Such a novel concept may provide new ideas for fighting against liquid film resistance and the improvement of low energy consumption filters for various applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2012
·
IF 3.567
Mi-mi Tao,Fu Liu,Li-xin Xue
Poly(vinylidene fluoride) (PVDF) membranes were prepared by an ultrasound assisted phase inversion process. The effect of ultrasonic intensity on the evolution of membrane morphology with and without the addition of pore former LiCl during precipitation process was comprehensively investigated. Besides the inter-diffusion between the solvent and nonsolvent, the ultrasonic cavitation was thought to have significant influences on phase inversion and the resultant membrane morphology. The mutual diffusion between water and solvent during the ultrasound assisted phase inversion process was measured. The crystalline structure was detected by wide angle X-ray diffractometer (WAXD). The thermal behavior was studied by differential scanning calorimeter (DSC). The mechanical strength, forward and reverse water flux, rejection to bovine serum albumin (BSA) and pepsin were also investigated. By the ultrasound assisted phase inversion method, ultra-filtration membrane was successfully prepared, which exhibited more preferable morphology, better mechanical property and more favorable permeability without sacrificing the rejection and thermal stability.
研究领域:
材料科学
·
环境工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 38
·2405887
·
IF 27.4
Jin Hu,Ming-Jian Jing,Yu-Ting Huang,Bo-Han Kou,Zheng Li,Yi-Tong Xu,Si-Yuan Yu,Xierong Zeng,Jie Jiang,Peng Lin,Wei-Wei Zhao
Reproducing human visual functions with artificial devices is a long-standing goal of the neuromorphic domain. However, emulating the chemical language communication of the visual system in fluids remains a grand challenge. Here, a “multi-color” hydrogel-based photoelectrochemical retinomorphic synapse is reported with unique chemical-ionic-electrical signaling in an aqueous electrolyte that enables, e.g., color perception and biomolecule-mediated synaptic plasticity. Based on the specific enzyme-catalyzed chromogenic reactions, three multifunctional colored hydrogels are developed, which can not only synergize with the Bi 2 S 3 photogate to recognize the primary colors but also synergize with a given polymeric channel to promote the long-term memory of the system. A synaptic array is further constructed for sensing color images and biomolecule-coded information communication. Taking advantage of the versatile biochemistry, the biochemical-driven reversible photoelectric response of the cone cell is further mimicked. This work introduces rich chemical designs into retinomorphic devices, providing a perspective for replicating the human visual system in fluids.
研究领域:
神经形态工程
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Nasir Ali,Sanam Attique,Sajid Rauf,Xiaoyu Wang,Amir Khesro,Shahid Ali,Muhammad Imran Asghar,Shikuan Yang,Peter D. Lund,Huizhen Wu
Bismuth is considered as one of the most promising candidates to replace Pb in the organo-lead halide perovskite, a classical material for various optoelectronic applications. When utilized in a photovoltaic cell, the performance of the cell drops due to deterioration in the absorber film and the changes in its crystal structures. In this work, a small amount of dodecylammonium chloride, C 12 H 25 NH 3 Cl (DCl) is added into Cs 3 Bi 2 I 9 (CBI), resulting in a pinhole-free high-quality perovskite (PVK) film via a single-step solution processability, also confirmed by FTIR and XPS analyses. Structural, optical, and microscopic analyses showed that the quality, surface features, and crystallinity of the CBI films are significantly improved by adding DCl. The prepared films are successfully demonstrated in a solar cell and exhibited considerably improved photovoltaic (PV) characteristics (V OC by ~47%, J SC by ~33%, FF by 13%, and PCE by 115%) over pure CBI-based devices. Moreover, the PV device retained more than 95% of its initial PCE in the ambient laboratory environment (relative humidity 55±5%). To the best of our knowledge, this is the highest PCE along with extended environmental stability reported for solution processed CBI-based perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yaxin Deng,Xin Li,Rui Wang
Excellent photoelectric properties entail perovskite solar cells with established position prevailing in the new-generation photovoltaic landscape. However, the traditional solution preparation inevitably yields numerous defects, which eventually bloom ion migration and lead to the gradual collapse of perovskite. Here, phthalic acid (PHA) with adjacent carboxylic acid groups (−COOH) is used to passivate defects and regulate the morphology of perovskite films. Based on density functional theory (DFT) calculations, the two adjacent −COOH of PHA construct a dual interaction with the uncoordinated Pb2+ of perovskite, thus significantly enhancing the passivation effect. Furthermore, the double-bonding interaction brought by PHA induces a unique surface-protruding morphology on perovskite films, which may act as a green channel for charge delivery, ultimately increasing the photo-generated current of perovskite solar cells (PSCs) to some extent. Under full-air preparation conditions, the PHA-optimized champion PSCs showed an efficiency of 20.02% with a boosted short-circuit current of 22.80 mA cm–2, showing one of the best performances in all-air preparation until now. Meanwhile, PHA-PSCs exhibited brilliant stability. In short, this work provides some reliable and flexible guidance for the design of small-molecule additives.
研究领域:
材料科学
·
光伏技术
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 25
·4744-4748
·
IF 3.849
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Achieving micro-sized and closely packed grains is an essential requirement for high-performance chalcogenide thin film solar cells. Here, I2–II–IV–VI4 (Cu2MnSn(S,Se)4) (CMTSSe) thin films were successfully deposited by carrying out a simple, degradable solution-based process. The structure, composition, and morphology were characterized by powder X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and scanning electron microscopy (SEM), and the Hall effect was also measured. These characterizations indicated that CMTSSe thin films may find applications in photovoltaic absorbing materials. In addition, different substrates were found to affect the morphology and compactness of the grains of the thin film.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Changting Wei,Jinyong Zhuang,Dongyu Zhang,Wenrui Guo,Dongfang Yang,Zhongzhi Xie,Jianxin Tang,Wenming Su,Haibo Zeng,Zheng Cui
Film morphology has predominant influence on the performance of multilayered organic light-emitting diodes (OLEDs), whereas there is little reported literature from the angle of the molecular level to investigate the impact on film-forming ability and device performance. In this work, four isomeric cross-linkable electron-transport materials constructed with pyridine, 1,2,4-triazole, and vinylbenzyl ether groups were developed for inkjet-printed OLEDs. Their lowest unoccupied molecular orbital (∼3.20 eV) and highest occupied molecular orbital (∼6.50 eV) levels are similar, which are mainly determined by the 1,2,4-triazole groups. The triplet energies of these compounds can be tuned from 2.51 to 2.82 eV by different coupling modes with the core of pyridine, where the 2,6-pyridine-based compound has the highest value of 2.82 eV. Film formation and solubility of the compounds were investigated. It was found that the 2,6-pyridine-based compound outperformed the 2,4-pyridine, 2,5-pyridine, and 3,5-pyridine-based compounds. The spin-coated blue OLEDs based on the four compounds have achieved over 14.0% external quantum efficiencies (EQEs) at the luminance of 100 cd m–2, and a maximum EQE of 12.1% was obtained for the inkjet-printed device with 2,6-pyridine-based compound.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
PubMed
高影响因子
OCEAN ENGINEERING
·
2019
·
IF 2.73
Jiangfan Chang,Xiaoyan He,Xiuqin Bai,Chengqing Yuan
Biofilm formation is crucial for subsequent biofouling. Various factors can affect the biofilm formation. Here we report the influence of hydrodynamic shear force on adhesion morphology and biofilm conformation of Bacillus sp. on stainless steel by a flow cell system. Static, laminar and turbulent conditions were selected for this study. The applicability of this flow cell was evaluated by computational fluid dynamics (CFD). Stable wall shear stresses were successfully obtained. The results showed that the spatial distribution of bacteria changed from single-cell to cluster under the effect of shear force and the higher shear force created smoother and denser clusters. The different morphology of clusters under different flow conditions was mainly due to the increased nutrient supply to the clusters with the increase of flow velocity. Under the effect of shear force, Bacillus sp. could change the shape and increase the production of extracellular polymeric substance which could reduce the effect of shear force and enhance the connection and adhesion, respectively. Under low shear force, biofilm preferred to form irregular and complicated structure which could lead to the formation of tower like biofilm and inhibit the external mass transfer . The results could shed some light on biofilm control strategies.
研究领域:
微生物学
·
环境工程
✓ 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）