Chinese Physics B
·
2018
·Vol. 27
·期 1
·015202
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IF 1.321
Menghua Zhu,Yaxin Deng,Weiwei Liu,Xin Li
A new hybrid organic-inorganic structure of FTO/TiO2/Se/HTL/Au based selenium solar cell has been fabricated through a low-cost spin-coating process in air. In this process, selenium is completely dissolved in hydrazine, to form a homogeneous precursor solution. After spin-coating the precursor solution on the TiO2 substrates, following by sintering at 200 °C for 5min, a uniform selenium film with crystalline grains is formed. The selenium based solar cell exhibits an efficiency of 1.23% under AM1.5 illumination (100 mW⋅cm−2), short-circuit current density of 8 mA⋅cm−2, open-circuit voltage of 0.55 V, and fill factor of 0.37. Moreover, the device shows a stable ability with almost the same performance after 60 days.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·318
·
IF 3.504
Xin Zhang,Caichi Liu,Gang Ren,Shiyun Li,Chenghao Bi,Qiuyan Hao,Hui Liu
Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH3NH3PbI3nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH3NH3PbI3thin films, reports on the fabrication of CH3NH3PbI3nanowires for optoelectrical application are rather limited. Herein, a two-step spin-coating process has been utilized to fabricate pure-phase and single-crystalline CH3NH3PbI3nanowires on a substrate without mesoporous TiO2or Al2O3. The size and density of CH3NH3PbI3nanowires can be easily controlled by changing the PbI2precursor concentration. The as-prepared CH3NH3PbI3nanowires are utilized to fabricate photodetectors, which exhibit a fairly high switching ratio of ~600, a responsivity of 55 mA/W, and a normalized detectivity of 0.5 × 1011jones under 532 nm light illumination (40 mW/cm2) at a very low bias voltage of 0.1 V. The as-prepared perovskite CH3NH3PbI3nanowires with excellent optoelectronic properties are regarded to be a potential candidate for high-performance photodetector application.Keywords:perovskite;CH3NH3PbI3nanowires;spincoating;photodetectors
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2018
·Vol. 14
·期 28
·5888-5897
·
IF 3.709
Si Yu Zheng,Ye Tian,Xin Ning Zhang,Miao Du,Yihu Song,Zi Liang Wu,Qiang Zheng
Hydrogel films have promising applications in medical dressings, flexible electronics, etc. However, it is challenging to fabricate ultrathin hydrogel films with high toughness and controllable thickness. Here, we report a facile approach to prepare tough physical hydrogel films by spin-coating of a poly(acrylic acid-co-acrylamide) (P(AAc-co-AAm)) solution and subsequent gelation in FeCl3 solution to form carboxyl–Fe3+ coordination complexes. The thickness of the obtained gel films, ranging from several to hundreds of micrometers, was easily tunable by adjusting the spin conditions and polymer concentration. The thus obtained hydrogel films showed excellent mechanical properties, with tensile breaking strengths of 0.6–14.5 MPa, breaking strains of 140–840%, Young's moduli of 0.1–61.7 MPa, and tearing fracture energies of 300–1300 J m−2. Based on this approach, responsive tough hydrogel films can also be prepared by spin-coating of a poly(acrylic acid-co-N-isopropylacrylamide) (P(AAc-co-NIPAm)) solution. The obtained gel films showed a fast response (<60 s) and a large output force (∼0.2 MPa) triggered by a concentrated saline solution, making them an ideal material in the design of chemomechanical devices. Furthermore, a bilayer hydrogel film was fabricated by two-step spin-coating of P(AAc-co-NIPAm) and P(AAc-co-AAm) solutions, which showed reversible bending deformation under external stimuli. This simple yet effective approach should be applicable to other systems to prepare versatile hydrogel films with tunable thickness and promising applications in diverse areas.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
L. Wu,D.J. Yang,C.J. Hu,S. Liu,Q.G. Chen,J.Y. Shi,F. Wu,Y. Xiang
The electrodeposition-based three-state electrochromic device with its electrode surface modified by dip-coated titanium dioxide (TiO 2 ) thin films shows significantly improved cycling stability compared to the device modified with spin-coated ones. The decrement rate of optical transmittance contrast for spin-coated device after 1500 cycles is reduced significantly from 66% to 28% for dip-coated device, indicating ~60% improvement. A comparative study of the structural and morphological features of dip- and spin-coated TiO 2 thin films reveals that the surface uniformity of dip-coated device is much better than that of spin-coated one, leading to an improved overall surface roughness, which is a primary factor of the cycling stability. Although the difference in the surface roughness is marginal for the smooth parts of both the dip- and spin-coated TiO 2 thin films, the improved uniformity of the dip- coated TiO 2 thin film surface is conducive to the quick dissolution of Ag back into electrolyte during the switching between the coloration and bleaching states thanks to the reduced locally residual Ag around or into the rough regions caused by TiO 2 nanoparticles agglomeration.
研究领域:
材料科学
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表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 7
·5814-5819
·
IF 2.324
Diao Chunli,Liu Hanxing,Hao Hua,Cao Minghe,Yao Zhonghua
Mn-doped barium strontium titanate Ba 0.4 Sr 0.6 TiO 3 - x mol%Mn ( x = 0, 1, 3 and 5; BSTM x ) thin films were deposited on Pt/Ti/SiO 2 /Si(100) substrates by spin-coating and annealed at 800 °C. X-ray diffraction patterns revealed that all the thin films were a typical cubic perovskite structure and no impurity peaks were observed. The effect of Mn doping on the ferroelectric properties and energy storage performance of the samples was investigated. The results showed that the recoverable energy storage density U rec and the difference ∆ P ( P max − P r ) between maximum polarization P max and remnant polarization P r firstly increased, then decreased with the increase of Mn doping amount. The optimized energy storage performance was obtained in Pt/BSTM3/Pt thin films: energy storage density of 8.48 J/cm 3 and energy storage efficiency of 42.4% at 1.63 MV/cm, electrical resistivity of 4.19 × 10 10 Ω cm and leakage current density of 7.77 × 10 −6 A/cm 2 at 163 kV/cm. Moreover, the effect of different top electrodes on energy storage performance was studied, which displayed that the energy density of Au/BSTM3/Pt films was higher than that of Pt/BSTM3/Pt films. The results indicated that Mn doping and Au electrodes could be effective ways to improve the energy storage properties of BST thin films.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2019
·Vol. 39
·期 10
·917-925
·
IF 1.072
Danbo Mao,Gang Lv,Guohan Gao,Bin Fan
Optical polyimide (PI) films were prepared by spin-coating from nearly non-volatile dimethylacetamide (DMAc) solutions. The uniformity of film thickness met the requirements of diffraction imaging quality. The results show that the final rotating speed ω , dynamic viscosity η , and initial polymer solid concentration c are the main factors affecting the film thickness T , and an empirical relationship which describes the film thickness as a function of the measured parameters was established to be T ∝ c 3.473 , η 0.586 , ω − 0.811 . Moreover, the viscosity dependence on concentration is system specific. Unlike traditional photoresist, the thickness uniformity of the PI film is determined by both spinning and precure process, which is intensively discussed in the present work. Uniform, 22-μm thick, PI films with transmitted wavefronts peak to valley (PV) ≤ 1/5 λ and root mean square (RMS) ≤ 1/50 λ were prepared under the optimum process: spin speed 900 rpm, initial fluid viscosity 10,500 cp, final spin time 120 s, precure temperature 70°C, spin process repeated 3 times. The results will find use in the production of optical quality membrane for ultra-lightweight optics or other applications.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Aggregate
·
2024
·
IF 13.9
Zhenxin Yang,Jiale Su,Junzhan Wang,Xuanhe Li,Fushun Li,Juntao Hu,Nan Chen,Zhang Tao,Delong Yang,Deng-Ke Wang,Qiang Zhu,Yuhui Liao,Zheng-Hong Lu
Solution coating of organic semiconductors offers great potential for achieving low-cost and high-throughput manufacturing of large-area and flexible electronics. However, the solution processability of semiconducting small molecules for fabricating uniform and reliable thin-film devices poses challenges due to the low viscosities of small-molecule solutions. Here, we report a universal approach employing a primer template (PT) to enhance the spreadability of small-molecule solutions on silicon wafers, enabling the spin-coating fabrication of uniform thin films composed of millimeter-scale grains with complete large-area coverage and well-ordered molecular packing. Using PT, we fabricated organic thin-film transistors (OTFTs) using solutions containing various small molecules such as rubrene and 2-decyl-7-phenyl-[1]benzothieno[3,2-b][1]benzothiophene. The device yield of all fabricated OTFTs is consistently 100% while achieving a high average mobility of 1.62 cm 2 V −1 s −1 with a device-to-device variation of 7.7% measured in ambient air condition. In addition, the utilization of PT resulted in a batch-to-batch variation of 12.5% in device performance over dozens of OTFT devices. The key industrial manufacturing metrics, such as device yield, reproducibility, and performance uniformity of the PT OTFTs, are among the best for devices fabricated using solution spin-coating techniques.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2021
·Vol. 3
·期 1
·647-657
·
IF 0
Jingyuan Zhang,Xiaodong Li,Mu Zhang,Qi Zhu,Xudong Sun
Herein, we present a clean, green and economical method to prepare flexible and ultrathin silver films for electromagnetic interference (EMI) shielding by thermal decomposition of metal–organic decomposition (MOD) inks. The non-particulate ink synthesized by complexing silver oxalate with 1,2-diaminopropane in ethanol solvent can be easily decomposed to pure silver at a quite low temperature in air. The efficient electrical transport network constructed by the interconnected nanoparticles of the silver film results in outstanding electrical properties and shielding performance, with an absorption-dominated mechanism. By curing the ink at 130 °C for 30 min, a more effective network structure for electron transport can be obtained. By the spin coating deposition method, the silver film with only a 200 nm thickness has an ultrahigh conductivity of 8.46 × 106 S m−1 and excellent shielding effectiveness of 51.1 dB at 10.3 GHz in the X band, which is the highest shielding effectiveness of the film with such thin thickness so far. The factors affecting the EMI shielding performance of silver films were elucidated, including the heat treatment process, ink concentration and spin coating times, and the relationship between the microstructure and the properties of the film was established. This work indicates that silver metal–organic decomposition inks will be a favorable choice for the industrial production of EMI shielding applications.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Guoliang Che,Xiying Wang,Can Cui,Beili Pang,Xinjie Wang,Hongzhou Dong,Jianguang Feng,Liyan Yu,Lifeng Dong
In this research, we enhance the stability of all-inorganic CsPbBr 3 perovskite solar cells using a modified multi-step spin-coating technique. By introducing low-concentration CsBr and PbBr 2 in two additional steps, we achieve a PbBr 2 layer with fewer pinholes, improved crystallinity, and a smoother surface. This promotes the formation of a high-quality CsPbBr 3 film with larger grains by incorporating a derivative-phase CsPb 2 Br 5 . This film reduces interface defects, enhances grain growth, and boosts power conversion efficiency from 5.43% to 9.36%. Notably, unencapsulated devices maintain stable performance for over 2400 h in ambient air conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Qiang Xie,Lu Wang,Yangyang Zhu,Qiang Sun,Lijuan Wang
NO 2 gas sensors based on organic field effect transistors (OFETs) with alumina/poly(methyl methacrylate) (Al 2 O 3 /PMMA) bilayer dielectrics were prepared by sol-spin coating method. The sensors with 0.8 mol/L Al 2 O 3 -sol dielectric layer show a high NO 2 response, low baseline drift, stable sensing performance, and fast response/recovery time at room temperature . The sensitivity is over 129%/ppm and the limit of detection is below 1 ppm (134%). The results are comparable to most organic devices. The high sensor properties were attributed to the more ordered films on the dielectric layer and better electrical properties with bilayer dielectric devices than those with single dielectric devices. Compared to OFETs with PMMA single dielectric, the mobility was improved above 23 times, threshold voltage was reduced by 32.47 V, and both on-off current radio and saturation current were improved above an order of magnitude for OFETs with Al 2 O 3 /PMMA bilayer dielectrics at 0.8 mol/L Al 2 O 3 -sol. Moreover, the mechanism of organic film growth and the effect of bilayer dielectrics on sensing properties were analyzed. It is revealed that the highly electrical and NO 2 sensing properties are closely relate. A simple and effective method, the sol-spin coating method, was provided to obtain high performance NO 2 gas sensors based on OFETs.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Hui Yang,Tianrui Chen,Haifeng Wang,Shengchi Bai,Xingzhong Guo
Silver nanowires (AgNWs) with high aspect ratio were rapidly one-pot synthesized by a polyol process in the presence of polyvinylpyrrolidone (PVP) as a stabilizer as well as the anisotropic agent, and the corresponding transparent conductive films were prepared by spin-coating method. The effects of PVP molecular weight and concentration on the morphology and aspect ratio of AgNWs were investigated in detail, and the optoelectrical properties of the transparent conductive films were briefly introduced. The presence of PVP induces the growth of silver directed to form high aspect-ratio nanowires by a high anisotropic mode. Appropriate PVP molecular weight and concentration allows the rapid synthesis of AgNWs with the diameter of about 78.2 nm, the length of 79.52 μm and the aspect ratio as high as 1009.2. The as-prepared AgNWs films possess a transmittance of 81.6% and a sheet resistance of 11.36 Ω/sq. The resultant AgNWs with high aspect ratio can be applied to prepare transparent conductive electrodes.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yan Guo,Leilei Kang,Menghua Zhu,Yan Zhang,Xin Li,Ping Xu
Despite the recently reported efficiency over 20%, the long-term stability of perovskite solar cells (PSCs) under ambient conditions remains a great challenge. For most of the highly efficient PSCs, fabrication processes are usually carried out in glovebox to guarantee their performance and stability. Herein, a new manufacturing strategy is introduced to optimize the device performance under ambient conditions. We skillfully merge both of ultrasonic assisted method and a two-step sequential spin-coating deposition technique to prepare a more compact and pinhole-free ZnO and perovskite films in air. As a result, the ZnO-based PSC with a conventional structure of glass/FTO/ZnO/CH 3 NH 3 PbI 3 /Spiro-OMeTAD/Au demonstrate an efficiency of up to 14.25%. Notably, the efficiency can be maintained at 86.25% of its initial value even though it is exposed to air for 45 days. Most importantly, all processes including fabrication, measurement as well as storage are performed in ambient air. We believe the proposed synergetic strategy can open up a new pathway for boosting the commercial applications of PSCs.
研究领域:
材料科学
·
能源技术
✓ 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）