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Fully Printed High‑Performance n‑Type Metal Oxide Thin‑Film Transistors Utilizing coffee‑ring effect

Nano-Micro Letters 2021年第11期13卷 68-78页

作者： Kun Liang Dingwei Li Huihui Ren Momo Zhao Hong Wang Mengfan Ding Guangwei Xu Xiaolong Zhao Shibing Long Siyuan Zhu Pei Sheng Wenbin Li Xiao Lin Bowen Zhu Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Zhejiang University Hangzhou 310027China Key Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXian 710071China School of Microelectronics University of Science and Technology of ChinaHefei 230026China Instrumentation and Service Center for Physical Sciences Westlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China School of Science Westlake UniversityHangzhou 310024China

Metal oxide thin-films transistors(TFTs)produced from solution-based printing techniques can lead to large-area electronics with low ***,the performance of current printed devices is inferior to those from vacuum-based methods due to poor film uniformity induced by the“coffeering”***,we report a novel approach to print highperformance indium tin oxide(ITO)-based TFTs and logic inverters by taking advantage of such notorious *** has high electrical conductivity and is generally used as an electrode ***,by reducing the film thickness down to nanometers scale,the carrier concentration of ITO can be effectively reduced to enable new applications as active channels in *** ultrathin(~10-nm-thick)ITO film in the center of the coffee-ring worked as semiconducting channels,while the thick ITO ridges(>18-nm-thick)served as the contact *** fully inkjet-printed ITO TFTs exhibited a high saturation mobility of 34.9 cm2 V^(−1) s^(−1) and a low subthreshold swing of 105 mV dec^(−1).In addition,the devices exhibited excellent electrical stability under positive bias illumination stress(PBIS,ΔV_(th)=0.31 V)and negative bias illuminaiton stress(NBIS,ΔV_(th)=−0.29 V)after 10,000 s voltage bias *** remarkably,fully printed n-type metal–oxide–semiconductor(NMOS)inverter based on ITO TFTs exhibited an extremely high gain of 181 at a low-supply voltage of 3 V,promising for advanced electronics applications.

关键词： Printed electronics Indium tin oxide Thin-film transistors coffee-ring effect NMOS inverters

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Intrinsically Viscoelastic Supramolecular Conjugated Polymer toward Suppressing coffee-ring effect

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CCS Chemistry 2022年第11期4卷 3529-3539页

作者： Yamin Han Lubing Bai Xiang An Man Xu Chuanxin Wei Zongqiong Lin Mengna Yu Jinyi Lin Lili Sun Ning Sun Changting Wei Linghai Xie Xuehua Ding Qi Wei Chengrong Yin Chenghui Li Wenming Su Wei Huang Key Laboratory of Flexible Electronics(KLOFE) Institute of Advanced Materials(IAM)Nanjing Tech University(NanjingTech)Nanjing 211816 Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)Shaanxi Institute of Biomedical Materials and Engineering(SIBME)Northwestern Polytechnical University(NPU)Xi’an 710072 State Key Laboratory of Organic Electronics and Information Displays Institute of Advanced Materials(IAM)Nanjing University of Posts&TelecommunicationsNanjing 210023 State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing National Laboratory of MicrostructuresNanjing UniversityNanjing 210093 Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhouJiangsu 215123

The rational molecular design of light-emitting conjugated polymers that inherently suppress the ubiquitous coffee-ring effect(CRE)is a great challenge and the critical bottleneck for printing ***,we describe a supramolecular route to construct an intrinsically viscoelastic rigid conjugated polymer(RCP)(PHDPF-Cz)toward avoiding the CRE without sacrificing optoelectronic ***π-πstacking interactions derived fromthe pendant carbazole(Cz)units enable PHDPF-Cz to self-assemble into criss-cross nanofibers and endow its solutionwith great ***,a high-quality and continuous PHDPFCz film was obtained by impeding the transport of aggregates to the droplet edge due to outward capillary flow during evaporation,in sharp contrast to the random aggregate migration and rapid precipitation generated fromthe controlled poly[4-(6-(9H-diphenylaniline-9-yl)hexyloxy)-9,9-diphenylfluorene]-co-[5-(6-(9H-diphenylaniline-9-yl)hexyloxy)-9,9-diphenylfluorene]and poly(9,9-dioctylfluorene)***,an efficient random laser is also achieved based on these cross-linked films with ultrastable single-chain excitonic behavior,confirming the effectiveness of our design strategy.

关键词： coffee-ring effect rigid conjugated polymer supramolecular criss-cross nanofibers optoelectronic properties

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Controlled 2D growth of organic semiconductor crystals by suppressing “coffee-ring” effect

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Nano Research 2020年第9期13卷 2478-2484页

作者： Wei Wang Bei Lu Wei Deng Xiujuan Zhang Zhengjun Lu Di Wu Jiansheng Jie Xiaohong Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Key Laboratory of Materials Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Owing to enhanced charge transport efficiency arising from the ultrathin nature,two-dimensional(2D)organic semiconductor single crystals(OSSCs)are emerging as a fascinating platform for high-performance organic field-effect transistors(OFETs).However,ucoffee-ring"effect induced by an evaporation-induced convective flow near the contact line hinders the large-area growth of 2D OSSCs through a solution ***,we develop a new strategy of suppressing the"coffee-ring"effect by using an organic semiconductor:polymer blend *** the high-viscosity polymer in the organic solution,the evaporation-induced flow is remarkably weakened,ensuring the uniform molecule spreading for the 2D growth of the *** an example,wafer-scale growth of crystalline film consisting of few-layered 2,7-didecylbenzothienobenzothiophene(C10-BTBT)crystals was successfully accomplished via blade *** based on the crystalline film exhibited a maximum hole mobility up to 12.6 cm^2·V^-1·s^-1,along with an average hole mobility as high as 8.2 cm^2·V^-1·s^-*** work provides a promising strategy for the large-area growth of 2D OSSCs toward high-performance organic electronics.

关键词： two-dimensional(2D)organic semiconductor single crystals two-dimensional(2D)growth mode coffee-ring effect organic field-effect transistors

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Fabrication of Circuit Arrays on Paraffin wax patterned Substrates based on the coffee-ring effect

Fabrication of Circuit Arrays on Paraffin wax patterned Subs...

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中国化学会第十三届全国分析化学年会

作者： Peng Ma Wei Du Bi-Feng Liu College of Life Science and Technology Huazhong University of Science and Technology

Rapid and precise patterning of metal nanoparticals is extremely essential for construction of advanced functional devices. Here, We demonstrate the fabrication of regular one-dimensional wires based on wetting and evaporation of nanoparticles suspension, akin to the coffee-ring effect. Briefly, Pipette a gold nanoparticlas suspension onto a paraffin wax film patterned with distinct hydrophilic/hydrophobic areas, and the solution will self-confine into predefined hydrophilic geometies, followed by the solvent evaporation and the assembly of nanoparticals into well-defined 1 D pattern. Various shapes can be generated by varying the paraffin wax film pattern. Also, the wire can be transferred into PDMS elastomer sheet by encapsulating. The shape can be easily changed, and the area can be scale up to lager, so it will open an avenue for fabricating large scale functional materials facilating the development of nanoscale electronic, optoelectronic, plasmonic, magnetic, and biosensing devices.

关键词： Circuit arrays Assembly Nanoparticles coffee-ring effect

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Reducing the Universal “coffee-ring effect” by a Vapor-Assisted Spraying Method for High-Efficiency CH3NH3PbI3 Perovskite Solar Cells

Reducing the Universal “Coffee-Ring Effect” by a Vapor-Ass...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Haibin Chen Xu Pan Songyuan Dai Shaopeng Yang Hebei University Chinese Academy of Sciences North China Electric Power University

Herein, spray coating as a deposition technique was explored to prepare perovskite films and break the bottleneck that plagued large-scale production. However, it is hard to reduce the notorious "coffee-ring effect" during the process of spraying perovskite films especially in a one-step spraying method. Thus, the vapor-assisted spraying method(VASM), namely, fabricating perovskite films through a vapor-solid in situ reaction between CHNHI vapor and sprayed PbI films, was creatively applied to the preparation of dense and uniform perovskite films. The surfaces of the sprayed PbI films were optimized by adjusting the wettability, viscosity, and contact quality via various methods such as the selection of solvent, solution concentration, and substrate temperature to inhibit the capillary flow and release the pinning contact line. The application of a component solvent could effectively crush the dense structure of the PbI film, optimizing the morphology of PbI films and reducing the influence of the coffee-ring effect. Integrating the above aspects, the optimized PbI films could form uniform perovskite films via an in situ reaction, and a best power conversion efficiency of 17.56% was achieved for planar structure PSCs, which is high among the PSCs fabricated by the spraying method. In addition, the VASM could be applied in the actual conditions for mass production, exhibiting excellent optical and electrical properties and paving the way of the commercialization of PSCs.

关键词： vapor-assisted spraying perovskite film surface optimization coffee-ring effect large area

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Formation of wavy-ring crack in drying droplet of protein solutions

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Science China(Technological Sciences) 2018年第7期61卷 949-958页

作者： GAO MengNi HUANG XianFu ZHAO YaPu State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

The formations of desiccation cracks and their pattems in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal droplets, followed by the formations of desiccation cracks. Two categories of highly ordered crack patterns, which we name ＂daisy＂ and ＂wavy-ring＂, are identified in the drying droplets. We explore the shifting of crack patterns from the ＂daisy＂ to the ＂wavy-ring＂ by varying the concentration of protein droplets. The results show that the concentration correlates with the pattern of deposition film directly, and modulates the periodicity of the crack pattern. We investigate the formations and periodicities of these two kinds of crack patterns, and obtain the scaling law of periodicity of the ＂wavy-ring＂ crack pattern. The relationship between the deposition pattern and the highly ordered crack patterns is also examined. This study will help in understanding the formation mechanisms of crack patterns in drying droplets of protein solutions and assist the future design of crack patterns in practical applications.

关键词： coffee-ring effect spiral crack self-organization crack pattern desiccation

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