Highly smooth and conductive silver film with metallo-organic decomposition ink for all-solution-processed flexible orga
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Highly smooth and conductive silver film with metalloorganic decomposition ink for all-solution-processed flexible organic thin-film transistors Yingtao Xie1
, Shihong Ouyang2, Dongping Wang2, Wen-Ya Lee3, and Hon Hang Fong2,4,*
1
Department of Electronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, People’s Republic of China 2 Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China 3 Department of Chemical Engineering and Biotechnology, Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan 4 Department of Chemical Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Received: 4 May 2020
ABSTRACT
Accepted: 19 August 2020
A facile silver metallo-organic decomposition (MOD) ink and its two-step sintering process was developed to fabricate highly conductive and smooth silver film for the flexible organic electronics. Using simple and feasible two-step sintering processes and double-layer processes, the conductivity of silver film with the facile MOD ink was greatly improved from 2.85 9 103 S cm-1 to 1.50 9 105 S cm-1, indicating about 53 times increase and about 24% bulk silver conductivity, and the surface RMS roughness was about 6 nm by atomic force microscope, nearly identical to the thermal-evaporated silver film. The XRD showed that synthesized silver thin films were composed of pure silver and well crystallized to the face-centered cubic structure, similar to metallic silver. And the full XPS spectra showed the presence of the same elements and almost identical peaks of solution-processed silver, as compared to the thermal silver surface elemental data. Besides, the silver film also demonstrated great mechanical stability and adhesion on PET substrate. At last, using silver gate/source/drain electrodes generated from the MOD ink, the all-solutionprocessed organic thin-film transistors (OTFTs) were demonstrated. The optimized OTFTs exhibited a high field mobility of 0.36 cm2 V-1 s-1 with threshold voltage of 0.35 V and on/off current ratio of 1 9 105.
Published online: 31 August 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Kevin Jones.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05140-1
J Mater Sci (2020) 55:15908–15918
Introduction In recent years, organic electronics became an emerging modern science and technology as low-cost alternatives to conventional silicon-based technologies. Due to the usage of artificially synthesized multi-functional organic materials, it has received enormous attention as a novel technology platform. Organic electronics enabled many lightweight, lowcost, mechanically flexible and large-area applications, such as organic light emitting diodes (OLEDs) [1, 2], organic thin-film transistors (OTFTs) [3, 4], organic photovoltaics (OPVs) [5, 6], biosensors [7, 8] and other flexible electronics [9–18]
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