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Zhu P, He Z, Liu S, Liu L, Huang Y, Li J. A highly elastic conductive film prepared by bidirectional AS-LBL method. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2021.110868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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2
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Liu S, Billig P, Al-Shadeedi A, Kaphle V, Lüssem B. Doped bottom-contact organic field-effect transistors. NANOTECHNOLOGY 2018; 29:284001. [PMID: 29570095 DOI: 10.1088/1361-6528/aab93a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The influence of doping on doped bottom-gate bottom-contact organic field-effect transistors (OFETs) is discussed. It is shown that the inclusion of a doped layer at the dielectric/organic semiconductor layer leads to a significant reduction in the contact resistances and a fine control of the threshold voltage. Through varying the thickness of the doped layer, a linear shift of threshold voltage V T from -3.1 to -0.22 V is observed for increasing thickness of doped layer. Meanwhile, the contact resistance at the source and drain electrode is reduced from 138.8 MΩ at V GS = -10 V for 3 nm to 0.3 MΩ for 7 nm thick doped layers. Furthermore, an increase of charge mobility is observed for increasing thickness of doped layer. Overall, it is shown that doping can minimize injection barriers in bottom-contact OFETs with channel lengths in the micro-meter regime, which has the potential to increase the performance of this technology further.
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Affiliation(s)
- Shiyi Liu
- Department of Physics, Kent State University, Kent, OH, 44242, United States of America
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3
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Sun J, Park H, Jung Y, Rajbhandari G, Maskey BB, Sapkota A, Azuma Y, Majima Y, Cho G. Proving Scalability of an Organic Semiconductor To Print a TFT-Active Matrix Using a Roll-to-Roll Gravure. ACS OMEGA 2017; 2:5766-5774. [PMID: 31457835 PMCID: PMC6644715 DOI: 10.1021/acsomega.7b00873] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/30/2017] [Indexed: 05/29/2023]
Abstract
Organic semiconductor-based thin-film transistors' (TFTs) charge-carrier mobility has been enhanced up to 25 cm2/V s through the improvement of fabrication methods and greater understanding of the microstructure charge-transport mechanism. To expand the practical feasibility of organic semiconductor-based TFTs, their electrical properties should be easily accessed from the fully printed devices through a scalable printing method, such as a roll-to-roll (R2R) gravure. In this study, four commercially available organic semiconductors were separately formulated into gravure inks. They were then employed in the R2R gravure system (silver ink for printing gate and drain-source electrodes and BaTiO3 ink for printing dielectric layers) for printing 20 × 20 TFT-active matrix with the resolution of 10 pixels per inch on poly(ethylene terephthalate) (PET) foils to attain electrical properties of organic semiconductors a practical printing method. Electrical characteristics (mobility, on-off current ratio, threshold voltage, and transconductance) of the R2R gravure-printed 20 × 20 TFT-active matrices fabricated with organic semiconducting ink were analyzed statistically, and the results showed more than 98% device yield and 50 % electrical variations in the R2R gravure TFT-active matrices along the PET web.
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Affiliation(s)
- Junfeng Sun
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
| | - Hyejin Park
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
| | - Younsu Jung
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
| | - Grishmi Rajbhandari
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
| | - Bijendra Bishow Maskey
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
| | - Ashish Sapkota
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
| | - Yasuo Azuma
- Materials
and Structure Laboratory, Tokyo Institute
of Technology, Yokohama 226-8503, Japan
| | - Yutaka Majima
- Materials
and Structure Laboratory, Tokyo Institute
of Technology, Yokohama 226-8503, Japan
| | - Gyoujin Cho
- Department
of Printed Electronics Engineering of Sunchon National University, National University, Sunchon 540-742, Korea
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Yang Y, Rice B, Shi X, Brandt JR, Correa da Costa R, Hedley GJ, Smilgies DM, Frost JM, Samuel IDW, Otero-de-la-Roza A, Johnson ER, Jelfs KE, Nelson J, Campbell AJ, Fuchter MJ. Emergent Properties of an Organic Semiconductor Driven by its Molecular Chirality. ACS NANO 2017; 11:8329-8338. [PMID: 28696680 DOI: 10.1021/acsnano.7b03540] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chiral molecules exist as pairs of nonsuperimposable mirror images; a fundamental symmetry property vastly underexplored in organic electronic devices. Here, we show that organic field-effect transistors (OFETs) made from the helically chiral molecule 1-aza[6]helicene can display up to an 80-fold difference in hole mobility, together with differences in thin-film photophysics and morphology, solely depending on whether a single handedness or a 1:1 mixture of left- and right-handed molecules is employed under analogous fabrication conditions. As the molecular properties of either mirror image isomer are identical, these changes must be a result of the different bulk packing induced by chiral composition. Such underlying structures are investigated using crystal structure prediction, a computational methodology rarely applied to molecular materials, and linked to the difference in charge transport. These results illustrate that chirality may be used as a key tuning parameter in future device applications.
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Affiliation(s)
| | | | | | | | - Rosenildo Correa da Costa
- Faculty of Computing, Engineering and Science, University of South Wales , Cemetery Road, Glyntaff, Pontypridd CF37 4BD, United Kingdom
| | - Gordon J Hedley
- University of St. Andrews , North Haugh, Fife KY16 9SS, United Kingdom
| | - Detlef-M Smilgies
- Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University , Ithaca, New York 14853, United States
| | - Jarvist M Frost
- Department of Chemistry, University of Bath , Bath BA2 7AY, United Kingdom
- Department of Materials, Imperial College London , London SW7 2AZ, United Kingdom
| | - Ifor D W Samuel
- University of St. Andrews , North Haugh, Fife KY16 9SS, United Kingdom
| | - Alberto Otero-de-la-Roza
- Department of Chemistry, University of British Columbia, Okanagan , 3247 University Way, Kelowna, British Columbia V1V 1V7, Canada
| | - Erin R Johnson
- Department of Chemistry, Dalhousie University , Halifax, Nova Scotia B3H 4R2, Canada
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Auyeung RCY, Kim H, Mathews S, Piqué A. Spatially modulated laser pulses for printing electronics. APPLIED OPTICS 2015; 54:F70-F77. [PMID: 26560624 DOI: 10.1364/ao.54.000f70] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The use of a digital micromirror device (DMD) in laser-induced forward transfer (LIFT) is reviewed. Combining this technique with high-viscosity donor ink (silver nanopaste) results in laser-printed features that are highly congruent in shape and size to the incident laser beam spatial profile. The DMD empowers LIFT to become a highly parallel, rapidly reconfigurable direct-write technology. By adapting half-toning techniques to the DMD bitmap image, the laser transfer threshold fluence for 10 μm features can be reduced using an edge-enhanced beam profile. The integration of LIFT with this beam-shaping technique allows the printing of complex large-area patterns with a single laser pulse.
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Higgins SG, Boughey FL, Hills R, Steinke JHG, Muir BVO, Campbell AJ. Quantitative analysis and optimization of gravure printed metal ink, dielectric, and organic semiconductor films. ACS APPLIED MATERIALS & INTERFACES 2015; 7:5045-5050. [PMID: 25646647 DOI: 10.1021/am508316f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Here we demonstrate the optimization of gravure printed metal ink, dielectric, and semiconductor formulations. We present a technique for nondestructively imaging printed films using a commercially available flatbed scanner, combined with image analysis to quantify print behavior. Print speed, cliché screen density, nip pressure, the orientation of print structures, and doctor blade extension were found to have a significant impact on the quality of printed films, as characterized by the spreading of printed structures and variation in print homogeneity. Organic semiconductor prints were observed to exhibit multiple periodic modulations, which are correlated to the underlying cell structure.
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Affiliation(s)
- Stuart G Higgins
- Department of Physics and Centre for Plastic Electronics and ‡Department of Chemistry, Imperial College London, South Kensington Campus , London SW7 2AZ, United Kingdom
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