liu.seSearch for publications in DiVA
Change search
Refine search result
1 - 15 of 15
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Elfwing, Anders
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Ponseca, Carlito
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Ouyang, Liangqi
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Urbanowicz, Andrzej
    Ctr Phys Sci and Technol, Lithuania; TERAVIL Ltd, Lithuania.
    Krotkus, Arunas
    Ctr Phys Sci and Technol, Lithuania.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Inganäs, Olle
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Conducting Helical Structures from Celery Decorated with a Metallic Conjugated Polymer Give Resonances in the Terahertz Range2018In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 28, no 24, article id 1706595Article in journal (Refereed)
    Abstract [en]

    A method to decorate cellulose-based helices retrieved from the plant celery with a conductive polymer is proposed. Using a layer-by-layer method, the decoration of the polyanionic conducting polymer poly(4-(2,3-dihydrothieno [3,4-b]-[1,4]dioxin-2-yl-methoxy)-1-butanesulfonic acid (PEDOT-S) is enhanced after coating the negatively charged cellulose helix with a polycationic polyethyleneimine. Microscopy techniques and two-point probe are used to image the structure and measure the conductivity of the helix. Analysis of the optical and electrical properties of the coated helix in the terahertz (THz) frequency range shows a resonance close to 1 THz and a broad shoulder that extends to 3.5 THz, consistent with electromagnetic models. Moreover, as helical antennas, it is shown that both axial and normal modes are present, which are correlated to the orientation and antenna electrical lengths of the coated helices. This work opens the possibility of designing tunable terahertz antennas through simple control of their dimensions and orientation.

  • 2.
    Keshmiri, Vahid
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Westerberg, David
    Acreo Swedish ICT AB, Sweden.
    Sandberg, Mats
    Acreo Swedish ICT AB, Sweden.
    The Applications of OECTs in Supercapacitor Balancing Circuits2016In: 2016 7TH INTERNATIONAL CONFERENCE ON COMPUTER AIDED DESIGN FOR THIN-FILM TRANSISTOR TECHNOLOGIES (CAD-TFT), IEEE , 2016, p. 23-23Conference paper (Refereed)
    Abstract [en]

    In this paper, we investigate using OECTs in differential amplifiers and cell voltage equalizers for supercapacitor balancing circuits. The differential amplifier based on OECTs can sense voltage difference and the voltage equalizer consisting of a microcontroller and OECTs can be used to charge supercapacitors to desired voltages.

  • 3.
    Keshmiri, Vahid
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Larsen, C.
    Umeå University, Sweden.
    Edman, L.
    Umeå University, Sweden.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    A Current Supply with Single Organic Thin-Film Transistor for Charging Supercapacitors2016In: THIN FILM TRANSISTORS 13 (TFT 13), ELECTROCHEMICAL SOC INC , 2016, Vol. 75, no 10, p. 217-222Conference paper (Refereed)
    Abstract [en]

    We present a current supply, comprising a single organic thin-film transistor (OTFT), for the charging of supercapacitors. The current supply takes power from the electric grid (115 V AC, US standard), converts the AC voltage to a quasi-constant DC current (similar to 0.1 mA) regardless of the impedance of the load, and charges the supercapacitor. Solution-processed OTFTs based on the popular polymeric semiconductor poly(3-hexylthiophene- 2,5-diyl) have been developed to rectify the 115 V AC voltage. A diodeconfigured OTFT was used as a half-wave rectifier. The single OTFT current supply was demonstrated to charge a 220 mF supercapacitor to 1 V directly using 115 V AC voltage as the input. This work paves the road towards all-printable supercapacitor energy-storage systems with integrated chargers, which enable direct charging from a power outlet.

  • 4.
    Keshmiri, Vahid
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Westerberg, David
    Acreo Swedish ICT AB, Sweden.
    Andersson Ersman, Peter
    Acreo Swedish ICT AB, Sweden.
    Sandberg, Mats
    Acreo Swedish ICT AB, Sweden.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    A Silicon-Organic Hybrid Voltage Equalizer for Supercapacitor Balancing2017In: IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS, ISSN 2156-3357, Vol. 7, no 1, p. 114-122Article in journal (Refereed)
    Abstract [en]

    Cell voltage equalizers are an important part in electric energy storage systems comprising series-connected cells, for example, supercapacitors. Hybrid electronics with silicon chips and printed devices enables electronic systems with moderate performance and low cost. This paper presents a silicon-organic hybrid voltage equalizer to balance and protect series-connected supercapacitor cells during charging. Printed organic electrochemical transistors with conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) are utilized to bypass excess current when the supercapacitor cells are fully charged to desired voltages. In this study, low-cost silicon microcontrollers (ATtiny85) are programmed to sense voltages across the supercapacitor cells and control the organic electrochemical transistors to bypass charging current when the voltages exceed 1 V. Experimental results show that the hybrid equalizer with the organic electrochemical transistors works in dual-mode, switched-transistor mode or constant-resistor mode, depending on the charging current applied (0.3-100 mA). With the voltage equalizer, capacitors are charged equally regardless of their capacitances. This work demonstrates a low-cost hybrid solution for supercapacitor balancing modules at large-scale packs.

  • 5.
    Larsen, Christian
    et al.
    Umeå University, Sweden.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Edman, Ludvig
    Umeå University, Sweden.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Design, fabrication and application of organic power converters: Driving light-emitting electrochemical cells from the AC mains2017In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 45, p. 57-64Article in journal (Refereed)
    Abstract [en]

    The design, fabrication and operation of a range of functional power converter circuits, based on diode configured organic field-effect transistors as the rectifying unit and capable of transforming a high AC input voltage to a selectable DC voltage, are presented. The converter functionality is demonstrated by selecting and tuning its constituents so that it can effectively drive a low-voltage organic electronic device, a light-emitting electrochemical cell (LEC), when connected to high-voltage AC mains. It is established that the preferred converter circuit for this task comprises an organic full-wave rectifier and a regulation resistor but is void of a smoothing capacitor, and that such a circuit connected to the AC mains (230 V, 50 Hz) successfully can drive an LEC to bright luminance (360 cd m(-2)) and high efficiency (6.4 cd A(-1)). (C) 2017 Elsevier B.V. All rights reserved.

  • 6.
    Szymanski, Marek
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    2-D Drift-Diffusion Simulation of Organic Electrochemical Transistors2017In: IEEE Transactions on Electron Devices, ISSN 0018-9383, E-ISSN 1557-9646, Vol. 64, no 12, p. 5114-5120Article in journal (Refereed)
    Abstract [en]

    A 2-D device model of the organic electrochemical transistor is described and validated. Devices with channel length in range 100 nm-10 mm and channel thickness in range 50 nm-5 mu m are modeled. Steady-state, transient, and AC simulations are presented. Using the realistic values of physical parameters, the results are in good agreement with the experiments. The scaling of transconductance, bulk capacitance, and transient responses with device dimensions is well reproduced. The model reveals the important role of the electrical double layers in the channel, and the limitations of device scaling.

  • 7.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Organic Power Converters: Design, Fabrication, and Applications2017In: 2017 24TH INTERNATIONAL WORKSHOP ON ACTIVE-MATRIX FLATPANEL DISPLAYS AND DEVICES (AM-FPD), IEEE , 2017, p. 77-80Conference paper (Refereed)
    Abstract [en]

    It has been a challenging task for organic electronic devices to control and convert electric power due to their vulnerability when exposed to high voltages. In this work, the design, fabrication, and applications of AC-DC and DC-AC organic power converters based on high-voltage organic thin-film transistors are presented. The organic AC-DC converters, comprising diode-configured high voltage organic thin-film transistors as the rectifying unit, is capable of transforming a high AC input voltage to a selectable DC voltage. On the contrary, the organic DC-AC converter, using an astable multivibrator as oscillation generator, is capable of converting a high DC voltage to a high AC voltage as a power inverter. The functionality of the organic AC-DC power converter is demonstrated through charging supercapacitors as a quasi-constant current supply and, in addition, the successful driving of organic light-emitting devices to high luminescence and efficiency. Expanding the application of organic thin-film transistors into power conversion paves the road towards organic power electronics for cost-efficient and Eco-friendly power electronics in the future.

  • 8.
    Tu, Deyu
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Information Coding.
    Forchheimer, Robert
    Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Information Coding.
    Self-oscillation in electrochemical transistors: An RLC modeling approach2012In: Solid-State Electronics, ISSN 0038-1101, E-ISSN 1879-2405, Solid-State Electronics: an international journal, ISSN 0038-1101, Vol. 69, p. 7-10Article in journal (Refereed)
    Abstract [en]

    We propose an RLC model for PEDOT:PSS electrochemical transistors to interpret the persistent oscillating currents observed in experiments. The electrochemical reaction is represented by an inductor in the equivalent circuit. The simulation results show that an electrochemical device can be operated as normal transistors or oscillators under different voltage bias. This model predicts that analog circuit functions can be realized with "inductor-like" electrochemical devices.

  • 9.
    Tu, Deyu
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Herlogsson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology, Physics and Electronics.
    Crispin, Xavier
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology, Physics and Electronics.
    Berggren, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology, Physics and Electronics.
    Parameter extraction for electrolyte-gated organic field effect transistor modeling2011Conference paper (Refereed)
    Abstract [en]

    We present a methodology to extract parameters for an electrolyte-gated organic field effect transistor DC model. The model is based on charge drift/diffusion transport under electric field and covers all regimes. Voltage dependent capacitance, mobility, contact resistance and threshold voltage shift are taken into account in this model. The feature parameters in the model are simply extracted from the transfer or output characteristics of electrolyte-gated organic field effect transistors. The extracted parameters are verified by good agreements between experimental and simulated results.

  • 10.
    Tu, Deyu
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Information Coding.
    Herlogsson, Lars
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Kergoat, Loig
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Crispin, Xavier
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology, Physics and Electronics.
    Berggren, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    A Static Model for Electrolyte-Gated Organic Field-Effect Transistors2011In: IEEE Transactions on Electron Devices, ISSN 0018-9383, E-ISSN 1557-9646, Vol. 58, no 10, p. 3574-3582Article in journal (Refereed)
    Abstract [en]

    We present a dc model to simulate the static performance of electrolyte-gated organic field-effect transistors. The channel current is expressed as charge drift transport under electric field. The charges accumulated in the channel are considered being contributed fromvoltage-dependent electric-doublelayer capacitance. The voltage-dependent contact effect and short-channel effect are also taken into account in this model. A straightforward and efficient methodology is presented to extract the model parameters. The versatility of this model is discussed as well. The model is verified by the good agreement between simulation and experimental data.

  • 11.
    Tu, Deyu
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Kergoat, Loïg
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. Norrköping Sweden.
    Crispin, Xavier
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. Norrköping Sweden.
    Berggren, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. Norrköping Sweden.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Transient analysis of electrolyte-gated organic field effect transistors2012In: SPIE Proceedings Vol. 8478: Organic Field-Effect Transistors XI / [ed] Zhenan Bao; Iain McCulloch, 2012, Vol. 8478, p. 84780L-1-84780L-8Conference paper (Refereed)
    Abstract [en]

    A terminal charge and capacitance model is developed for transient behavior simulation of electrolyte-gated organic field effect transistors (EGOFETs). Based on the Ward-Dutton partition scheme, the charge and capacitance model is derived from our drain current model reported previously. The transient drain current is expressed as the sum of the initial drain current and the charging current, which is written as the product of the partial differential of the terminal charges with respect to the terminal voltages and the differential of the terminal voltages upon time. The validity for this model is verified by experimental measurements.

  • 12.
    Tu, Deyu
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Nilsson, David
    Acreo AB, Sweden.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Electrochromic Electrochemical Transistors Gated With Polyelectrolyte-Decorated Amyloid Fibrils2013In: IEEE/OSA Journal of Display Technology, ISSN 1551-319X, E-ISSN 1558-9323, Vol. 9, no 9, p. 755-759Article in journal (Refereed)
    Abstract [en]

    This paper presents the use of polyelectrolyte-decorated amyloid fibrils as gate electrolyte in electrochromic electrochemical transistors. Conducting polymer alkoxysulfonate poly(3,4-ethylenedioxythiophene) (PEDOT-S) and luminescent conjugate polymer poly(thiophene acetic acid) (PTAA) are utilized to decorate insulin amyloid fibrils for gating lateral poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) electrochemical transistors. In this comparative work, four gate electrolytes are explored, including the polyelectrolytes and their amyloid-fibril complexes. The discrimination of transistor behaviors with different gate electrolytes is understood in terms of an electrochemical mechanism. The combination of luminescent polymers, biomolecules and electrochromic transistors enables multi functions in a single device, for example, the color modulation in monochrome electrochromic display, as well as biological sensing/labeling.

  • 13.
    Tu, Deyu
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Takimiya, Kazuo
    Hiroshima University, Japan.
    Zschieschang, Ute
    Max Planck Institute for Solid State Research.
    Klauk, Hagen
    Max Planck Institute for Solid State Research.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Modeling of Drain Current Mismatch in OrganicThin-Film Transistors2015In: IEEE/OSA Journal of Display Technology, ISSN 1551-319X, E-ISSN 1558-9323, Vol. 11, p. 559-563Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a consistent model to analyzethe drain current mismatch of organic thin-film transistors.The model takes charge fluctuations and edge effects into account,to predict the fluctuations of drain currents. A Poisson distributionfor the number of charge carriers is assumed to represent therandom distribution of charge carriers in the channel. The edge effectsdue to geometric variations in fabrication processes are interpretedin terms of the fluctuations of channel length and width. Thesimulation results are corroborated by experimental results takenfrom over 80 organic transistors on a flexible plastic substrate.

  • 14.
    Wang, Zhen
    et al.
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Malti, Abdellah
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Ouyang, Liangqi
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Tian, Weiqian
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Wagberg, Lars
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden; Wallenberg Wood Science Centre, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Hamedi, Mahiar Max
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Copper-Plated Paper for High-Performance Lithium-Ion Batteries2018In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 14, no 48, article id 1803313Article in journal (Refereed)
    Abstract [en]

    Paper is emerging as a promising flexible, high surface-area substrate for various new applications such as printed electronics, energy storage, and paper-based diagnostics. Many applications, however, require paper that reaches metallic conductivity levels, ideally at low cost. Here, an aqueous electroless copper-plating method is presented, which forms a conducting thin film of fused copper nanoparticles on the surface of the cellulose fibers. This paper can be used as a current collector for anodes of lithium-ion batteries. Owing to the porous structure and the large surface area of cellulose fibers, the copper-plated paper-based half-cell of the lithium-ion battery exhibits excellent rate performance and cycling stability, and even outperforms commercially available planar copper foil-based anode at ultra-high charge/discharge rates of 100 C and 200 C. This mechanically robust metallic-paper composite has promising applications as the current collector for light-weight, flexible, and foldable paper-based 3D Li-ion battery anodes.

  • 15.
    Won Lee, Sung
    et al.
    Yonsei University, South Korea.
    Shin, Minkwan
    Yonsei University, South Korea.
    Yoon Park, Jae
    Yonsei University, South Korea.
    Soo Kim, Bong
    Yonsei University, South Korea.
    Tu, Deyu
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Jeon, Sanghun
    Korea University, South Korea.
    Jeong, Unyong
    Yonsei University, South Korea.
    Thin Ion-Gel Dielectric Layer to Enhance the Stability of Polymer Transistors2015In: Science of Advanced Materials, ISSN 1947-2935, E-ISSN 1947-2943, Vol. 7, no 5, p. 874-880Article in journal (Refereed)
    Abstract [en]

    Poly(3-hexylthiophene)(P3HT) transistors with a thin ion-gel gate dielectric layer (100 nm thickness) was fabricated. The thin ion-gel dielectric layer retarded the capacitance drop at high frequencies and the diffusion of the ionic molecules in the polymer active layer that are severe drawbacks of the ion-gel dielectric transistors. Thereby, the thin ion-gel transistors showed hysteresis-free I-V characteristics, less frequency-dependence, and enhanced bias-stability. The average charge mobility was similar to 2 cm(2)/Vs and the on/off ratio was 10(4)similar to 10(5). The dependence of the capacitance and the kinetics of ion translation on the thickness of the ion-gel were discussed by both experiments and theoretical calculations.

1 - 15 of 15
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf