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  • 51.
    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.

  • 52.
    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.

  • 53.
    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.

  • 54.
    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.

  • 55.
    Tybrandt, Klas
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Berggren, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Logic gates based on ion transistors2012In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 3, no 871Article in journal (Refereed)
    Abstract [en]

    Precise control over processing, transport and delivery of ionic and molecular signals is of great importance in numerous fields of life sciences. Integrated circuits based on ion transistors would be one approach to route and dispense complex chemical signal patterns to achieve such control. To date several types of ion transistors have been reported; however, only individual devices have so far been presented and most of them are not functional at physiological salt concentrations. Here we report integrated chemical logic gates based on ion bipolar junction transistors. Inverters and NAND gates of both npn type and complementary type are demonstrated. We find that complementary ion gates have higher gain and lower power consumption, as compared with the single transistor-type gates, which imitates the advantages of complementary logics found in conventional electronics. Ion inverters and NAND gates lay the groundwork for further development of solid-state chemical delivery circuits.

  • 56.
    Zoric, Goranka
    et al.
    Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering. Linköping University, The Institute of Technology.
    Pandzic, Igor S
    Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia.
    On creating multimodal virtual humans-real time speech driven facial gesturing2011In: MULTIMEDIA TOOLS AND APPLICATIONS, ISSN 1380-7501, Vol. 54, no 1, p. 165-179Article in journal (Refereed)
    Abstract [en]

    Because of extensive use of different computer devices, human-computer interaction design nowadays moves towards creating user centric interfaces. It assumes incorporating different modalities that humans use in everyday communication. Virtual humans, who look and behave believably, fit perfectly in the concept of designing interfaces in more natural, effective, as well as social oriented way. In this paper we present a novel method for automatic speech driven facial gesturing for virtual humans capable of real time performance. Facial gestures included are various nods and head movements, blinks, eyebrow gestures and gaze. A mapping from speech to facial gestures is based on the prosodic information obtained from the speech signal. It is realized using a hybrid approach-Hidden Markov Models, rules and global statistics. Further, we test the method using an application prototype-a system for speech driven facial gesturing suitable for virtual presenters. Subjective evaluation of the system confirmed that the synthesized facial movements are consistent and time aligned with the underlying speech, and thus provide natural behavior of the whole face.

12 51 - 56 of 56
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