Flexible and Cellulose-based Organic Electronics

Edberg, Jesper

doi:10.3384/diss.diva-1089149

Cited by 3 publications

(6 citation statements)

References 134 publications

(163 reference statements)

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“…The redox reactions correspond to an electron transfer process between an oxidised and a reduced species. A thermodynamic interdependency between the extent of charge acceptance Δq and the change in potential ΔV allows capacitance to be determined by derivative d(Δq)/d(ΔV) or dq/dV [27,28] .…”

Section: Pseudocapacitormentioning

confidence: 99%

“…In electrochemical impedance spectroscopy (EIS), the device under test is subject to a sinusoidal signal, either alternating potential (PEIS, E t ) or alternating current (GEIS, I t ) of small amplitude. (27) or (28) If a potential is applied, the current response of the cell is measured. Ohm's law is also valid for impedance Z in Ω, as depicted by equation (29).…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

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Screen Printing Technology for Energy Devices

Willfahrt¹

2019

Linköping Studies in Science and Technology. Dissertations

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The technical application of screen and stencil printing has been state of the art for decades. As part of the subtractive production process of printed circuit boards, for instance, screen and stencil printing play an important role. With the end of the 20th century, another field has opened up with organic electronics. Since then, more and more functional layers have been produced using printing methods. Printed electronics devices offer properties that give almost every freedom to the creativity of product development. Flexibility, low weight, use of non-toxic materials, simple disposal and an enormous number of units due to the production process are some of the prominent keywords associated with this field. Screen printing is a widely-used process in printed electronics, as this process is very flexible with regard to the materials that can be used. In addition, a minimum resolution of approximately 30 µm is sufficiently high. The ink film thickness, which can be controlled over a wide range, is an extremely important advantage of the process. Depending on the viscosity, layer thicknesses of several hundred nanometres up to several hundred micrometres can be realised. The conversion and storage of energy is an important topic, either in the field of renewable energies or the energy supply of the Internet of Things (IoT). This thesis addresses the print production of both device classes. Vertically structured thermoelectric generators (TEGs) for energy conversion and stacked supercapacitors for energy storage are produced by screen printing. Papers I-IV focus on the generation of functional layers of vertically aligned thermoelectric generators. These can convert heat directly into electrical energy. The vertical design was chosen due to the simple application of the device at the heat source. The general feasibility of screen-printed, vertically aligned TEGs was demonstrated. Optimisation of the thermoelectric materials is required, so that the process can be used sensibly. In paper III, the Ni containing model ink was optimised for filling the cavities in the insulator layer. In paper IV the printed thermoelectric generators are modelled. The performance of a set of parameters can be estimated by this model. The high Seebeck coefficient of ionic conductors is used in paper V in so-called ionic thermoelectric supercapacitor (ITESC), a combination of TEG and supercapacitor. Paper VI presents an environmentally friendly supercapacitor with a printable separator based on cornstarch and citric acid, which has a competitive electrochemical performance compared to printed supercapacitors reported elsewhere. In paper VII, some parameters of screen-printed primary Zn/MnO 2 cells are optimised and a printable separator based on cornstarch and lactic acid was successfully tested. "The journey is the reward" Confucius comes closest to german aphorism "Der Weg ist das Ziel". This sentence best describes how I feel about my doctoral thesis, which is now being completed. The journey was longer than I initially thought, bu...

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Section: Pseudocapacitormentioning

confidence: 99%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Screen Printing Technology for Energy Devices

Willfahrt¹

2019

Linköping Studies in Science and Technology. Dissertations

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“…Charge transport in disordered conducting polymers can be described via phonon-assisted hopping between localized sites (43,44), while for highly ordered conducting polymers band transport model applies (42). Charge transport also depends on several factors including polaron formation energy, the orbital coupling between polymers and energetic and spatial disorder (45).…”

Section: Charge Transportmentioning

confidence: 99%

“…(a) A schematic diagram of electrochemical double layer, (b) the potential distribution across the electrode -electrolyte interface [adapted from(24,45)]. Before studying the electron transfer, it is essential to understand the electrical properties of the interface between the electrode and the electrolyte since it enables and affects the electron transfer(122).…”

mentioning

confidence: 99%

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Conducting Polymer Electrodes for Thermogalvanic Cells

Wijeratne

2018

Linköping Studies in Science and Technology. Dissertations

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Donata, Ellen, and Dan, for being good friends for all these years, for all the memorable parties they organized in their place, for the best time we shared during their stay in Norrkoping. Robert, the Australian friend, for being my other main collaborator throughout these years, for sharing, encouraging, helping and exciting discussions, for all the fun time we shared during these years. Jesper, for being a close friend and for the excellent help in finishing the most challenging Ph.D. course 'Advanced Organic Electronics' ever I took. Felipe, for being a good friend and for sharing jokes and exciting discussions. Eliot, my photography teacher, for elevating my interest in photography Josefine and Theresia, for being my first Swedish friends and sharing the office room in Täppan and help in translating. Maria, Elina, and Ioannis (Yainni), the Greek friends, for your wonderful friendship and all the fun time we shared. Anna H., for helping with equipment, and chemicals ordering Ziauddin (Zia 2.0), for discussing the latest updates in the Cricket world (our favorite sport) and for interesting discussion in electrochemistry.

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Organic Bioelectronics for Neurotransmitter Release at the Speed of Life

Sjöström

2021

Linköping Studies in Science and Technology. Dissertations

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Flexible and Cellulose-based Organic Electronics

Cited by 3 publications

References 134 publications

Screen Printing Technology for Energy Devices

Screen Printing Technology for Energy Devices

Conducting Polymer Electrodes for Thermogalvanic Cells

Organic Bioelectronics for Neurotransmitter Release at the Speed of Life

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