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Screen Printed Thermoelectric Devices
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Thermoelectric generators (TEG) directly convert heat energy into electrical energy. The impediments as to why this technology has not yet found extensive application are the low conversion efficiency and high costs per watt. On the one hand, the manufacturing process is a cost factor. On the other, the high-­‐priced thermoelectric (TE) materials have an enormous impact on the costs per watt. In this thesis both factors will be examined: the production process and the selection of TE materials. Technical screen printing is a possible way of production, because this method is very versatile with respect to the usable materials, substrates as well as printing inks. The organic conductor PEDOT:PSS offers reasonable thermoelectric properties and can be processed very well in screen printing. It was demonstrated by prototypes of fully printed TEGs that so-­‐called vertical printed TEGs are feasible using standard graphic arts industry processes. In addition, the problems that occur with print production of TEGs are identified. Finally, approaches to solve these problems are discussed.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. , 45 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1663
Keyword [en]
Screen printing, thermoelectric generator, Seebeck effect, energy harvesting
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-106006DOI: 10.3384/lic.diva-106006ISBN: 9789175193236 (print)OAI: oai:DiVA.org:liu-106006DiVA: diva2:712773
Presentation
K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping (English)
Opponent
Supervisors
Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2017-12-15Bibliographically approved
List of papers
1. Optimising Stencil Thickness and Ink Film Deposit: An investigation about the preparation of thick film screen printing stencils and their influence on desired thick film ink or paste deposits
Open this publication in new window or tab >>Optimising Stencil Thickness and Ink Film Deposit: An investigation about the preparation of thick film screen printing stencils and their influence on desired thick film ink or paste deposits
2011 (English)In: International Circle of Educational Institutes for Graphic Arts, ISSN 1868-0879, no 4, 6-17 p.Article in journal (Refereed) Published
Abstract [en]

It is very important to control the thickness of the ink deposit in screen printing of functional pastes – especially in the field of printed electronics. In general, it is the height of the conductive tracks that can be altered in order to control the ohmic resistance since the specific resistance of the deployed material, the base area and the length of the printed structure are pre-defined. The aim of this investigation is to detect the most significant parameters that influence the ink film deposition in order to establish a dry ink film layer on the substrate which ranges between 80 to 100 microns.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-106003 (URN)
Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2014-04-23Bibliographically approved
2. Screen printing into cavities of a thick insulating layer as a part of a fully printed thermoelectric generator
Open this publication in new window or tab >>Screen printing into cavities of a thick insulating layer as a part of a fully printed thermoelectric generator
2011 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Thermoelectric generators (TEG) convert thermal energy into electricity, directly [1]. The sophisticated and therefore expensive ways of producing such TEGs presently prevent the technology to enter new markets other than space missions or the combustion systems of cars [2]. A promising approach to reduce the costs per Watt is to print the TEG structures on flexible substrates to be able to affix the flexible TEG directly on the heat source or sink. This report describes the process of assembling a fully printed TEG especially the issues that arise when printing the intermediate insulating layers in a so called vertical layout of a TEG. As the layer thicknesses all are rather thick screen and stencil printing were used. When the cavities in the insulating layer are subsequently filled with the thermoelectric leg materials the electrical contact between the top and the bottom conductors of the TEG are established. However, the cavities must be filled properly to ensure a good electrical contact. For this reason, the flow behaviour of the thermoelectric materials must be optimized for printing.

Keyword
Seebeck effect, thermoelectric generator, waste energy harvesting, screen printing
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-106004 (URN)
Conference
The 43rd annual conference of the International Circle of Educational Institutes for Graphic Arts, Technology and Management, September 19-23, Norrköping, Sweden
Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2014-04-16Bibliographically approved
3. Model for calculation of design and electrical parameters of thermoelectric generators
Open this publication in new window or tab >>Model for calculation of design and electrical parameters of thermoelectric generators
2011 (English)In: Journal of Print and Media Technology Research, ISSN 2223-8905, Vol. 4, no 201-274, 247-257 p.Article in journal (Refereed) Published
Abstract [en]

Energy harvesting - the conversion of ambient energy into electrical energy - is a frequently used term nowadays. Several conversion principles are available, e.g., photovoltaics, wind power and water power. Lesser-known are thermoelectric generators (TEG) although they were already studied actively during and after the world wars in the 20th century (Caltech Material Science, n. d.). In this work, the authors present a mathematical model for the calculation of input or output parameters of printed thermoelectric generators. The model is strongly related to existing models (Freunek et al., 2009; Rowe, 1995; Glatz et al., 2006) for conventionally produced TEGs as well as for printed TEGs. Thermal effects as investtigated by Freunek et al. (2009; 2010) could be included. In order to demonstrate the benefit of the model, two examples of calculations are presented. The parameters of the materials are derived from existing printing inks reported elsewhere (Chen et al., 2011; Wuesten and Potje-Kamloth, 2008; Zhang et al., 2010; Liu et al., 2011; Bubnova et al., 2011). The printing settings are chosen based on feasibility and convenience.

Keyword
screen printing, thermoelectric generator, energy harvesting, modelling
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-106005 (URN)
Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2017-12-05Bibliographically approved

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