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Title In Quest of Printed Electrodes for Light-emitting Electrochemical Cells: A Comparative Study between Two Silver Inks
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Discipline/Department Physics
University/Publisher Umeå University
Abstract This thesis presents a comparative study between two silver nanoparticle inks that were deposited using a Drop-on-Demand (DoD) inkjet printer, aiming at finding a functional ink that can be used to print electrodes in Light-emitting Electrochemical Cells (LECs). To achieve this, a DoD inkjet printer was installed and an acquaintance with the printer was attained. Among the two inks, one was employed as received while the other was reformulated, and successful deposition of both the inks was observed. During the reformulation process, it was seen that the highly volatile tetrahydrofuran (THF) solvent can be used to improve the ink properties, in contrast to what is recommended. After that, the inks were deposited on UV-ozone treated glass substrates, sintered at an elevated temperature under ambient conditions, and their specific resistances and thicknesses were measured. Finally, the inks were used to print the anode in a structured sandwich-cell LEC. The performance comparison was conducted by observing the emitted light of the LECs. The results indicate that the reformulated ink performs better, probably due to the lower silver concentration that results in flatter surface, which in turn effectively alleviates shorts.
Subjects/Keywords LEC; light-emitting electrochemical cells; conductive nano-particle inks; silver inks; inkjet printer; organic electronics
Language en
Country of Publication se
Record ID oai:DiVA.org:umu-62827
Repository diva
Date Indexed 2020-01-03

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…x29;, the functional fluids must have properties that fall within a defined window. The fluid can be aqueous or solventbased, and both solutions and particle suspensions can work. For good performance, the fluids should have a viscosity of 10-12 cps…

…a trial-and-error approach to establish the minimum linewidth. a b Figure 12: Single line of Ag nano particles (printed with Ink#1) deposited on the glass substrate (photos were captured by the fiducial camera) illustrating the…

…wt %) Particle-size (nm) Surface tension (dynes/cm) 6.6 US $ (approx.) Polar solvent- triethylene glycol monoethyl ether (TGME) 31.09 ≤50 36.6 0.4 US $ (approx.) Organic CompoundUnknown 10 ≤40…

…the particle-ligand bonds are broken. This leads to a direct physical contact between the Ag-particles. High conductivity is achieved after sintering through the formation of percolation channels, rather than through the complete collapse of the…

…nanoparticles into bulk metal.[21] The sintering process for Ink#2 is different. Ink#2 is a transparent, ‘non-particle-type’ ink and the organic dispersant of this ink is designed so that it remains in the liquid phase as a coating of the Agparticle…

…metallic silver with a slight yellow tint (see figure 17d). a b c d Figure 17: Photographs of Ink#2-printed traces when sintered for more than 15 min, taken at different temperatures: a) at ~60C, b) at ~90C, c) at ~100C and d…

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