Roll-to-Roll Embedding of Conductive Sintered Silver Grids
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
R2R embedding of conductive sintered grids:
Within the organic light emitting diode(OLED) and organic photovoltaic(OPV) applications, to improve the efficiency of these devices, high conductive metal grids are required to replace tin-doped indium oxide (ITO) as an anode. High conductive metal grid, can be obtained by screen prinitng of the metal shunt lines which are several microns thick. In order to avoid the risk of electrical shorts, the height
of the metal shunt lines should be minimized as much as possible, so that other active layers can be coated above it. But, the surface topology of the metal shunt lines greatly influences the active layers coated above it. New concept has been developed to address the problem of surface topology at Holst Centre.
New concept developed constitutes of embedding of the screen printed silver conductive sintered grids in the ultra violet (UV) sensitive transparent resist, which is cured on the polyethylene naphthalate (PEN) foil using the roll-to-roll (R2R) process. By doing so, we obtain the metal shunt lines in combination with the resist having more or less a flat surface profile. Characterization methods namely scanning electron microscopy (SEM), dektak profilometry, atomic force microscopy (AFM), optical interferometry and confocal microscopy measurements were performed on the samples. Surface profile measurements were performed on the screen printed silver shunt lines and also on the embedded shunt lines. Height of the screen printed silver tracks was approximately 1.2 m, and of the embedded shunt lines was approximately 130 nm, which means that the percentage of the embedding of shunt lines is approximately 93%. R2R embedded shunt lines were integrated successfully into an organic light emitting diode (OLED) device.
Place, publisher, year, edition, pages
2012. , 81 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-98676OAI: oai:DiVA.org:kth-98676DiVA: diva2:538459
Master of Science - Nanotechnology
Lourdudoss, Sebastian, Professor