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Drop-on-Demand Inkjet

Metal electrodes can be applied onto photovoltaic devices using digital printing technologies (Drop-on-Demand Inkjet). The metallizations can be used as front grid electrodes. The electrodes are based on silver nanoparticle inks and can be printed from stabilized suspensions. The as-printed features are transformed into conductive structures by heat exposure. Without any pretreatment, resolutions of 100 µm on a planar SIS solar cell are feasible. In order to achieve higher resolutions a laser sintering process is under investigation. In this process the as-printed features are rewritten using a laser. This enables a selective sintering of narrow conductive tracks. Since the laser-heated volume depends strongly on the focal diameter of the laser, structure sizes of few micrometers are achievable.

Next steps include the connection of several solar cell modules using a laser-based flux-free soldering process and printed metallizations. Laser-based soldering is a contact-free technique and allows for electrical connection and mechanical fixation of sensitive materials with a minimized and localized transfer of thermal energy. A parametric study of the soldering process and an investigation of appropriate reflow strategies for the generation of long-term stable electrical contacts on SIS- and Nano-SIS-Systems will be carried out.


Laser sintering setup


SIS system with printed frontgrid

Startseite UNI Jena

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