Publication date: 31st July 2014
Some results on dye-sensitized solar cell (DSC) prototypes from Tezca were discussed in previous meeting. In this conference, the latest results on flexible DSC prototypes, in terms of packaging, flexibility, encapsulation, performance improvement and some electrical parameters will be discussed. Adhesion between the layers was a problem for packaging. The application of atmospheric plasma onto the surfaces of DSC components just prior to sealing was found to improve adhesion significantly. Instead of using expensive ultra-high plastic barriers, we decided to use flexible glass. It is a cheaper solution, but its adhesion to the sealant was very poor. Atmospheric plasma also helped improve adhesion considerably. Electrolyte injection was optimized by using two holes at the counterelectrode. Short-circuit was avoided by depositing a dielectric layer at the back of the photoelectrode substrate. This insulating layer avoided short-circuit and enhanced the performance of the prototypes, probably by minimizing charge recombination losses at this interface. Sensitization time was shortened to only 30 minutes by controlling the power of a ultrasonic machine and heating the bath accordingly. Weldering was another problem due to the poor adhesion to the stainless steel foils. Molex connectors were used in conjunction with a tab connection, which allowed for serial connection of the solar cells. These advances in prototyping will be outlined and discussed at the conference.
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