Product Code: ICA12_M802

Laser Scribing of ITO/ZnO Thin Films on Flexible PET-Foil for Roll-to-Roll Production of Polymer Solar Cells
Authors:
Susana Abreu Fernandes, Applied Laser Technology, Ruhr-Univ. Bochum; Bochum Germany
Benjamin Schöps, Applied Laser Technology, Ruhr-Univ. Bochum; -
Kerstin Kowalick, Applied Laser Technology, Ruhr-Univ. Bochum; Bochum
Shizhou Xiao, Applied Laser Technology, Ruhr-Univ. Bochum; -
Ralf Nett, Applied Laser Technology, Ruhr-Univ. Bochum; -
Evgeny Gurevich, Applied Laser Technology, Ruhr-Univ. Bochum; -
Matthias Schindler, Applied Laser Technology, Ruhr-Univ. Bochum; -
Andreas Ostendorf, Applied Laser Technology, Ruhr-Univ. Bochum; -
Presented at ICALEO 2012

High throughput Roll-to-Roll production of polymer solar cells on flexible substrates possesses the potential in decrease the cost per Watt dramatically. However, P1, P2 and P3 scribing processes are required for construction of serial interconnection for such large scale modules. Comparing to the established wet chemical deposition technology, laser ablation has the advantage to serial interconnect on micrometer scale with simplified process using mostly the zero-coating method in Roll-to-Roll production line.
So far the laser scribing of P1 process mainly focuses on ITO film, which is based on the typical cell geometry of substrate/ITO/Active Layer/Al. Due to the evaporation of Al, this cell geometry is not suitable in Roll-to-Roll production. Therefore an inverted layer structure based on substrate/ITO/ZnO/Active Layer/Silver paste is proposed. In this study, a femtosecond laser with 800nm wavelength and 160fs duration will be used for P1 scribing process, which refers to the ablation of ITO/ZnO layer based on the inverted cell structure. Different parameters, such as pulse energy, overlapping rate and focus position will be discussed. The quality of the scribing results, such as the rim quality and the film removal mechanism will be investigated.