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Formation of a conductive grid on thin film modules glass by laser-patterning

: Jaus, J.; Pantsar, H.; Adurodija, O.F.; Li, B.; Regaard, B.; Herfurth, H.; Doble, D.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Electron Devices Society:
35th IEEE Photovoltaic Specialists Conference, PVSC 2010. Vol.4 : Honolulu, Hawaii, USA, 20 - 25 June 2010
Piscataway/NJ: IEEE, 2010
ISBN: 978-1-4244-5891-2
ISBN: 978-1-4244-5890-5
ISBN: 978-1-4244-5892-9
Photovoltaic Specialists Conference (PVSC) <35, 2010, Honolulu/Hawaii>
Conference Paper
Fraunhofer ILT ()
Fraunhofer ISE ()

In thin film solar modules, transparent conductive oxides (TCOs) are commonly used as a front contact. The limited electrical conductivity and optical transparency of TCOs reduce the efficiency of thin film modules, so a compromise must be achieved between low-light absorption and good electrical conduction. In this work a new method for increasing the electrical-conductivity of TCO films and maintaining high optical transparency in solar modules by creating micron-sized metalized grooves in the substrate is presented. The grooves were machined into the glass substrate using a 266 nm pulsed UV laser and a relevant optical setup. Initial results show that ultra-fine gridlines down to 10 m width with fully metalized sidewalls can be achieved. This is a factor of ten smaller than the gridlines produced by screen-printing. This paper presents the procedures for masking, laser processing and metallization and analyzes the impact this technique would have on solar cell performance.