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Front Dicing Technique for Pre-Isolation of Concentrator Silicon Solar Cells
K. Drew, L.M. Brown, A. Cole, K. Heasman, T. Bruton
Buried Contacts, Laser Processing, Concentrator Cell/s
Advanced Photovoltaics: New Concepts and Ultra-high Efficiency
Subtopic: Terrestrial Concentrator Systems
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 1DV.5.28
941 - 945
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-1DV.5.28
0,00 EUR
Document(s): paper


Silicon solar cells for concentrator applications tend to be small in size due to the use of light focusing optics and minimization of material usage. As cells become smaller, isolation of cells at their edges therefore becomes relatively more important in terms of both accuracy and cell performance. A novel isolation technique designed to address these issues is presented, and demonstrated with LGBC cells (Laser Grooved Buried Contacts) manufactured in the Narec pilot production line. As concentration is increased, cells with our Front Dicing Technique (FDT) increasingly outperform cells having our standard isolation thanks to gains in VOC and FF. Internal Quantum Efficiency (IQE) remains high at short wavelengths and is improved in the long wavelength region. There is no net increase in the number of processing steps and no additional resource consumption, therefore providing an easily implemented route to reducing cost per Watt.