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White Grid Fingers for Short Circuit Current Gain in Modules
L. Hamann, G.C. Gläser, L. Prönneke, J.H. Werner
White Painted Fingers, Module Optimization/Optimisation, Reduce Optical Losses
Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Subtopic: New Materials, Cells and Modules
Event: 26th European Photovoltaic Solar Energy Conference and Exhibition
Session: 1DV.2.30
487 - 491
ISBN: 3-936338-27-2
Paper DOI: 10.4229/26thEUPVSEC2011-1DV.2.30
0,00 EUR
Document(s): paper


White colored grid fingers reduce the optical width of the fingers which leads to a gain in short circuit current density Jsc = 0.6 %rel. Incoming rays are reflected at the white painted fingers instead of being absorbed at the metallic surface. The reflected rays are totally internally reflected at the glass air interface of the module with a probability of approx. 50% and have another chance to reach the active cell area. White grid fingers reduce the optical width of the shadowed area in solar modules without increasing the series resistance. Optimizing the size of the white painted contact fingers, leading to an optical width half as large as the real width of the fingers achieves a simulated gain in short circuit current density Jsc = 3 %.