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Bifacial Solar Cells with Boron Back Surface Field
C. Duran, T. Buck, R. Kopecek, J. Libal, F. Traverso
Bifacial, Module, Albedo
Wafer-Based Silicon Solar Cells and Materials Technology
Subtopic: Mono- and Multicrystalline Silicon Materials and Cells
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 2CV.3.77
2348 - 2352
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-2CV.3.77
0,00 EUR
Document(s): paper


The purpose of this work is to demonstrate an alternative process to a standard Al-full side device which can be used for thin wafers. One way to do so is to process a passivated boron diffused rear side with an open rear contact. The cell processed in this way has a better passivation on the rear and in addition is bi-facial allowing light penetrating through the rear, increasing the power output. Most of the process steps have been optimized. With this process sequence we established a homogeneous set of bifacial solar cells on Cz-Si material with similar characteristics and efficiencies up to 17.3% under front side illumination. In order to assemble and build high power output modules it is important to have similar short circuit currents in each bifacial solar cell. From a fifty cells batch we obtained an average short circuit current of 35.4 [mA/cm2], constructing with these a 4x4 cells mini module for testing. Test results show that the reflecting light can increase the power output of the module from 8% for grass reflecting surface up to 19% for a high reflectance surface.