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  4. Impact of Local Back-Surface-Field Thickness Variation on Performance of PERC Solar Cells
 
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2021
Journal Article
Title

Impact of Local Back-Surface-Field Thickness Variation on Performance of PERC Solar Cells

Abstract
This article investigates the impact of the back-surface-field (BSF) thickness variation within a local aluminum contact on the performance of passivated emitter and rear contact solar cells. A significant difference of BSF thickness between contact endings and the center of dash-shaped contacts is verified experimentally by a comprehensive statistical analysis using scanning electron microscopy. The impact of local BSF thickness differences on the cell performance is studied with 3-D technology computer-aided design (TCAD) device simulations. Several device parameters such as BSF thicknesses, the doping concentration in the BSF profile at rear contacts, or the metallized area fraction at the cell rear side are varied. Our simulation study shows that the open-circuit voltage is mainly affected by locally reduced BSF thicknesses, resulting in an efficiency loss up to 0.14% abs or 0.84% abs , respectively, if an area fraction of 1% or 20% within a local contact has reduced BSF thicknesses. This effect can be minimized either by reducing the metallized area fraction at the cell rear side or by increasing the doping concentration in the BSF profile at aluminum rear contacts. In addition, we demonstrate that the 3-D simulations can be approximated with 2-D simulations by applying a single doping profile with an average BSF thickness, calculated with the harmonic mean.
Author(s)
Min, B.
Müller, M.
Wolpensinger, B.
Fischer, G.
Palinginis, Phedon
Neuhaus, Dirk Holger  
Brendel, Rolf
Journal
IEEE Journal of Photovoltaics  
DOI
10.1109/JPHOTOV.2021.3068603
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
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