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  4. Long-term stability of TOPCon solar cell precursor structures based on Ga-doped Cz-Si
 
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2024
Journal Article
Title

Long-term stability of TOPCon solar cell precursor structures based on Ga-doped Cz-Si

Abstract
In this study, the impact of tunnel oxide passivated contact (TOPCon) solar cell precursor structures on commercial Ga-doped Czochralski silicon is investigated regarding bulk- and surface-related degradation. Two sample types, symmetrical poly-Si structures and asymmetrical samples featuring various passivation stacks used in TOPCon cells are examined. It is found that firing temperatures well above 800 °C lead to blistering and a significant reduction in performance for symmetrical TOPCon structures, reducing iVOC to below 700 mV. Treatment at an elevated temperature under constant illumination revealed that a significant degradation could only be observed at measured firing peak temperatures above 750 °C. While it is found that an AlOx interlayer underneath a SiNy:H layer effectively reduces the extent of degradation without an (n)poly-Si layer, it seems to be less effective on top of (n)poly-Si layers. Another experiment on the long-term stability revealed that surface-related degradation (SRD) is significantly reduced by the usage of symmetrical TOPCon structures and for a sample passivated with an SiOz/AlOx/SiNy:H stack. Compared to reference samples processed without TOPCon structures, a notable reduction in the extent of light- and elevated temperature-induced degradation (LeTID) is achieved in the samples featuring TOPCon structures, which is due to less hydrogen in-diffusion from passivation layer stacks into the bulk during the firing process.
Author(s)
Kamphues, Joshua
Lison, Jessica
Polzin, Jana-Isabelle  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Wolf, Andreas  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Lossen, Jan
Herguth, Axel
Hahn, Giso
Geml, Fabian
Journal
Solar energy materials and solar cells  
Open Access
DOI
10.1016/j.solmat.2024.113156
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Excess carrier lifetime

  • Ga-doped silicon

  • Hydrogen

  • LeTID

  • TOPCon

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