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  4. Interdigitated back contact silicon solar cells featuring ion-implanted poly-Si/SiOx passivating contacts
 
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2017
Conference Paper
Title

Interdigitated back contact silicon solar cells featuring ion-implanted poly-Si/SiOx passivating contacts

Abstract
Interdigitated back contact (IBC) silicon solar cells featuring passivating contacts based on tunneling oxides (SiOx) and n- and p-type polycrystalline silicon (poly-Si) thin films were fabricated with different rear side configurations to show the impact of the recombination in the transition region between p-type and n-type poly-Si on the performance of the solar cells. On the one hand a) p+ and n+ poly-Si regions were in direct contact to each other (""no gap"") using a local overcompensation (counterdoping) as a self-aligning process and on the other hand b) undoped (intrinsic) poly-Si remained between the p+ and n+ poly-Si regions (""gap""). These configurations were investigated in terms of recombination characteristics by illumination- and injection-dependent quasi-steady state photoluminescence (suns-PL) and were compared to solar cells that featured c) etched trenches separating the p+ and n+ poly-Si regions (""trench""). While the latter configuration allowed for open-circuit voltages (Voc) of 720 mV, fill factor (FF) of 79.6%, and short-circuit current (Jsc) of 41.3 mA/cm2, resulting in conversion efficiencies () of 23.7%, solar cells without a trench showed a poor performance due to non-ideal recombination in the space charge regions with high local ideality factors as well as recombination in shunted regions. Therefore, Voc of only 593 mV and FF of only 61.3% were achieved for the ""no gap"" configuration whereas for the ""gap"" configuration higher Voc of 680 mV but also low FF of 65.6% were obtained.
Author(s)
Reichel, Christian  
Müller, Ralph  
Feldmann, Frank
Richter, Armin  
Hermle, Martin  
Glunz, Stefan W.  
Mainwork
33rd European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2017  
Conference
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) 2017  
File(s)
N-477461.pdf (495.52 KB)
DOI
10.24406/publica-r-399261
10.4229/EUPVSEC20172017-2DO.2.5
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Solarzellen - Entwicklung und Charakterisierung

  • Photovoltaik

  • Silicium-Photovoltaik

  • Herstellung und Analyse von hocheffizienten Solarzellen

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