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  4. POCl3-Based Emitter Diffusion Process with Lower Recombination Current Density and Homogeneous Sheet Resistance for Nanotextured Monocrystalline Silicon with atmospheric Pressure Dry Etching
 
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2020
Conference Paper
Title

POCl3-Based Emitter Diffusion Process with Lower Recombination Current Density and Homogeneous Sheet Resistance for Nanotextured Monocrystalline Silicon with atmospheric Pressure Dry Etching

Abstract
In this work, we investigate the emitter sheet resistance and emitter recombination current density by optimizing the POCl3emitter diffusion process parameters to achieve improved electrical properties and cell performance. Wafers used in the experiment were boron-doped p-type mono-crystalline silicon samples, nanotextured in an atmospheric pressure dry etching tool (ADE) producing highly textured surfaces and decreased surface reflection. Surface roughness is subsequently reduced by a short isotropic etch, to facilitate the surface passivation. The optimization of the diffusion process is realized by adjusting the phosphorus deposition temperature and its drive-in duration, resulting in decreased emitter saturation current density of ~100 fA/cm2 and in more homogeneous emitter sheet resistance of ~105 O/sq. Compared to the un-optimized diffusion process, it also leads to a decreased Auger recombination.
Author(s)
Khan, N.W.
Ridoy, Ahmed Ismail
Kafle, Bishal  
Klitzke, Malte
Schmidt, Stefan  
Clochard, Laurent
Wolf, Andreas  
Hofmann, Marc  
Rentsch, Jochen  
Mainwork
37th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2020  
Conference
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) 2020  
DOI
10.24406/publica-r-409572
10.4229/EUPVSEC20202020-2CV.1.45
File(s)
N-618171.pdf (1.66 MB)
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Photovoltaik

  • atmospheric pressure dry etch (ADE)

  • diffusion

  • homojunction

  • nanotexture

  • texturisation

  • Silicium-Photovoltaik

  • Oberflächen: Konditionierung

  • Passivierung

  • Lichteinfang

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