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  4. PERC-like Si Bottom Solar Cells for Industrial Perovskite-Si Tandem Solar Cells
 
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2022
Conference Paper
Title

PERC-like Si Bottom Solar Cells for Industrial Perovskite-Si Tandem Solar Cells

Abstract
This work aims for the development of an industrially feasible Si bottom cell for two-terminal perovskite/Si tandem solar cells. A tunnel oxide and poly-Si based passivating front contact (TOPCon) as a replacement of the phosphorus diffused emitter is investigated to upgrade the industrial PERC technology to tandem bottom solar cells (TOPerc). It is shown that TOPCon is compatible with the temperature budget needed for alloying of the local Al rear contact and provides excellent passivation of the planar surface (iVoc > 720 mV). Different possible process routes and fundamental design constraints like the necessity of a hydrogenation step and a single-sided oxide removal after contact firing were investigated. In a proof-of-concept device low contact resistivity (Uc) and high passivation quality could be transferred from test structures to solar cells. The high open-circuit voltage (Voc) of 691 mV and the low series resistance (Rs) of 0.7:cm2 of such a TOPerc solar cell with TCO interconnection layer highlight the potential of the proposed cell structure.
Author(s)
Luderer, Christoph
Fraunhofer-Institut für Solare Energiesysteme ISE  
Nagel, Henning  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Feldmann, Frank
Goldschmidt, Jan Christoph  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Bivour, Martin  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Hermle, Martin  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Mainwork
SiliconPV 2021, 11th International Conference on Crystalline Silicon Photovoltaics  
Conference
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) 2021  
DOI
10.1063/5.0097026
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Electrical properties and parameters

  • Semiconductor material

  • Hydrogenation process

  • Solar cells

  • Perovskites

  • Budget

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