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Development of Full-Area Passivating Contacts for Solar Cells Application

by David Tröger
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Current price ₹4,733.00
Original price ₹5,479.00
Original price ₹5,479.00
Original price ₹5,479.00
(-14%)
₹4,733.00
Current price ₹4,733.00

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Book cover type: Paperback
  • ISBN13: 9783695728763
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Bod - Books on Demand
  • Publisher Imprint: Bod - Books on Demand
  • Publication Date:
  • Pages: 194
  • Original Price: USD 55.9
  • Language: German
  • Edition: 1. Auflage
  • Item Weight: 236 grams
  • BISAC Subject(s): General

The state-of-the-art PERC solar cell is passivated with Al2O3 or H: SiNx. these dielectrics must be opened locally to extract the generated photo current by a direct metal-semiconductor contact. These contacts induce a high density of interface states, known for increasing the surface recombination velocity and decreasing the solar cell efficiency. To circumvent the direct metal-semiconductor contact, this thesis investigates a cell concept, which based on a full-area passivation by Al2O3 or H: SiNx without local openings. On the one hand, such a passivating and non-conductive dielectric has to be thin enough to extract the photo current with lowest possible ohmic losses. On the other hand, the passivation has to suppress the charge carrier recombination at the Si/dielectric interface as much as possible. With respect to these criteria, Al2O3 and H: SiNx layers were deposited with optimized process parameters. In conjunction with these passivation layers, also a transparent conductive oxide was developed, which enables a certain carrier selectivity to extract just one type of charge carriers, i.e. electrons or holes. This study focuses on the development of TiOx as electron-selective contact and NiO or WOx as contact. The deposited contacts are examined with respect to their structural, electrical and optical properties. The findings are used to form an optimized full-area carrier selective contact. Both, the thin passivation layers and the carrier selective contact, are combined to form a full-area passivating contact for p-doped as well as for n-doped Si. The developed full-area contacts exhibit the potential to replace the typical metal-semiconductor contacts in state-of-the-art PERC solar cells.

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