Study of screen printed metallization for polysilicon based passivating contacts

Hande E. Çiftpinar, Maciej K. Stodolny, Yu Wu, Gaby J.M. Janssen, Jochen Löffler, Jurriaan Schmitz, Martijn Lenes, Jan Marc Luchies, Bart L.J. Geerligs

    Research output: Contribution to journalArticleAcademicpeer-review

    24 Citations (Scopus)
    383 Downloads (Pure)

    Abstract

    We investigate contacting of n- and p-type polysilicon (polySi) passivating contact layers with industrial screen-printed metal pastes, examining both fire through (FT) and non-fire through (NFT) pastes. The n- and p-type polySi layers, deposited by low pressure chemical vapour deposition and doped by POCl3 diffusion, phosphorus implant, or BBr3 diffusion, result in excellent Jo, even for 50 nm thickness (<2 fA/cm2 for n-polySi, <10 fA/cm2 for p-polySi). The contact recombination is investigated by photoluminescence, and by cell test structures to determine Voc as a function of metallization fraction. The contact resistance is investigated by transfer length method (TLM). The contacts are also extensively studied by high resolution electron microscopy. All-polySi solar cells (i.e., cells with front and back carrier selective layers consisting of polySi) are prepared. Excellent implied Voc values of nearly 730 mV and 710 mV are obtained on the un-metallized polished and textured cells, respectively. The contact recombination after applying screen printed metallization can be analyzed well with both methods (PL and Voc-based) rendering values for the prefactor of the recombination current Jo,c at the contact areas of about 400 and 350 fA/cm2 for 200 nm thick n-polySi and p-polySi, respectively.

    Original languageEnglish
    Pages (from-to)851-861
    Number of pages11
    JournalEnergy procedia
    Volume124
    DOIs
    Publication statusPublished - 2017
    Event7th International Conference on Silicon Photovoltaics, SiliconPV 2017 - Freiburg, Germany
    Duration: 3 Apr 20175 Apr 2017
    Conference number: 7
    http://2017.siliconpv.com/home.html

    Keywords

    • carrier selective contact
    • contact recombination
    • contact resistance
    • fire through metallization
    • passivating contact
    • polySi
    • polysilicon

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