Hydrogenation of Dislocation-Limited Heteroepitaxial Silicon Solar Cells: Preprint

    Research output: Contribution to conferencePaper


    Post-deposition hydrogenation by remote plasma significantly improves performance of heteroepitaxial silicon solar cells. Heteroepitaxial deposition of thin crystal silicon on sapphire for photovoltaics (PV) is an excellent model system for the study and improvement of deposition on inexpensive Al2O3-coated (100) biaxially-textured metal foils. Without hydrogenation, PV conversion efficienciesare less than 1% on our model system. Performance is limited by carrier recombination at electrically active dislocations that result from lattice mismatch, and other defects. We find that low-temperature hydrogenation at 350 degrees C is more effective than hydrogenation at 610 degrees C. In this work, we use measurements such as spectral quantum efficiency, secondary ion mass spectrometry(SIMS), and vibrational Si-H spectroscopies to understand the effects of hydrogenation on the materials and devices. Quantum efficiency increases most at red and green wavelengths, indicating hydrogenation is affecting the bulk more than the surface of the cells. SIMS shows there are 100X more hydrogen atoms in our cells than dangling bonds along dislocations. Yet, Raman spectroscopy indicatesthat only low temperature hydrogenation creates Si-H bonds; trapped hydrogen does not stably passivate dangling-bond recombination sites at high temperatures.
    Original languageAmerican English
    Number of pages7
    StatePublished - 2012
    Event2012 IEEE Photovoltaic Specialists Conference - Austin, Texas
    Duration: 3 Jun 20128 Jun 2012


    Conference2012 IEEE Photovoltaic Specialists Conference
    CityAustin, Texas

    NREL Publication Number

    • NREL/CP-5200-54101


    • epitaxial silicon
    • heteroepitaxy
    • hydrogen
    • solar cells


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