Recombination centers resulting from reactions of hydrogen and oxygen in n-type Czochralski silicon

V. P. Markevich, M. Vaqueiro Contreras, J. Mullins, M. Halsall, B. Hamilton, L. I. Murin, R. Falster, J. Binns, E. Good, J. Coutinho, J. Medford, C. L. Reynolds, A. R. Peaker

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Hydrogen is often present in silicon solar cell fabrication introduced, for example, from silicon nitride anti-reflection layers. In general this has an important beneficial effect in reducing surface recombination. In this paper we show that in n-type Czochralski material the hydrogen reacts with interstitial oxygen related defects to form powerful recombination centers which reduce the minority carrier lifetime in the silicon region into which the hydrogen has diffused. We have studied electronic grade silicon and solar silicon grown by continuous Czochralski techniques. Hydrogen has been introduced into the silicon by wet etching, remote hydrogen plasma and from silicon nitride films. DLTS, MCTS and Laplace DLTS have been used to characterize and quantify parameters of the recombination centers and microwave photoconductivity decay to measure the minority carrier lifetime. The dominant recombination center has an acceptor level at 0.36 eV from the valence band. This center anneals out in the range 150 to 200°C but reforms on cooling.

    Original languageEnglish
    Title of host publication2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
    PublisherIEEE
    Pages1-6
    Number of pages6
    ISBN (Electronic)9781509056057
    DOIs
    Publication statusPublished - 2016
    Event44th IEEE Photovoltaic Specialist Conference, PVSC 2017 - Washington, United States
    Duration: 25 Jun 201730 Jun 2017

    Conference

    Conference44th IEEE Photovoltaic Specialist Conference, PVSC 2017
    Country/TerritoryUnited States
    CityWashington
    Period25/06/1730/06/17

    Keywords

    • Carrier lifetime
    • Czochralski silicon
    • DLTS
    • Hydrogen oxygen recombination centers
    • Photovoltaic cells

    Research Beacons, Institutes and Platforms

    • Photon Science Institute
    • National Graphene Institute

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