Experimental discrimination of geminate versus non-geminate recombination in a-Si:H

ORAL

Abstract

Hydrogenated amorphous silicon (a-Si:H) is an important material for solar cells, thin film transistors, and other devices. An open fundamental question in a-Si:H is which excess charge carrier recombination processes are geminate (correlated) or non-geminate (non-correlated). While both mechanisms cause photoluminescence (PL), only non-geminate recombination impacts photocurrent (PC). To answer this question, we have conducted pulsed Optically and Electrically Detected Magnetic Resonance (pODMR and pEDMR) spectroscopy on a-Si:H. The results allow an assignment of non-geminate and geminate processes to various previously known recombination mechanisms.

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Authors

  • Sang -Yun Lee

    • Department of Physics and Astronomy, University of Utah, USA
    • Department of Physics and Astronomy, University of Utah

  • Thomas Herring

    • Department of Physics and Astronomy, University of Utah, USA

  • Dane McCamey

    • Department of Physics and Astronomy, University of Utah, USA

  • Craig Taylor

    • Colorado School of Mines, Department of Physics, USA

  • Klaus Lips

    • Helmholtz-Zentrum Berlin fuer Materialien und Energie, Abteilung Silizium-Photovoltaik, Germany

  • Jian Hu

    • MV Systems, Inc., USA

  • Feng Zhu

    • MV Systems, Inc., USA

  • Arun Madan

    • MV Systems, Inc., USA

  • Christoph Boehme

    • Department of Physics and Astronomy, University of Utah, USA