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Carrier Recombination Times in Amorphous-Silicon Doping Superlattices

Martin Hundhausen, L. Ley, R. Carius

Open publisher page 82 citations

Abstract

Doping superlattices, i.e., multilayer structures consisting of ultrathin ($50 \AA{}<~d<~400 \AA{}$) $n$-type, intrinsic, and $p$-type layers of $a$-Si: H (nipi structures), have been produced. Up to a tenfold increase in their infrared photoconductivity after band-gap illumination compared to unstructured $a$-Si: H is observed. The results are well described by a simple model for the carrier recombination kinetics that takes into account the spatial separation of electrons and holes due to the modulation of the band energies.

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Doping superlattices, i.e., multilayer structures consisting of ultrathin ($50 \AA{}<~d<~400 \AA{}$) $n$-type, intrinsic, and $p$-type layers of $a$-Si: H (nipi structures), have been produced. Up to a tenfold increase in their infrared photoconductivity after band-gap illumination compared to unstructured $a$-Si: H is observed. The results are well described by a simple model for the carrier recombination kinetics that takes into account the spatial separation of electrons and holes due to the modulation of the band energies.

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Available abstract

Doping superlattices, i.e., multilayer structures consisting of ultrathin ($50 \AA{}<~d<~400 \AA{}$) $n$-type, intrinsic, and $p$-type layers of $a$-Si: H (nipi structures), have been produced. Up to a tenfold increase in their infrared photoconductivity after band-gap illumination compared to unstructured $a$-Si: H is observed. The results are well described by a simple model for the carrier recombination kinetics that takes into account the spatial separation of electrons and holes due to the modulation of the band energies.

Key concepts: Superlattice, Photoconductivity, Doping, Recombination, Materials science, Amorphous silicon, Silicon, Band gap

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