Near-infrared photodetection in n-type nanocrystalline FeSi 2/p-type Si heterojunctions

Nathaporn Promros, Li Chen, Tsuyoshi Yoshitake

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    14 Citations (Scopus)


    n-Type nanocrystalline (NC) FeSi2/p-type Si heterojunctions, which were prepared by pulsed laser deposition, were evaluated as a near infrared photodiode. The built-in potential was estimated to be approximately 1.1 eV from the capacitance-voltage measurement. These junctions showed a rectifying behavior accompanied by a large leakage current. The near infrared light detection performance was evaluated using a 1.33 μm laser in the temperature range of 77-300 K. At a reverse bias of -5 V, the detectivity was 5.5 × 107 cm Hz1/2 W-1 at 300 K and it was dramatically enhanced to be 8.0 × 1010 cm Hz1/2 W-1 at 77 K. It was demonstrated that NC-FeSi2 is a new potential material applicable to NIR photodetectors operating at low temperatures.

    Original languageEnglish
    Pages (from-to)3577-3581
    Number of pages5
    JournalJournal of nanoscience and nanotechnology
    Issue number5
    Publication statusPublished - May 2013

    All Science Journal Classification (ASJC) codes

    • Bioengineering
    • Chemistry(all)
    • Biomedical Engineering
    • Materials Science(all)
    • Condensed Matter Physics


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