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Facile Fabrication of PbS Nanocrystal:C60 Fullerite Broadband Photodetectors with High Detectivity

Authors

  • Rinku Saran,

    1. Advanced Technology Institute, Department of Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK
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  • Muhammad N. Nordin,

    1. Advanced Technology Institute, Department of Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK
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  • Richard J. Curry

    Corresponding author
    1. Advanced Technology Institute, Department of Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK
    • Advanced Technology Institute, Department of Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK.
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Abstract

Hybrid PbS nanocrystal/C60 fullerite photodetectors are fabricated using a simple one-step drop casting procedure onto pre-patterned interdigitated electrodes. The devices exhibit a broad spectral response from the near UV through to the near infrared yielding a detectivity, D*, of above 1010 Jones from 400 nm to ≈1050 nm. The ability to further extend the spectral response to wavelengths ≈1350 nm in the near infrared via tuning of the PbS nanocrystal diameter is also demonstrated. The dynamic responses of the devices are presented, exhibiting a fast photocurrent rise time (<40 ns) followed by a long bi-exponential decay with characteristic lifetimes of τ1 = 5.3 μs ± 0.1 μs and τ2 = 37.8 μs ± 0.7 μs. These devices, which have a detectivity approaching that of commercial detectors, a broader spectral response, and a fast rise time, offer an attractive low-cost solution for large-area broadband photodetectors.

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