Record-High Responsivity and High Detectivity Broadband Photodetectors Based on Upconversion/Gold/Prussian-Blue Nanocomposite

Akash Gupta; Dinesh Kumar Patel; Song Yeul LeeAlbert F. RigosiRandolph E. ElmquistVenkata N. K. B. AdusumalliChi-Te LiangYong Il Park

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Record-High Responsivity and High Detectivity Broadband Photodetectors Based on Upconversion/Gold/Prussian-Blue Nanocomposite

机译：Record-High Responsivity and High Detectivity Broadband Photodetectors Based on Upconversion/Gold/Prussian-Blue Nanocomposite

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The development of high-quality and strongly Au conjugated upconversion nanoparticles (UCNPs) is time-consuming and requires specific chemicals. Therefore, a one-pot hydrothermal method is adopted for novel in situ preparation of UCNP@Au composites using a binary functional ethylenediaminetetraacetic salt, which is employed as a surfactant and reducing agent. The composites are electrostatically conjugated with metal-coordinated Prussian blue (PB) to yield UCNP@Au+PB nanocomposites (NCs), which demonstrate 21-fold upconversion emission quenching by fluorescence resonance energy transfer compared to UCNPs. Additionally, the PB, UCNP@Au, and NCs demonstrate a synergistically reduced trap (α ≈ 0.85) and enhance ultrasensitive broadband (432-980 nm) photodetection. The NCs-based gate-free epitaxial graphene device demonstrates excellent high photoresponsivity (5.9 × 10~5 A W~(-1)), detectivity (2.17 × 10~(14) cm H_Z~(1/2)W~(-1)), and normalized gain (2.06 × 10~(?4) m~2 V~(-1)) at 318 nW cm~(-2) (532 nm) and a bias voltage of 1 V. The Au plasmons enhance the one-photon-enabled visible absorption of Er~(3+) ions, and PB exhibits broad absorption and enhances the carrier density of the device, resulting in an ultrahigh photoresponse. The obtained device performance is the highest to date among their class of nanohybrids. Also, these NCs can readily detect polychromatic light and signals from daily-use appliances, indicating their potential for applications in consumer electronics.

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《Advanced functional materials》 |2022年第44期|2206496.1-2206496.13|共13页
作者
Akash Gupta; Dinesh Kumar Patel; Song Yeul LeeAlbert F. RigosiRandolph E. ElmquistVenkata N. K. B. AdusumalliChi-Te LiangYong Il Park;
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作者单位

School of Chemical Engineering Chonnam National University Gwangju 61186, South Korea;

Department of Physics National Taiwan University Taipei 106319, Taiwan,Physical Measurement Laboratory National Institute of Standards and Technology (NIST) Gaithersburg, MD 20899, USA,Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100 D-38116, B;

Physical Measurement Laboratory National Institute of Standards and Technology (NIST) Gaithersburg, MD 20899, USADepartment of Physics National Taiwan University Taipei 106319, Taiwan;

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Au plasmonics; broadband photodetectors; in situ syntheses; Prussian blue; upconversion nanoparticles;

Record-High Responsivity and High Detectivity Broadband Photodetectors Based on Upconversion/Gold/Prussian-Blue Nanocomposite

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