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<p>The tunable band structure and the ability to convert ultraviolet light (UV) photons into measurable electrical signals without an external power supply make the nano-scale spinel structure of nickel cobaltite (NiCo<sub>2</sub>O<sub>4</sub>; SNC) an attractive ternary metal oxide semiconductor for use as a UV light photodetector (UPD). In this paper, the SNC was prepared using a simple, one-step hydrothermal method and characterized by various analytical techniques. I-V characteristics were comprehensively studied over a range of -5 to + 5&#xa0;V to evaluate the dependence of the net current in an SNC-based UPD (UNC) on the variations in temperature, bias voltage, and power density (P<sub>D</sub>) of 365&#xa0;nm-UV light. It was found that the device exhibits diode-like characteristics with acceptable photoresponse behaviors. This device not only demonstrated a modified Richardson constant of 22.85&#xa0;A.cm<sup>− 2</sup>.K<sup>− 2</sup> but also exhibited a high contrast ratio and significant short-circuit current at 0&#xa0;V, indicating its self-powered nature. The UNC exposed photoresponsivity of 0.88&#xa0;A/W, detectivity of 10.75 × 10<sup>10</sup> Jones, external quantum efficiency of 299.4%, and normalized Gain dynamic range of 419.9&#xa0;W<sup>− 1</sup> at the P<sub>D</sub> of 2.2 mW/cm<sup>2</sup>. Moreover, it revealed a rise time of 3.6&#xa0;s, and a high maximum photocurrent of 21.2 µA at P<sub>D</sub> of 79.6 mW/cm<sup>2</sup>. In conclusion, the present study demonstrates a substantial advancement in the design of a low-cost, self-powered, reliable, and long-term stable optoelectronic device with the ability to detect wide range of P<sub>D</sub>s for 365&#xa0;nm-UV light.</p> Graphical abstract <p></p>

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A self-powered ultraviolet photodetector based on nickel cobaltite spinel microspheres assembled from nanoparticles

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Fatemeh Sarouzeh Rostami,
  • Shahruz Nasirian,
  • Seyedeh Somayeh Naghibi

摘要

The tunable band structure and the ability to convert ultraviolet light (UV) photons into measurable electrical signals without an external power supply make the nano-scale spinel structure of nickel cobaltite (NiCo2O4; SNC) an attractive ternary metal oxide semiconductor for use as a UV light photodetector (UPD). In this paper, the SNC was prepared using a simple, one-step hydrothermal method and characterized by various analytical techniques. I-V characteristics were comprehensively studied over a range of -5 to + 5 V to evaluate the dependence of the net current in an SNC-based UPD (UNC) on the variations in temperature, bias voltage, and power density (PD) of 365 nm-UV light. It was found that the device exhibits diode-like characteristics with acceptable photoresponse behaviors. This device not only demonstrated a modified Richardson constant of 22.85 A.cm− 2.K− 2 but also exhibited a high contrast ratio and significant short-circuit current at 0 V, indicating its self-powered nature. The UNC exposed photoresponsivity of 0.88 A/W, detectivity of 10.75 × 1010 Jones, external quantum efficiency of 299.4%, and normalized Gain dynamic range of 419.9 W− 1 at the PD of 2.2 mW/cm2. Moreover, it revealed a rise time of 3.6 s, and a high maximum photocurrent of 21.2 µA at PD of 79.6 mW/cm2. In conclusion, the present study demonstrates a substantial advancement in the design of a low-cost, self-powered, reliable, and long-term stable optoelectronic device with the ability to detect wide range of PDs for 365 nm-UV light.

Graphical abstract