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<p>Broadband photodetectors simplify multiband sensing by eliminating the need for complex integration of multiple narrow-band devices. Polyoxometalates (POMs), known for their excellent electronic properties and redox activity, enhance this functionality by promoting efficient charge transport and light absorption. In this study, we synthesized a Dawson-type germanium-doped polyoxometalate to explore its photodetection capabilities across the UV–Vis–NIR spectrum. The compound was thoroughly characterized using <sup>31</sup>P NMR, FT-IR, UV–Vis spectroscopy, cyclic-voltage (C-V) profiling, SEM, EDX, TEM, and AFM analyses. The fabricated device demonstrated a notable rectification ratio of 1383.62. Under solar illumination, it achieved a minimum noise equivalent power (NEP) of 1.2 × 10<sup>–12</sup>&#xa0;WHz<sup>−1/2</sup> and a high detectivity of 7.42 × 10<sup>10</sup>&#xa0;Jones. Its performance was further evaluated across wavelengths from 351 to 1600&#xa0;nm without applying external bias, highlighting its potential as a self-powered photodetector. At 1000&#xa0;nm (6.8&#xa0;mW/cm<sup>2</sup>), the device exhibited a responsivity of 22.49&#xa0;mA/W and a detectivity of 1.46 × 10<sup>10</sup>&#xa0;Jones, confirming its suitability for broadband, self-powered UV–Vis–NIR photodetection applications.</p>

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High-performance polyoxometalate/p-Si photodetector enabling bias-free detection across the visible–NIR spectrum

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月18日

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  • Ali Akbar Hussaini,
  • Yasemin Torlak,
  • Sümeyra Büyükçelebi,
  • Mehmet Hakan Çolpan,
  • Mahmut Kus,
  • Murat Yıldırım

摘要

Broadband photodetectors simplify multiband sensing by eliminating the need for complex integration of multiple narrow-band devices. Polyoxometalates (POMs), known for their excellent electronic properties and redox activity, enhance this functionality by promoting efficient charge transport and light absorption. In this study, we synthesized a Dawson-type germanium-doped polyoxometalate to explore its photodetection capabilities across the UV–Vis–NIR spectrum. The compound was thoroughly characterized using 31P NMR, FT-IR, UV–Vis spectroscopy, cyclic-voltage (C-V) profiling, SEM, EDX, TEM, and AFM analyses. The fabricated device demonstrated a notable rectification ratio of 1383.62. Under solar illumination, it achieved a minimum noise equivalent power (NEP) of 1.2 × 10–12 WHz−1/2 and a high detectivity of 7.42 × 1010 Jones. Its performance was further evaluated across wavelengths from 351 to 1600 nm without applying external bias, highlighting its potential as a self-powered photodetector. At 1000 nm (6.8 mW/cm2), the device exhibited a responsivity of 22.49 mA/W and a detectivity of 1.46 × 1010 Jones, confirming its suitability for broadband, self-powered UV–Vis–NIR photodetection applications.