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<p>In this study, the structural, optical, and electrical properties of undoped and manganese-doped copper oxide (CuO) nanoparticles were synthesized by the solution process sol–gel method. X-ray diffraction (XRD) analysis revealed a monoclinic crystal structure of developed nanomaterials. Morphological changes in Mn-doped CuO nanoparticles were observed using scanning electron microscopy (SEM). The band gap was found to decrease significantly from 1.59 to 1.47&#xa0;eV. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of Cu–O bonds within the synthesized nanoparticles. The semiconduction nature of the nanomaterials was confirmed by impedance spectroscopy. The developed nanomaterials can be modeled as a resistance–capacitance circuit with a series resistance of 31&#xa0;Ω. The heterojunction photodiode of Mn-doped CuO and ZnO was fabricated for future application of light detection. The responsivity and detectivity of CuO and Cu<sub>0.92</sub>Mn<sub>0.08</sub>O with ZnO hetrojunctions increase from 8.23 to 16.86&#xa0;mA/W and 0.72 to 2.75 × 10<sup>10</sup>&#xa0;Jones, respectively. This increase of photodiode parameters at higher Mn doping may be attributed to better energy-level alignment with ZnO. Overall, these studies demonstrated that the heterojunction of manganese-doped copper oxide and ZnO thin films forms promising energy-level alignments and interfaces for photodetection applications.</p>

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Enhanced photoresponse in Mn-doped CuO/ZnO heterojunction photodiodes

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • Megha Rana,
  • Ankur Rana,
  • Riya Malik,
  • Suraj P. Khanna,
  • R. Srivastava,
  • C. K. Suman

摘要

In this study, the structural, optical, and electrical properties of undoped and manganese-doped copper oxide (CuO) nanoparticles were synthesized by the solution process sol–gel method. X-ray diffraction (XRD) analysis revealed a monoclinic crystal structure of developed nanomaterials. Morphological changes in Mn-doped CuO nanoparticles were observed using scanning electron microscopy (SEM). The band gap was found to decrease significantly from 1.59 to 1.47 eV. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of Cu–O bonds within the synthesized nanoparticles. The semiconduction nature of the nanomaterials was confirmed by impedance spectroscopy. The developed nanomaterials can be modeled as a resistance–capacitance circuit with a series resistance of 31 Ω. The heterojunction photodiode of Mn-doped CuO and ZnO was fabricated for future application of light detection. The responsivity and detectivity of CuO and Cu0.92Mn0.08O with ZnO hetrojunctions increase from 8.23 to 16.86 mA/W and 0.72 to 2.75 × 1010 Jones, respectively. This increase of photodiode parameters at higher Mn doping may be attributed to better energy-level alignment with ZnO. Overall, these studies demonstrated that the heterojunction of manganese-doped copper oxide and ZnO thin films forms promising energy-level alignments and interfaces for photodetection applications.