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<p>The persistent photoconductivity (PPC) behavior in composite nanocrystalline films ZnO(RF)/Si(DC) films grown by co-sputtering was studied. The studied films were produced by fixing the ZnO RF magnetron power at 120 Watts and varying the DC power for the Si target from 0 to 80 Watts. The produced films were structural, optical, and electrical characterized; n-type films were produced for all the composition range. The PPC behavior was studied in samples grown with the composition formed with the ZnO (RF = 120 W)/Si (DC = 20 W) power condition, and by exposing the sample surfaces under continuous or pulsed ultraviolet (UV) radiation (390–400&#xa0;nm). After applying an extended cleansing period, the PPC characteristic time constants, τ.<sub>63</sub>,&#xa0;were obtained;&#xa0;the turn-off time constant varied from 16.8 to 22.8&#xa0;s, while the turn-on time constant changed from 24 to 30&#xa0;s. These periods are linked to the UV light lattice absorption and the corresponding energy relaxation mechanisms.</p> Graphical abstract <p></p>

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Analysis of the persistent photoconductivity in composite nanocrystalline ZnO/Si films produced by co-sputtering at room temperature

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月9日

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  • Jonathan Ortiz Vázquez,
  • Gabriel Romero Paredes Rubio,
  • Miguel Galván Arellano,
  • Erick Ismael Castro Ontiveros,
  • Ramón Peña Sierra

摘要

The persistent photoconductivity (PPC) behavior in composite nanocrystalline films ZnO(RF)/Si(DC) films grown by co-sputtering was studied. The studied films were produced by fixing the ZnO RF magnetron power at 120 Watts and varying the DC power for the Si target from 0 to 80 Watts. The produced films were structural, optical, and electrical characterized; n-type films were produced for all the composition range. The PPC behavior was studied in samples grown with the composition formed with the ZnO (RF = 120 W)/Si (DC = 20 W) power condition, and by exposing the sample surfaces under continuous or pulsed ultraviolet (UV) radiation (390–400 nm). After applying an extended cleansing period, the PPC characteristic time constants, τ.63, were obtained; the turn-off time constant varied from 16.8 to 22.8 s, while the turn-on time constant changed from 24 to 30 s. These periods are linked to the UV light lattice absorption and the corresponding energy relaxation mechanisms.

Graphical abstract