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<p>In this research, nanographene thin films were deposited on soda-lime glass using pulsed laser deposition (PLD) without a catalyst at a low substrate temperature of 200&#xa0;°C, making the method efficient and cost-effective for MSM photodetector applications. The effect of different laser pulse counts on the structural and optical properties was systematically studied. Adding additional layers reduced the energy gap, indicating modifications in the films electrical structure. FTIR analysis showed functional peaks of OH, C = C, and C–O, which confirmed that the surface had oxidized. Raman spectroscopy showed a decrease in the I₂<sub>D</sub>/I<sub>G</sub> ratio from 7.95 (G19) to 4.93 (G22) and a reduction in I<sub>D</sub>/I<sub>G</sub> to 0.5231, indicating improved crystal quality with increasing thickness. XRD confirmed that the overall structure was amorphous and that the main orientation stayed the same. FESEM showed that the grains grew almost uniformly. EDS analysis indicated carbon content increased from 92 to 97% across samples, and AFM confirmed smooth surfaces with suitable roughness for photonic applications. The fabricated photodetectors exhibited broadband responsiveness, with device sensitivity improving with higher laser pulses.The photodetector exhibited a maximum photoresponsivity of 7.8 mA/W and a detectivity of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(3.14\times {10}^{13}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>3.14</mn> <mo>×</mo> <msup> <mrow> <mn>10</mn> </mrow> <mn>13</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> Jones, with a rise time of 0.3291 ms and a fall time of 0.3284 ms, demonstrating the effectiveness of the PLD-deposited graphene films for high-performance photodetection applications.</p>

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Pulsed laser deposition of nano-graphene for high-performance photodetector applications

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Mohammed M. Abdelrahman,
  • Sabah A. Salman,
  • A. Kadhim

摘要

In this research, nanographene thin films were deposited on soda-lime glass using pulsed laser deposition (PLD) without a catalyst at a low substrate temperature of 200 °C, making the method efficient and cost-effective for MSM photodetector applications. The effect of different laser pulse counts on the structural and optical properties was systematically studied. Adding additional layers reduced the energy gap, indicating modifications in the films electrical structure. FTIR analysis showed functional peaks of OH, C = C, and C–O, which confirmed that the surface had oxidized. Raman spectroscopy showed a decrease in the I₂D/IG ratio from 7.95 (G19) to 4.93 (G22) and a reduction in ID/IG to 0.5231, indicating improved crystal quality with increasing thickness. XRD confirmed that the overall structure was amorphous and that the main orientation stayed the same. FESEM showed that the grains grew almost uniformly. EDS analysis indicated carbon content increased from 92 to 97% across samples, and AFM confirmed smooth surfaces with suitable roughness for photonic applications. The fabricated photodetectors exhibited broadband responsiveness, with device sensitivity improving with higher laser pulses.The photodetector exhibited a maximum photoresponsivity of 7.8 mA/W and a detectivity of \(3.14\times {10}^{13}\) 3.14 × 10 13  Jones, with a rise time of 0.3291 ms and a fall time of 0.3284 ms, demonstrating the effectiveness of the PLD-deposited graphene films for high-performance photodetection applications.