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<p>Enhancing light absorption in ultrathin silicon films remains a key challenge for improving the performance of next-generation optoelectronic and photovoltaic devices. In this work, we present a comprehensive simulation study of silicon thin films embedded with metallic nanoparticles, focusing on Ag, Au, and Cu inclusions with radii from 0.5 to 10&#xa0;nm and volume fractions between 0.01 and 0.2. The optical response of the nanocomposite films is modeled using a size-corrected Maxwell-Garnett-Mie effective medium framework, which incorporates nanoparticle scattering and absorption through Mie theory while retaining high computational efficiency. The resulting effective optical constants are used to calculate wavelength-dependent absorption, and the corresponding electrical performance is evaluated using the Shockley diode formalism. The validity of the effective medium approach is confirmed by direct comparison with full-wave finite-difference time-domain simulations, showing good agreement over a broad spectral range with only minor deviations in narrow wavelength regions. Systematic analysis reveals that nanoparticle size and volume fraction play a decisive role in governing absorption enhancement and power output, with ultrasmall nanoparticles (~ 1&#xa0;nm) consistently providing the most broadband absorption enhancement and yielding power improvements of up to 154% relative to undoped silicon films, largely independent of the metal species. These results establish the proposed effective medium framework as a reliable and efficient tool for optimizing nanoparticle-assisted light trapping in silicon-based optoelectronic devices.</p>

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Maxwell-Garnett-Mie-based modeling of optical absorption and photoelectric performance in silicon thin films embedded with metal nanoparticles

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Tran Gia Bach,
  • Ngo Xuan Dam,
  • Tran Minh Huy,
  • Nguyen Dang Manh,
  • Tran Duc Dong,
  • Duc Hai Tran,
  • Vu Dinh Lam,
  • Le Viet Cuong

摘要

Enhancing light absorption in ultrathin silicon films remains a key challenge for improving the performance of next-generation optoelectronic and photovoltaic devices. In this work, we present a comprehensive simulation study of silicon thin films embedded with metallic nanoparticles, focusing on Ag, Au, and Cu inclusions with radii from 0.5 to 10 nm and volume fractions between 0.01 and 0.2. The optical response of the nanocomposite films is modeled using a size-corrected Maxwell-Garnett-Mie effective medium framework, which incorporates nanoparticle scattering and absorption through Mie theory while retaining high computational efficiency. The resulting effective optical constants are used to calculate wavelength-dependent absorption, and the corresponding electrical performance is evaluated using the Shockley diode formalism. The validity of the effective medium approach is confirmed by direct comparison with full-wave finite-difference time-domain simulations, showing good agreement over a broad spectral range with only minor deviations in narrow wavelength regions. Systematic analysis reveals that nanoparticle size and volume fraction play a decisive role in governing absorption enhancement and power output, with ultrasmall nanoparticles (~ 1 nm) consistently providing the most broadband absorption enhancement and yielding power improvements of up to 154% relative to undoped silicon films, largely independent of the metal species. These results establish the proposed effective medium framework as a reliable and efficient tool for optimizing nanoparticle-assisted light trapping in silicon-based optoelectronic devices.