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<p>Hybrid heterojunction solar cells based on poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) and silicon (Si) have attracted considerable interest due to their potential for high efficiency, low-cost materials, and facile fabrication. However, their performance is often limited by suboptimal spectral management and interfacial recombination. In this study, we present an optimized dual-layer PEDOT: PSS (PH1000) architecture, incorporating ethylene glycol (EG) and dimethyl sulfoxide (DMSO) dopants in films with thicknesses of ≥ 110&#xa0;nm and ≥ 60&#xa0;nm, respectively. This bilayer configuration enhances light absorption, reduces Fresnel reflection, and improves charge extraction through tailored interfacial engineering. The resulting device demonstrates reduced Fresnel reflection, significant increase in <i>V</i><sub>oc</sub> and <i>J</i><sub>sc</sub> due to the customized PEDOT: PSS architecture owing to improved charge extraction and reduced recombination losses. The device with dual-layer PEDOT: PSS film exhibits a significantly higher <i>V</i><sub>oc</sub> of 604.8 m<i>V</i> and <i>J</i><sub>sc</sub> of 16.57&#xa0;mA/cm<sup>2</sup> without any additional adaptations. Additionally, it has a fill factor of 61.03% with a 55.06% increase in PCE compared to that of a single-layer device. These findings underscore the effectiveness of dual-layer PEDOT: PSS structures in improving built-in potential and charge transport, offering a scalable pathway toward high-performance PEDOT: PSS/Si solar cells fabricated under ambient conditions. This study provides valuable insights into the effective employment of PEDOT: PSS hole transport layer to improve spectral management, enhance built-in potential and precise interface engineering strategies for refining charge transport across the device.</p>

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Tailored spectral management in PEDOT: PSS-based organic-Si heterojunction solar cells via dual-layer architecture for enhanced charge extraction and optical optimization

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Sami Iqbal,
  • Yi Yang,
  • Dan Su,
  • Zongru Yang,
  • Xinli Guo,
  • Tong Zhang

摘要

Hybrid heterojunction solar cells based on poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) and silicon (Si) have attracted considerable interest due to their potential for high efficiency, low-cost materials, and facile fabrication. However, their performance is often limited by suboptimal spectral management and interfacial recombination. In this study, we present an optimized dual-layer PEDOT: PSS (PH1000) architecture, incorporating ethylene glycol (EG) and dimethyl sulfoxide (DMSO) dopants in films with thicknesses of ≥ 110 nm and ≥ 60 nm, respectively. This bilayer configuration enhances light absorption, reduces Fresnel reflection, and improves charge extraction through tailored interfacial engineering. The resulting device demonstrates reduced Fresnel reflection, significant increase in Voc and Jsc due to the customized PEDOT: PSS architecture owing to improved charge extraction and reduced recombination losses. The device with dual-layer PEDOT: PSS film exhibits a significantly higher Voc of 604.8 mV and Jsc of 16.57 mA/cm2 without any additional adaptations. Additionally, it has a fill factor of 61.03% with a 55.06% increase in PCE compared to that of a single-layer device. These findings underscore the effectiveness of dual-layer PEDOT: PSS structures in improving built-in potential and charge transport, offering a scalable pathway toward high-performance PEDOT: PSS/Si solar cells fabricated under ambient conditions. This study provides valuable insights into the effective employment of PEDOT: PSS hole transport layer to improve spectral management, enhance built-in potential and precise interface engineering strategies for refining charge transport across the device.