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<p>Inverted perovskite solar cells (pero-SCs)&#xa0;utilizing nickel oxide (NiO<sub>x</sub>)/self-assembled monolayer (SAM) as a hole transport layer (HTL) have demonstrated high power conversion efficiency (PCE). However, variations in the valence states of NiO<sub>x</sub> on the surface create complexity in the growth of a high-quality SAM HTL. To address these challenges, a new SAM molecule MeOF-4SHCz is synthesized and utilized to target the Ni<sup>3+</sup>-rich regions on the NiO<sub>x</sub> substrate. A redox reaction occurs at the interface&#xa0;and the oxidation product of MeOF-4SHCz forms a new S−O−Ni&#xa0;bonding at the Ni<sup>3+</sup>-rich regions. The application of the&#xa0;combined SAMs of MeOF-4SHCz and the regular SAM&#xa0;MeOF-4PACz can improve the overall coverage and uniformity of the&#xa0;SAM layer on NiO<sub>x</sub>. As a result, the optimized inverted pero-SCs based on this redox-improved (ROI)-SAM HTL of MeOF-4SHCz/MeOF-4PACz = 4:1 (w/w) achieve a high PCE of 26.5% (certified as&#xa0;26.28%) and improved stability with T<sub>90</sub> &gt; 1000 hours.</p>

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Redox-Improved Self-Assembled Monolayers for Inverted Perovskite Solar Cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月12日

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  • Meng Yuan,
  • Yiyang Wang,
  • Zhe Liu,
  • Jinyuan Zhang,
  • Shucheng Qin,
  • Minchao Liu,
  • Zekun Chen,
  • Yao Zhao,
  • Jing Li,
  • Xiaojun Li,
  • Lei Meng,
  • Yongfang Li

摘要

Inverted perovskite solar cells (pero-SCs) utilizing nickel oxide (NiOx)/self-assembled monolayer (SAM) as a hole transport layer (HTL) have demonstrated high power conversion efficiency (PCE). However, variations in the valence states of NiOx on the surface create complexity in the growth of a high-quality SAM HTL. To address these challenges, a new SAM molecule MeOF-4SHCz is synthesized and utilized to target the Ni3+-rich regions on the NiOx substrate. A redox reaction occurs at the interface and the oxidation product of MeOF-4SHCz forms a new S−O−Ni bonding at the Ni3+-rich regions. The application of the combined SAMs of MeOF-4SHCz and the regular SAM MeOF-4PACz can improve the overall coverage and uniformity of the SAM layer on NiOx. As a result, the optimized inverted pero-SCs based on this redox-improved (ROI)-SAM HTL of MeOF-4SHCz/MeOF-4PACz = 4:1 (w/w) achieve a high PCE of 26.5% (certified as 26.28%) and improved stability with T90 > 1000 hours.