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<p>The interfacial contact between NiO<sub>x</sub> and self-assembled monolayers (SAMs) in wide-bandgap (WBG) subcells limits the efficiency and stability of all-perovskite tandem solar cells (TSCs). The strongly acidic phosphoric acid (PA) anchors in common PA-SAMs corrode reactive NiO<sub>x</sub>, undermining device stability. Moreover, SAM aggregation leads to interfacial losses and significant open-circuit voltage (V<sub>OC</sub>) deficits. Here, we introduce boric acid (BA) as a milder anchoring group that chemisorbs onto NiO<sub>x</sub> via strong –<InlineEquation ID="IEq03"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41467_2025_59515_Article_IEq03.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">\({{\rm{BO}}}_2{\mbox{-}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mi mathvariant="normal">BO</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> <mstyle> <mtext>-</mtext> </mstyle> </math></EquationSource> </InlineEquation> –Ni coordination. A benzothiophene-fused head group enhances interfacial bonding through S–Ni orbital interactions, yielding higher binding energy than PA-SAMs. This design also promotes homogeneous SAM formation without aggregation. Resultantly, the WBG cell exhibits an improved PCE to 20.1%. When integrated with narrow bandgap (NBG) subcell, the two-terminal (2T) TSCs achieve an ameliorative PCE of 28.5% and maintain 90% of the initial PCE after maximum power point tracking (MPP) under 1 sun illumination for 500 h.</p>

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Less-acidic boric acid-functionalized self-assembled monolayer for mitigating NiOx corrosion for efficient all-perovskite tandem solar cells

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  • 发表日期：

    2025年5月4日

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  • Jingnan Wang,
  • Boxin Jiao,
  • Ruijia Tian,
  • Kexuan Sun,
  • Yuanyuan Meng,
  • Yang Bai,
  • Xiaoyi Lu,
  • Bin Han,
  • Ming Yang,
  • Yaohua Wang,
  • Shujing Zhou,
  • Haibin Pan,
  • Zhenhuan Song,
  • Chuanxiao Xiao,
  • Chang Liu,
  • Ziyi Ge

摘要

The interfacial contact between NiOx and self-assembled monolayers (SAMs) in wide-bandgap (WBG) subcells limits the efficiency and stability of all-perovskite tandem solar cells (TSCs). The strongly acidic phosphoric acid (PA) anchors in common PA-SAMs corrode reactive NiOx, undermining device stability. Moreover, SAM aggregation leads to interfacial losses and significant open-circuit voltage (VOC) deficits. Here, we introduce boric acid (BA) as a milder anchoring group that chemisorbs onto NiOx via strong – \({{\rm{BO}}}_2{\mbox{-}}\) BO 2 - –Ni coordination. A benzothiophene-fused head group enhances interfacial bonding through S–Ni orbital interactions, yielding higher binding energy than PA-SAMs. This design also promotes homogeneous SAM formation without aggregation. Resultantly, the WBG cell exhibits an improved PCE to 20.1%. When integrated with narrow bandgap (NBG) subcell, the two-terminal (2T) TSCs achieve an ameliorative PCE of 28.5% and maintain 90% of the initial PCE after maximum power point tracking (MPP) under 1 sun illumination for 500 h.