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Alkylthiol coordination-hydrophobic synergy for high-performance perovskite solar cells
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DOI：10.1016/j.solener.2026.115010.png)
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Abstract
En 中文
• Alkylthiols realize chain-length-dependent dual synergy: short chains coordinate Pb²⁺ for defect passivation, long chains build hydrophobic barriers to synchronously upgrade PSC efficiency and stability. • Short-chain EDT realizes bidentate chelation via optimal ∼2.5 Å −SH spacing, delivering 21.30% reverse-scan PCE, ∼90% EQE peak and markedly suppressed device hysteresis. • Long-chain DDT forms a reliable hydrophobic layer; unencapsulated PSCs retain >70% original efficiency after 1080 h at 80% RH (25–35 °C) with superior thermal and photostability. • Alkylthiols boost Spiro-OMeTAD p-type doping, raising conductivity to 10.19×10⁻³ S/cm, eliminating film pinholes and reducing surface roughness to 4–6 nm. • Priced below $0.02/g with simple fabrication and high reproducibility, the additive offers an economical path for industrializing Spiro-OMeTAD-based PSCs.
Keywords:
Spiro-OMeTAD
Organic alkyl thiols
Perovskite solar cells
Stability
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6.6
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1.4W
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6.2W
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