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<p>Double perovskites, such as Cs<sub>2</sub>AgBiBr<sub>6</sub>, offer a promising alternative to conventional toxic photovoltaics but face challenges of low efficiency and instability. A novel strategy to enhance both efficiency and stability is demonstrated through the incorporation of 15% FAPbBr<sub>3</sub> and FAPbI<sub>3</sub> into the Cs<sub>2</sub>AgBiBr<sub>6</sub> matrix, creating a strain-compensated heterostructure. Structural analysis (XRD) confirms enlarged grain size (33 nm vs. 27 nm) Cs<sub>2</sub>AgBiBr<sub>6</sub> + FAPbBr<sub>3</sub>, enhancing charge transport and crystallinity. Optical studies reveal a tailored bandgap (E<sub>g</sub>) (1.87 eV vs. 1.92 eV), broader spectral absorption, and a higher refractive index (<i>n</i> = 2.76), enabling efficient light trapping and reduced recombination. Dielectric properties and impedance spectroscopy further validate suppressed interfacial recombination and improved charge storage. These enhancements culminate in a record 4.95% power conversion efficiency (PCE) for Cs<sub>2</sub>AgBiBr<sub>6</sub> + FAPbBr<sub>3</sub>, with higher short circuit current (J<sub>sc</sub> = 7.14 mA-cm⁻<sup>2</sup>), Open Circuit Voltage (V<sub>oc</sub> = 0.90 V), and fill factor (FF = 0.77). By balancing eco-friendly design with high performance, this work advances non-toxic perovskite solar cells toward commercial viability, offering a scalable pathway for sustainable photovoltaics.</p> Graphical Abstract <p></p>

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Hybrid interface engineering for Cs2AgBiBr6 double perovskite solar cells using FAPbBr3 and FAPbI3 additives

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • M. Naziruddin Khan,
  • Ihtisham-ul-haq,
  • M. I. Khan,
  • Ibrahim A. Shaaban

摘要

Double perovskites, such as Cs2AgBiBr6, offer a promising alternative to conventional toxic photovoltaics but face challenges of low efficiency and instability. A novel strategy to enhance both efficiency and stability is demonstrated through the incorporation of 15% FAPbBr3 and FAPbI3 into the Cs2AgBiBr6 matrix, creating a strain-compensated heterostructure. Structural analysis (XRD) confirms enlarged grain size (33 nm vs. 27 nm) Cs2AgBiBr6 + FAPbBr3, enhancing charge transport and crystallinity. Optical studies reveal a tailored bandgap (Eg) (1.87 eV vs. 1.92 eV), broader spectral absorption, and a higher refractive index (n = 2.76), enabling efficient light trapping and reduced recombination. Dielectric properties and impedance spectroscopy further validate suppressed interfacial recombination and improved charge storage. These enhancements culminate in a record 4.95% power conversion efficiency (PCE) for Cs2AgBiBr6 + FAPbBr3, with higher short circuit current (Jsc = 7.14 mA-cm⁻2), Open Circuit Voltage (Voc = 0.90 V), and fill factor (FF = 0.77). By balancing eco-friendly design with high performance, this work advances non-toxic perovskite solar cells toward commercial viability, offering a scalable pathway for sustainable photovoltaics.

Graphical Abstract