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<p>Monolithic perovskite/perovskite/silicon triple-junction solar cells offer higher theoretical efficiency than their two-junction counterparts. However, the phase instability of ultrawide-bandgap perovskites remains a major obstacle to further improve the efficiency and stability of triple-junction devices. Here, we introduce 1,4-phenylenediamine dihydriodide into the 1.93-eV bandgap perovskite, which significantly increases the ion migration barrier and suppresses phase segregation through strong interactions with the perovskite lattice. Combined with a post-treatment using 3-(methylthio)propylamine hydroiodide to modify the perovskite surface, we achieved a certified efficiency of 26.18% for the triple-junction solar cell, with an impressive open-circuit voltage of 3.148 V on an aperture area of 1.17 cm². Notably, the encapsulated devices retained 96% of their initial performance after 1500 hours of continuous maximum power point tracking under one-sun illumination in ambient conditions, representing the notable stability in perovskite/perovskite/silicon triple-junction cells reported to date.</p>

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Stabilizing 1.93-eV ultrawide-bandgap perovskites for efficient triple-junction solar cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Wenchi Kong,
  • Xinrui Han,
  • Haowen Luo,
  • Bowen Yang,
  • Jiajia Suo,
  • Yifeng Ren,
  • Ruiyan Li,
  • Dandan Yan,
  • Yuxuan Liu,
  • Jin Wen,
  • Jiajia Hong,
  • Xuntian Zheng,
  • Henan Feng,
  • Lu Zhao,
  • Zijing Chu,
  • Renxing Lin,
  • Yu Deng,
  • Hairen Tan

摘要

Monolithic perovskite/perovskite/silicon triple-junction solar cells offer higher theoretical efficiency than their two-junction counterparts. However, the phase instability of ultrawide-bandgap perovskites remains a major obstacle to further improve the efficiency and stability of triple-junction devices. Here, we introduce 1,4-phenylenediamine dihydriodide into the 1.93-eV bandgap perovskite, which significantly increases the ion migration barrier and suppresses phase segregation through strong interactions with the perovskite lattice. Combined with a post-treatment using 3-(methylthio)propylamine hydroiodide to modify the perovskite surface, we achieved a certified efficiency of 26.18% for the triple-junction solar cell, with an impressive open-circuit voltage of 3.148 V on an aperture area of 1.17 cm². Notably, the encapsulated devices retained 96% of their initial performance after 1500 hours of continuous maximum power point tracking under one-sun illumination in ambient conditions, representing the notable stability in perovskite/perovskite/silicon triple-junction cells reported to date.