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<p>Inorganic CsPbI<sub>3</sub> perovskite, known for its high chemical stability and near-ideal bandgap, offers a promising solution to the instability of organic-inorganic hybrid perovskites that limit perovskite solar cells (PSCs) longevity. However, the conventional intermediate phase (dimethylammonium lead iodide, DMAPbI<sub>3</sub>) templating method suffers from inefficient phase conversion, hindering high-performance PSC development. To overcome this limitation, we engineered the crystallographic orientation of DMAPbI<sub>3</sub> to promote rapid volatilization of DMAI and accelerating the transformation. Through in situ anchoring of Pb<sup>2+</sup>-complexing groups (-F &lt; -Cl &lt; -SO<sub>4</sub>) on TiO<sub>2</sub> substrates during chemical bath deposition, we direct the preferential in-plane growth of Pb-rich (100) planes of DMAPbI<sub>3</sub>, enhancing its [100] orientation. Crucially, stronger complexing groups yield higher orientation degrees, accelerating thermal conversion into highly oriented CsPbI<sub>3</sub> perovskite with higher purity and better optoelectronic properties. This strategy enables carbon-based, hole-transport-layer-free CsPbI<sub>3</sub> PSCs to achieve a record 20.72% efficiency (certified as 20.35%). Unencapsulated device retains &gt; 85% of their initial efficiency after 1156 h of continuous maximum power point tracking under 1-sun illumination.</p>

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Directing intermediate phase crystallographic orientation promotes carbon-based CsPbI3 perovskite solar cells to beyond 20% efficiency

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Gaofeng Li,
  • Jieke Tan,
  • Changqing Lin,
  • Cheng Zhu,
  • Yujiang Du,
  • Zhou Li,
  • Shulin Chen,
  • Xiaozhen Wei,
  • Zhe Xing,
  • Yuzhe Wang,
  • Chunyu Lv,
  • Qixian Zhang,
  • Huicong Liu,
  • Weiping Li,
  • Yang Bai,
  • Shihe Yang,
  • Zedong Lin,
  • Zhike Liu,
  • Haining Chen

摘要

Inorganic CsPbI3 perovskite, known for its high chemical stability and near-ideal bandgap, offers a promising solution to the instability of organic-inorganic hybrid perovskites that limit perovskite solar cells (PSCs) longevity. However, the conventional intermediate phase (dimethylammonium lead iodide, DMAPbI3) templating method suffers from inefficient phase conversion, hindering high-performance PSC development. To overcome this limitation, we engineered the crystallographic orientation of DMAPbI3 to promote rapid volatilization of DMAI and accelerating the transformation. Through in situ anchoring of Pb2+-complexing groups (-F < -Cl < -SO4) on TiO2 substrates during chemical bath deposition, we direct the preferential in-plane growth of Pb-rich (100) planes of DMAPbI3, enhancing its [100] orientation. Crucially, stronger complexing groups yield higher orientation degrees, accelerating thermal conversion into highly oriented CsPbI3 perovskite with higher purity and better optoelectronic properties. This strategy enables carbon-based, hole-transport-layer-free CsPbI3 PSCs to achieve a record 20.72% efficiency (certified as 20.35%). Unencapsulated device retains > 85% of their initial efficiency after 1156 h of continuous maximum power point tracking under 1-sun illumination.