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<p>The instability of hybrid wide-bandgap (WBG) perovskite materials (with bandgap larger than 1.68 eV) still stands out as a major constraint for the commercialization of perovskite/silicon tandem photovoltaics, yet its correlation with the facet properties of WBG perovskites has not been revealed. Herein, we combine experiments and theoretical calculations to comprehensively understand the facet-dependent instability of WBG perovskites. We find that the (111) facet, which owned higher ion-migration activation energy and lower diffusion constant, endured instability better than the (100) facet in multi-component 1.68 eV perovskites under electron beam or light irradiations, where excess charge carriers facilitate halide migrations and thereafter phase segregations. By introducing trioctylphosphine oxide into the WBG perovskite, a strong oriented growth of the (111) facet for the WBG perovskite film was realized which exhibited enhanced operational stability against light illumination. The fabricated one square centimeter area perovskite/silicon tandems with n-i-p and p-i-n configurations deliver efficiencies of 28.03 % and 30.78 % (certified 30.26 %), respectively, with both configurations exhibiting excellent operational stability at the maximum power point (MPP) with <i>T</i><sub>95</sub> &gt; 1000 h.</p>

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Oriented wide-bandgap perovskites for monolithic silicon-based tandems with over 1000 hours operational stability

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月2日

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  • Yuxin Yao,
  • Biao Li,
  • Degong Ding,
  • Chenxia Kan,
  • Pengjie Hang,
  • Daoyong Zhang,
  • Zechen Hu,
  • Zhenyi Ni,
  • Xuegong Yu,
  • Deren Yang

摘要

The instability of hybrid wide-bandgap (WBG) perovskite materials (with bandgap larger than 1.68 eV) still stands out as a major constraint for the commercialization of perovskite/silicon tandem photovoltaics, yet its correlation with the facet properties of WBG perovskites has not been revealed. Herein, we combine experiments and theoretical calculations to comprehensively understand the facet-dependent instability of WBG perovskites. We find that the (111) facet, which owned higher ion-migration activation energy and lower diffusion constant, endured instability better than the (100) facet in multi-component 1.68 eV perovskites under electron beam or light irradiations, where excess charge carriers facilitate halide migrations and thereafter phase segregations. By introducing trioctylphosphine oxide into the WBG perovskite, a strong oriented growth of the (111) facet for the WBG perovskite film was realized which exhibited enhanced operational stability against light illumination. The fabricated one square centimeter area perovskite/silicon tandems with n-i-p and p-i-n configurations deliver efficiencies of 28.03 % and 30.78 % (certified 30.26 %), respectively, with both configurations exhibiting excellent operational stability at the maximum power point (MPP) with T95 > 1000 h.