The search for Pb‐free perovskite materials continues with limited success to find a suitable replacement for Pb with outstanding optoelectronic properties. Herein, Pb‐free inorganic halide perovskite Cs₂PtI₆ with excellent absorption coefficient, long minority carrier lifetime, and optical bandgap of 1.4 eV is reported. Atmospheric precursor‐based solution processing results in high‐quality Cs₂PtI₆ with absorption coefficient of $4\times {10}^5{\text{\hspace{0.17em}cm}}^{-1}$ for photon energies of >1.5 eV and high minority carrier lifetimes of >2 μs indicating low defect density in the material. Superstrate n–i–p solar cells processed with the structure F:SnO₂/CdS/Cs₂PtI₆/carbon/Cu show promising device efficiency of 13.88%. These planar devices processed under atmospheric conditions show low V_oc deficit (<0.3 V) without any hysteresis in forward and reverse scans indicating low trap densities. Pt offers an excellent model system for the replacement of Pb due to high atomic number, oxidation resistance, and stability. Cs₂PtI₆ is an atmospherically stable phase under AM1.5G at 65 °C for 1000 h.

中文翻译：

---

空气稳定，高效，基于铂的卤化物钙钛矿太阳能电池，具有较长的使用寿命

继续寻找无铅钙钛矿材料的努力取得了有限的成功，找到了具有出色光电性能的铅替代品。在此，据报道，无铅无机卤化物钙钛矿Cs ₂ PtI ₆具有出色的吸收系数，长的少数载流子寿命和1.4 eV的光学带隙。基于大气前体的溶液处理可产生高质量的Cs ₂ PtI ₆，吸收系数为$4\times {10}^5{\text{\hspace{0.17em}厘米}}^{-\mathrm{1个}}$对于大于1.5 eV的光子能量和大于2μs的高少数载流子寿命，表明材料中的缺陷密度低。用F：SnO ₂ / CdS / Cs ₂ PtI ₆ /碳/ Cu结构处理的上层n–i–p太阳能电池显示出13.88％的器件效率。在大气条件下处理的这些平面器件显示出低的V _oc缺陷（<0.3 V），并且在正向和反向扫描中均没有滞后现象，表明陷阱密度低。由于原子序数高，抗氧化性和稳定性高，Pt提供了一个出色的模型系统来替代Pb。Cs ₂ PtI ₆是在AM1.5G下于65°C放置1000 h的大气稳定相。