We investigated strontium oxide (SrO) as an interlayer material to enhance the UV stability of a CH₃NH₃PbI₃ perovskite solar cell. Moisture and over 400 nm wavelength of light were excluded to investigate the effect of UV light only. Two different interlayer fabrication processes were examined to optimize the performance of this solar cell. Devices fabricated by dipping for 30 min in SrO solution exhibited photoconversion efficiencies of 15.5%, whereas those fabricated with 60-min dipping showed photoconversion efficiencies of 15% and exhibited local Sr agglomeration. Devices with SrO displayed lower initial efficiencies than those without any SrO layer (17.6%), However, a device without SrO retained only 34.4% of its initial efficiency after 100 h of UV exposure. In contrast, SrO-incorporated devices retained almost 60.0% of their initial efficiency. Severe μ-PL mapping intensity degradation was observed in devices that did not include the interlayer, but no degradation was observed in those with the SrO interlayer. This can be attributed to the passivation of the degradation sites by SrO.

我们研究了氧化锶（SrO）作为中间层材料以增强CH ₃ NH ₃ PbI ₃的紫外线稳定性钙钛矿太阳能电池。排除湿气和超过400 nm波长的光仅用于研究紫外线的影响。研究了两种不同的中间层制造工艺，以优化该太阳能电池的性能。通过在SrO溶液中浸泡30分钟制造的器件显示出15.5％的光转换效率，而通过60分钟浸渍制造的那些器件显示出15％的光转换效率并显示出局部Sr团聚。具有SrO的设备显示的初始效率比没有任何SrO层的设备低（17.6％）。但是，没有SrO的设备在暴露100 h的紫外线后仅保留其初始效率的34.4％。相反，掺入SrO的设备保留了其初始效率的近60.0％。在不包括中间层的设备中，μ-PL映射强度严重下降，但是在具有SrO夹层的那些中没有观察到降解。这可以归因于SrO对降解位点的钝化。