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Record-Efficiency Flexible Perovskite Solar Cells Enabled by Multifunctional Organic Ions Interface Passivation.

Lu YangJiangshan FengZhike LiuYuwei DuanSheng ZhanShaomin YangKun HeYong LiYawei ZhouNingyi YuanJianning DingShengzhong Frank Liu
Published in: Advanced materials (Deerfield Beach, Fla.) (2022)
Flexible perovskite solar cells (f-PSCs) have attracted great attention because of their unique advantages in lightweight and portable electronics applications. However, their efficiencies are far inferior to those of their rigid counterparts. Herein, a novel histamine diiodate (HADI) is designed based on theoretical study to modify the SnO 2 /perovskite interface. Systematic experimental results reveal that the HADI serves effectively as a multifunctional agent mainly in three aspects: 1) surface modification to realign the SnO 2 conduction band upward to improve interfacial charge extraction; 2) passivating the buried perovskite surface, and 3) bridging between the SnO 2 and perovskite layers for effective charge transfer. Consequently, the rigid MA-free PSCs based on the HADI-SnO 2 electron transport layer (ETL) display not only a high champion power conversion efficiency (PCE) of 24.79% and open-circuit voltage (V OC ) of 1.20 V but also outstanding stability as demonstrated by the PSCs preserving 91% of their initial efficiencies after being exposed to ambient atmosphere for 1200 h without any encapsulation. Furthermore, the solution-processed HADI-SnO 2 ETL formed at low temperature (100 °C) is utilized in f-PSCs that achieve a PCE as high as 22.44%, the highest reported PCE for f-PSCs to date.
Keyphrases
  • perovskite solar cells
  • solar cells
  • room temperature
  • drug delivery
  • high efficiency
  • air pollution
  • cancer therapy
  • minimally invasive
  • particulate matter
  • working memory
  • gene expression
  • single cell
  • water soluble