Michael Grätzel团队引入二维(2D)A2PbI4钙钛矿层,其使用五氟苯基乙基铵(FEA)作为氟代芳烃阳离子插入3D钙钛矿薄膜和空穴传输材料(HTM)之间。全氟化苯部分赋予间隔层超疏水特性,保护钙钛矿层免受环境湿气的影响,同时减轻器件中的离子扩散。未密封的3D/2D 钙钛矿太阳能电池在模拟阳光和潮湿空气中,保持90%的效率超过1000小时。而且,2D层还增强了界面空穴提取,抑制了非辐射载流子复合,并使其效率超过 22%,这是3D/2D结构最高值。
Ultrahydrophobic 3D/2D fluoroarene bilayer-based water-resistant perovskite solar cells with efficiencies exceeding 22%.
Science Advances
DOI: 10.1126/sciadv.aaw2543.
https://advances.sciencemag.org/content/5/6/eaaw2543