Bromide-based hybrid perovskites are of particular interest not only due to the fact that they offer a way to go beyond the Shockley–Queisser limit via the tandem cell scheme but single-junction devices of them can also achieve reasonably high efficiency with high stability for solar energy conversion. However, the highest power conversion efficiency achieved up to now for FAPbBr₃ single-junction solar cells is only 8.2%, which is far below the efficiency of ∼17% predicted from detailed balance analysis. Here, a two-step method (the intermolecule exchange pathway) was systematically optimized for the fabrication of high-quality FAPbBr₃ films. A molecule of urea, structurally similar to formamidinium, is introduced as an additive to tune the intermolecular ion exchange procedure. SnO₂ is introduced as an electron-selective contact to the planar structured FAPbBr₃ solar cells. As a result, a power conversion efficiency of 10.61% and a V_oc of 1.56 V are achieved with planar structured solar cells, both of which represent the highest value ever reported for FAPbBr₃ solar cells.

中文翻译：

---

功率转换效率高于10％的平面FAPbBr ₃太阳能电池

基于溴化物的混合钙钛矿不仅引起人们的兴趣，不仅因为它们提供了一种通过串联电池方案超越肖克利-奎塞尔极限的方法，而且它们的单结器件还可以实现合理的高效率和高稳定性，太阳能转换。但是，到目前为止，FAPbBr ₃单结太阳能电池实现的最高功率转换效率仅为8.2％，远低于详细的平衡分析预测的约17％的效率。在这里，系统地优化了两步法（分子间交换路径）以制造高质量的FAPbBr ₃膜。在结构上类似于甲ami的尿素分子被引入作为添加剂来调节分子间离子交换过程。锡_将图2作为电子选择性接触引入到平面结构的FAPbBr ₃太阳能电池中。结果，采用平面结构的太阳能电池可实现10.61％的功率转换效率和1.56 V的V _oc，这两者均代表了FAPbBr ₃太阳能电池有史以来的最高值。