Lightweight flexible perovskite solar cells are promising for building integrated photovoltaics, wearable electronics, portable energy systems and aerospace applications. However, their highest certified efficiency of 19.9% lags behind their rigid counterparts (highest 25.7%), mainly due to defective interfaces at charge-selective contacts with perovskites on top. Here we use a mixture of two hole-selective molecules based on carbazole cores and phosphonic acid anchoring groups to form a self-assembled monolayer and bridge perovskite with a low temperature-processed NiO nanocrystal film. The hole-selective contact mitigates interfacial recombination and facilitates hole extraction. We show flexible all-perovskite tandem solar cells with an efficiency of 24.7% (certified 24.4%), outperforming all types of flexible thin-film solar cell. We also report 23.5% efficiency for larger device areas of 1.05 cm². The molecule-bridged interfaces enable significant bending durability of flexible all-perovskite tandem solar cells that retain their initial performance after 10,000 cycles of bending at a radius of 15 mm.

轻质柔性钙钛矿太阳能电池有望用于构建集成光伏、可穿戴电子设备、便携式能源系统和航空航天应用。然而，它们的最高认证效率为 19.9%，落后于刚性同类产品（最高 25.7%），这主要是由于顶部与钙钛矿的电荷选择性接触处有缺陷的界面。在这里，我们使用基于咔唑核和膦酸锚定基团的两种空穴选择性分子的混合物，形成具有低温处理的 NiO 纳米晶体薄膜的自组装单层和桥接钙钛矿。空穴选择性接触减轻了界面复合并促进了空穴提取。我们展示了效率为 24.7%（认证为 24.4%）的柔性全钙钛矿串联太阳能电池，其性能优于所有类型的柔性薄膜太阳能电池。² . 分子桥接界面使柔性全钙钛矿串联太阳能电池具有显着的弯曲耐久性，该电池在半径为 15 mm 的 10,000 次弯曲循环后仍保持其初始性能。