Flexible perovskite solar cells (PSCs) were ideal candidates for wearable devices due to the merits of flexibility, high efficiency, and being lightweight, and they could be fabricated in a continuous roll-to-roll production process to achieve large-area and low cost devices. Herein, the high efficiency (up to 18.53%) and fill factor (0.81) of flexible PSCs (ITO/SnO₂/KCl/MAPbI₃/spiro-OMeTAD/Ag) were achieved by low-pressure assisted solution processing under low temperature (⩽100 °C). The surface morphology and crystallinity of perovskite films were effectively promoted by the KCl modification and the defect density of perovskite films as well as the hysteresis of the corresponding devices was reduced accordingly. In addition, the stability and bendability of the KCl-modified flexible PSCs were improved simultaneously. To the best of our knowledge, both the efficiency and fill factor are the best among all flexible PSCs reported to date. Therefore, the insertion of KCl between SnO₂ and MAPbI₃ layers provided a promising strategy for highly efficient flexible PSCs fabricated in low temperature (⩽100 °C) conditions.

中文翻译：

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通过在SnO ₂和CH ₃ NH ₃ PbI ₃层之间插入氯化钾来实现高效率（18.53％）的柔性钙钛矿太阳能电池

柔性钙钛矿太阳能电池（PSC）具有柔韧性，高效率和重量轻的优点，是可穿戴设备的理想选择，它们可以通过连续的卷对卷生产工艺制造，以实现大面积和低成本设备。在此，柔性PSC（ITO / SnO ₂ / KCl / MAPbI ₃）的高效率（高达18.53％）和填充因子（0.81）/ spiro-OMeTAD / Ag）是通过在低温（⩽100°C）下进行低压辅助溶液处理而获得的。通过KCl改性有效地促进了钙钛矿薄膜的表面形貌和结晶度，并相应地降低了钙钛矿薄膜的缺陷密度以及相应器件的磁滞。另外，同时改善了KCl改性的柔性PSC的稳定性和可弯曲性。据我们所知，效率和填充因子均是迄今为止报告的所有灵活PSC中最好的。因此，在SnO ₂和MAPbI ₃层之间插入KCl为在低温（⩽100°C）条件下制造的高效柔性PSC提供了有希望的策略。