Certified power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have increased to an impressive value of 22.1%. The most efficient perovskite solar cells have the n–i–p device architecture and use 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) as the hole transport material (HTM). However, there exists microscopic inhomogeneity that is detrimental to the long-term performance of the solar cells, primarily as a result of the hygroscopicity of the lithium bis((trifluomethyl)sulfonyl)amide (LiTFSI) dopant. Here, we report a strategy for reducing heterogeneity by using an organic–inorganic integrated hole transport layer (HTL) composed of the solution-processable conjugated polymer FBT-Th4 and copper oxide (Cu_xO). The optimized PSCs show significant performance enhancement with power conversion efficiency up to 18.85% from a reverse voltage scan and a stabilized champion efficiency of 18.24% with negligible hysteresis. Moreover, we observe a significant enhancement of the long-term stability of perovskite solar cells under a high humidity of 70–80% in air.

中文翻译：

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集成的有机-无机空穴传输层，可实现高效，稳定的钙钛矿太阳能电池†

钙钛矿太阳能电池（PSC）的认证功率转换效率（PCE）已提高到令人印象深刻的22.1％。效率最高的钙钛矿太阳能电池具有n–i–p器件架构，并使用2,2'，7,7'-四（N，N'-二-对甲氧基苯胺）-9,9'-螺双芴（spiro- OMeTAD）作为空穴传输材料（HTM）。然而，存在主要由于双（（三氟甲基）磺酰基）酰胺锂（LiTFSI）掺杂剂的吸湿性而对太阳能电池的长期性能有害的微观不均匀性。在这里，我们报告了一种通过使用可溶液处理的共轭聚合物FBT-Th4和氧化铜（Cu）组成的有机-无机集成空穴传输层（HTL）来减少异质性的策略_x O）。经过优化的PSC表现出显着的性能提升，反向电压扫描的功率转换效率高达18.85％，磁滞可以忽略不计，稳定的冠军效率为18.24％。此外，我们观察到在空气中70-80％的高湿度下，钙钛矿太阳能电池的长期稳定性有了显着提高。