Interfacial engineering is crucial for perovskite solar cells (PSCs) to ensure efficient charge carrier transfer, and pivotal for device performances. Herein, a novel cross‐linked PCBM (CL‐PCBM) interlayer at the perovskite/electron transport layer (ETL) interface of the methylammonium‐free PSC device is incorporated. The dimeric PCBM interlayer prepared using a facile UV cross‐linking technique concurrently improves the quality of the resultant perovskite film and the charge transfer capability of the ETL, leading to significantly enhanced device photovoltaic performances. In addition, the PSC devices integrating the CL‐PCBM interlayers exhibit superior humidity and UV stabilities. The successful employment of the CL‐PCBM interlayer can bring new insight into the design and engineering of high‐quality interfaces for efficient PSCs.

中文翻译：

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交联的PCBM中间层，用于高效且不含紫外线的无甲基铵钙钛矿型太阳能电池

界面工程对于钙钛矿太阳能电池（PSC）至关重要，以确保有效的载流子传输，并且对于器件性能至关重要。在此，在无甲铵PSC设备的钙钛矿/电子传输层（ETL）界面处加入了一种新型的交联PCBM（CL-PCBM）中间层。使用简便的UV交联技术制备的二聚PCBM中间层可同时提高所得钙钛矿薄膜的质量和ETL的电荷转移能力，从而显着提高器件的光伏性能。此外，集成了CL‐PCBM中间层的PSC器件还具有出色的湿度和紫外线稳定性。CL‐PCBM中间层的成功使用可以为高效PSC的高质量接口的设计和工程带来新的见解。