Achieving optimal interfacial contact and band alignment at the buried interface of perovskites is crucial for minimizing the energy loss in perovskite solar cells (PSCs). Herein, a series of fluorine-substituted succinic acid derivatives are rationally introduced into the bottom interface of a perovskite. Tetrafluorosuccinic acid (TFSA), with its symmetric molecular structure and strong electronegativity, has been proven to be the best interfacial regulator among the selected functional molecules. TFSA not only effectively stabilizes FA cations via multi-site hydrogen-bonding, but also passivates under-coordinated Pb²⁺ defects through coordination effects. Moreover, TFSA finely regulates the morphological arrangement and homogenizes the surface contact potential of MeO-2PACz, resulting in the formation of high-quality perovskite films with reduced interfacial charge transport barriers and suppressed non-radiative recombination. Consequently, an exceptional efficiency of 25.92% (certified 25.77%) was achieved for a 0.09 cm² inverted device, along with a voltage loss of 0.36 V and excellent long-term operational stability, representing the highest value reported for inverted PSCs based on RbCsFAMA-based perovskites to date. Additionally, a 12.96 cm² (active area) minimodule delivers an impressive efficiency of 22.78%, demonstrating great upscaling potential. This study opens an effective strategy to rationally regulate the buried interfacial energy loss towards highly efficient and stable inverted PSCs.

中文翻译：

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使用氟取代小分子最大限度地减少掩埋界面能量损失，实现效率 25.92% 的稳定倒置钙钛矿太阳能电池


在钙钛矿埋入界面处实现最佳界面接触和能带排列对于最大限度地减少钙钛矿太阳能电池（PSC）的能量损失至关重要。在此，一系列氟取代的琥珀酸衍生物被合理地引入到钙钛矿的底部界面中。四氟琥珀酸（TFSA）以其对称的分子结构和强电负性，已被证明是所选功能分子中最好的界面调节剂。 TFSA不仅通过多位点氢键有效稳定FA阳离子，而且通过配位效应钝化欠配位的Pb ²⁺缺陷。此外，TFSA精细调节MeO-2PACz的形态排列并均匀化表面接触电位，从而形成高质量的钙钛矿薄膜，减少界面电荷传输势垒并抑制非辐射复合。因此，0.09 cm ²倒置器件实现了 25.92%（认证为 25.77%）的卓越效率，同时电压损失为 0.36 V，具有出色的长期运行稳定性，代表了基于 RbCsFAMA 的倒置 PSC 的最高值迄今为止基于钙钛矿。此外，12.96 cm ² （有效面积）微型模块的效率高达 22.78%，令人印象深刻，展现出巨大的升级潜力。这项研究开辟了一种有效的策略，可以合理调节埋藏界面能量损失，从而实现高效稳定的倒置PSC。