Trap state inducing nonradiative recombination is a main obstacle for achieving high-efficiency metal-halide perovskite photovoltaics. Here, we introduced a straightforward strategy by utilizing a functional additive in perovskite antisolvent to ameliorate the quality of perovskite film. The additive Y6, extensively applied in organic optoelectronics as electron donor, possesses capacity to coordinate with the lead ion (Pb²⁺) through the formation of Lewis adducts. The introduction of nonfullerene Y6 effectively suppressed nonradiative recombination through passivating the electronic defects, such as undercoordinated Pb²⁺ or Pb clusters, abating defects density to acquire high quality films with improved stability, simultaneously enabling a well-matched energy alignment at interface between perovskite/electronic transport material to elevate charge extraction through graded heterojunction structure, ultimately providing planar inverted perovskite solar cells with power conversion efficiency up to 20.6% from current-voltage measurements and a steady-state 20.3% power output. This work demonstrates Y6-based antisolvent engineering delivers a multifunctional promising method permitting perovskite films with enlarged grain sizes and diminished defects density by forming Lewis adducts intermediate, simultaneously obtaining interfacial gradient heterostructure to facilitate charge transfer processes.

陷阱态诱导非辐射复合是实现高效金属卤化物钙钛矿光伏的主要障碍。在这里，我们通过利用钙钛矿抗溶剂中的功能性添加剂来改善钙钛矿薄膜的质量，引入了一种简单的策略。添加剂Y6作为电子供体广泛应用于有机光电子学，具有通过形成路易斯加合物与铅离子（Pb ²⁺）配位的能力。非富勒烯 Y6 的引入通过钝化电子缺陷（如配位不足的 Pb ^2+）有效抑制了非辐射复合或 Pb 簇，降低缺陷密度以获得具有更高稳定性的高质量薄膜，同时在钙钛矿/电子传输材料之间的界面实现良好匹配的能量排列，通过梯度异质结结构提高电荷提取，最终提供具有功率的平面倒置钙钛矿太阳能电池电流-电压测量的转换效率高达 20.6%，稳态功率输出为 20.3%。这项工作证明了基于 Y6 的反溶剂工程提供了一种多功能的有前途的方法，通过形成路易斯加合物中间体，同时获得界面梯度异质结构以促进电荷转移过程，允许钙钛矿薄膜具有更大的晶粒尺寸和减少的缺陷密度。