2025年4月7日出版的《科学通报》杂志发表了武汉大学柯维俊小组的最新成果，他们研究出宽带隙钙钛矿和串联太阳能电池的协同双分子侵蚀愈合界面钝化。

为了提高WBG钙钛矿膜的钝化性能和界面均匀性，提出了一种双分子协同腐蚀-愈合钝化策略。与依赖卤化物铵盐的传统钝化方法不同，该方法直接使用前体二胺来钝化界面缺陷，抑制复合，并诱导轻微的表面腐蚀，在钙钛矿表面产生随机开口。然后，配对的碘化哌嗪分子穿透这些开口，实现更深的缺陷钝化和表面愈合，形成光滑、均匀的界面。该策略使1.78 eV WBG钙钛矿太阳能电池实现了20.47%的功率转换效率（PCE）和85.10%的超高填充系数。

此外，当与窄带隙钙钛矿亚电池集成时，制备的全钙钛矿串联太阳能电池的pce分别为28.36% （0.07 cm²）和27.52% （1.02 cm²）。这种双分子侵蚀愈合钝化策略为优化钙钛矿界面提供了一种有效且可扩展的解决方案，推动了WBG钙钛矿和串联太阳能电池的性能和可制造性的进步。

研究人员表示，全钙钛矿串联太阳能电池由于其优异的性能和多功能性而呈现出巨大的潜力。然而，它们的实际实施受到重大挑战的阻碍，特别是在大面积器件中，宽带隙（WBG）钙钛矿亚电池的界面不均匀性导致高开路电压损失和低填充因子。

附：英文原文

Title: Synergistic bimolecular erosion-healing interfacial passivation for wide-bandgap perovskite and tandem solar cells

Author: Wanping Chen, Guojia Fang, Weijun Ke

Issue&Volume: 2025/04/07

Abstract: All-perovskite tandem solar cells present immense potential due to their exceptional performance and versatility. However, their practical implementation is impeded by significant challenges, particularly in large-area devices, where interfacial inhomogeneities in wide-bandgap (WBG) perovskite subcells lead to high open-circuit voltage losses and low fill factors. Here, we introduce a synergistic bimolecular corroding-healing passivation strategy to enhance WBG perovskite films’ passivation and interfacial uniformity. Unlike conventional passivation methods relying on halide ammonium salts, this approach directly employs precursor diamines to passivate interfacial defects, suppress recombination, and crucially induce mild surface corrosion, creating random openings on the perovskite surface. Paired molecules of piperazinium iodide then penetrate these openings, enabling deeper defect passivation and surface healing to form a smooth, homogeneous interface. This strategy enabled 1.78 eV WBG perovskite solar cells to achieve a power conversion efficiency (PCE) of 20.47% with an ultrahigh fill factor of 85.10%. Furthermore, when integrated with narrow-bandgap perovskite subcells, the fabricated all-perovskite tandem solar cells delivered PCEs of 28.36% (0.07 cm2) and 27.52% (1.02 cm2). This dual-molecular erosion-healing passivation strategy offers an effective and scalable solution to optimize the perovskite interface, driving advancements in the performance and manufacturability of WBG perovskite and tandem solar cells.

DOI: 10.1016/j.scib.2025.04.017

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927325003664