Split‐Standing Molecular Engineering for Textured Silicon/Perovskite Tandems

作者：Xiaonan Wang, Yuan Tian, Libing Yao, Shaochen Zhang, Qingqing Liu, Ke Zhao, Jiazhe Xu, Jingjing Zhou, Caner Değer, İlhan Yavuz, Jingjing Xue, Rui Wang · 发表于：Advanced Science · 年份：2025 · DOI：10.1002/advs.202505288 · 被引用次数：7 · 研究领域：Perovskite Materials and Applications、Nanowire Synthesis and Applications、Electronic and Structural Properties of Oxides

Abstract To effectively minimize reflection losses and achieve compatibility with industrial‐scale silicon production lines, textured silicon/perovskite tandem solar cells have garnered significant attention in recent research. However, achieving uniform and stable coverage of the textured silicon substrate with hole‐selective layer (HSL) remains a significant challenge. Herein, a HSL material, DPAICz ((indolo[2,3‐a]carbazole‐11,12‐diylbis(ethane‐2,1‐diyl))bis(phosphonic acid)), is reported specifically designed for textured silicon substrate. Compared to the typical HSL material 2PACz, DPAICz features a π‐expanded conjugated core and multiple anchoring groups, forming a split‐standing configuration with anchoring groups positioned on opposite sides, resulting in superior anchoring stability on textured substrate under external stimuli. Moreover, DPAICz exhibited a larger molecular dipole moment and a more pronounced p‐type characteristic, enhancing the interfacial hole extraction efficiency. Consequently, wide‐bandgap (1.68 eV) perovskite solar cells employing DPAICz as the HSL achieved a champion power conversion efficiency (PCE) of 23.42%. Introducing the DPAICz into monolithic silicon/perovskite tandem solar cells greatly improved their performance, achieving a remarkable PCE of 32.55% in 1 cm 2 area. Importantly, the unencapsulated tandems based on DPAICz exhibited significantly enhanced long‐term operational stability, retaining 96% of its initial PCE after 880 h of con...