Abstract:
Ambient printing of perovskite solar cells (PSCs) faces severe challenges in controlling crystallization under humid conditions, leading to substantial performance losses compared to inertly processed devices. While ligand-assisted coordination is known to modulate crystal growth, a precise understanding of how specific chemical bonds influence crystallization dynamics during ambient printing remains elusive. Herein, we unveil a dual-functionalized bonding (DFB) mechanism enabled by aromatic formamidine ligands that concurrently coordinate with both the inorganic framework and organic cations during ambient printing. The key mechanistic insight lies in the ability of ligands to form simultaneous coordination bonds with [PbI6]4— octahedra and hydrogen bonds with formamidinium ions (FA+), which collectively delay nucleation, suppress the δ-phase formation, and widen the recrystallization window. By incorporating an electron-deficient triazole ring into the ligand backbone, we enhance this bifunctional binding effect, leading to superior crystallization control and defect suppression. The resulting perovskite films exhibit remarkable homogeneity, low trap density, and enhanced carrier diffusion. Consequently, ambient-printed devices achieve champion power conversion efficiencies of 25.57% for 0.09 cm2, 23.98% for 1.04 cm2, and 22.98% in 5 × 5 cm2 mini-modules. The optimized devices retain over 90% of their initial performance after 1,000 h of continuous operation. This work provides a profound mechanistic framework for molecular-level crystallization control in printed photovoltaics
https://doi.org/10.1002/anie.202520159
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Haojin Li, Xinmei Liu, Tinghuan Yang, Chuang Ma*, Yachao Du, Peng Xu, Lu Zhang, Xin Song, Qingyue Cui, Shengli Zhao, Zhou Yang, Shengzhong Frank Liu, Shengye Jin*, and Kui Zhao*, ACS Energy Lett. 2023, acsenergylett.3c02152.
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Highly Stretchable Conjugated Polymer/Elastomer Blend Films with Sandwich Structure
Ru Qin, Yin Wu, Zicheng Ding, Rui Zhang, Jifa Yu, Wenliang Huang, Dongle Liu, Guanghao Lu, Shengzhong (Frank) Liu, Kui Zhao, Yanchun Han, Macromolecular Rapid Communications. 2023, marc.202300240.
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Shiqiang Wang,# Tinghuan Yang,# Yingguo Yang,# Yachao Du, Wenliang Huang, Liwei Cheng, Haojin Li, Peijun Wang, Yajie Wang, Yi Zhang, Chuang Ma, Pengchi Liu, Guangtao Zhao, Zicheng Ding, Shengzhong (Frank) Liu, Kui Zhao* Advanced Materials, 2023. adma.202305314.
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