Abstract:
High-quality and uniform self-assembled molecule (SAM) films are critical for the controllable fabrication of high-performance inverted flexible perovskite solar cells (F-PSCs). However, solution-processed SAMs suffer from poor surface coverage and inadequate chemical anchoring on conducting substrates, especially for flexible substrates with high roughness, compromising the charge transport efficiency and device stability. Herein, we introduce thermal evaporation for depositing carbazole-phosphonic SAM films and establish the correlations between molecular configurations and surface properties. Vacuum-evaporated SAMs exhibit enhanced substrate coverage and surface wettability compared to solution-processed counterparts through the regulated molecular packing. The increased surface energy of vacuum-evaporated SAM films accelerates perovskite nucleation kinetics, balances growth rates across the films, and optimizes interfacial contact quality. Molecular configuration tailoring in the SAM backbones further refines the morphological quality and energetic alignment at the buried interface, thus promoting efficient charge transport and reduced non-radiative recombination loss. As a result, the optimized devices using vacuum-evaporated SAM films achieve an impressive power conversion efficiency (PCE) of 25.47% (certified 25.38%), among the highest PCEs reported for F-PSCs. Furthermore, the optimized devices demonstrate enhanced mechanical durability and operational stability, underscoring a practical methodology route toward efficient and stable F-PSCs.
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Emerging Photovoltaic Materials and Devices
Kui Zhao,* Zhou Yang,* Shengzhong (Frank) Liu,* , Adv. Funct. Mater. 2019, 29, 1904014.
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Yucheng Liu, Yunxia Zhang, Zhou Yang, Jiangshan Feng, Zhuo Xu, Qingxian Li, Mingxin Hu, Haochen Ye, Xu Zhang, Ming Liu, Kui Zhao*, Shengzhong(Frank) Liu*, Mater. Today . 2019, 22, 67-75.
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Yucheng Liu, Haochen Ye, Yunxia Zhang, Kui Zhao, Zhou Yang, Yongbo Yuan, Haodi Wu, Guangtao Zhao, Zupei Yang, Jiang Tang, Zhuo Xu,* Shengzhong Frank Liu*, Matter 2019, 1, 465-480
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Direct-Indirect Transition of Pressurized 2D Halide Perovskite: Role of Benzene Ring Stack Ordering
Chaofeng Gao, Ruiping Li, Yiran Li, Rong Wang, Meng Wang, Zhixing Gan, Ligang Bai, Yucheng Liu, Kui Zhao, Shengzhong Liu, Yingchun Cheng,* Wei Huang,* J. Phys. Chem. Lett. 2019, 10, 5687-5693.
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Dounya Barrit, Peirui Cheng, Ming-Chun Tang, Kai Wang, Hoang Dang, Detlef- M. Smilgies, Shengzhong Frank Liu, Thomas D. Anthopoulos*, Kui Zhao*, Aram Amassian*, Adv. Funct. Mater. 2019, 1807544.
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Yalan Zhang, Peijun Wang, Ming-Chun Tang, Dounya Barrit, Weijun Ke, Junxue Liu, Tao Luo, Yucheng Liu, Tianqi Niu, Detlef-M. Smilgies, Zhou Yang, Zhike Liu, Shengye Jin, Mercouri G. Kanatzidis*, Aram Amassian*, Shengzhong(Frank) Liu*, Kui Zhao*, J. Am. Chem. Soc. 2019, 141, 2684-2694.
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Ligand-Size Related Dimensionality Control in Metal Halide Perovskites
Peirui Cheng, Peijun Wang, Zhuo Xu, Xuguang Jia, Qilin Wei, Ningyi Yuan, Jianning Ding, Ruipeng Li, Guangtao Zhao, Yingchun Cheng, Kui Zhao*, Shengzhong(Frank) Liu*, ACS Energy Lett. 2019, 4, 1830-1838.
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Scalable Ambient Fabrication of High-Performance CsPbI2Br Solar Cells
Yuanyuan Fan, Junjie Fang, Xiaoming Chang, Ming-Chun Tang, Dounya Barrit, Zhuo Xu, Zhiwu Jiang, Jialun Wen, Huan Zhao, Tianqi Niu, Detlef- M. Smilgies, Shengye Jin, Zhike Liu, Er Qiang Li, Aram Amassian*, Shengzhong Liu*, Kui Zhao*, Joule 2019, 3, 2485.
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Guangbao Wu, Xing Li, Jiyu Zhou, Jianqi Zhang, Xuning Zhang, Xuanye Leng, Peijun Wang, Ming Chen, Dongyang Zhang, Kui Zhao*, Shengzhong(Frank) Liu, Huiqiong Zhou*, Yuan Zhang*, Adv. Mater. 2019, 1903889.
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Interfacial Engineering at the 2D/3D Heterojunction for High-Performance Perovskite Solar Cells
Tianqi Niu, Jing Lu, Xuguang Jia, Zhuo Xu, Ming-Chun Tang, Dounya Barrit, Ningyi Yuan, Jianning Ding, Xu Zhang, Yuanyuan Fan, Tao Luo, Yalan Zhang, Detlef-M Smilgies, Zhike Liu, Aram Amassian, Shengye Jin, Kui Zhao*, Shengzhong(Frank) Liu, Nano Lett. 2019, 19, 7181.