Diffusion limited synthesis of wafer-scale covalent organic framework films for adaptative visual device

Minghui Liu, Junhua Kuang, Xiaocang Han, Youxing Liu, Wenqiang Gao, Shengcong Shang, Xinyu Wang, Jiaxin Hong, Bo Guan, Xiaoxu Zhao (), Yunlong Guo (), Jichen Dong (), Zhiyuan Zhao, Yan Zhao, Chuan Liu, Yunqi Liu and Jianyi Chen ()
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Minghui Liu: Chinese Academy of Sciences
Junhua Kuang: Chinese Academy of Sciences
Xiaocang Han: Peking University
Youxing Liu: Chinese Academy of Sciences
Wenqiang Gao: Chinese Academy of Sciences
Shengcong Shang: Chinese Academy of Sciences
Xinyu Wang: Chinese Academy of Sciences
Jiaxin Hong: Chinese Academy of Sciences
Bo Guan: Chinese Academy of Sciences
Xiaoxu Zhao: Peking University
Yunlong Guo: Chinese Academy of Sciences
Jichen Dong: Chinese Academy of Sciences
Zhiyuan Zhao: Chinese Academy of Sciences
Yan Zhao: Fudan University
Chuan Liu: Sun Yat-sen University
Yunqi Liu: Chinese Academy of Sciences
Jianyi Chen: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Synthesizing high-crystalline covalent organic framework films is highly desired to advance their applications in two-dimensional optoelectronics, but it remains a great challenge. Here, we report a diffusion-limited synthesis strategy for wafer-scale uniform covalent organic framework films, in which pre-deposited 4,4′,4″,4‴-(1,3,6,8-Tetrakis(4-aminophenyl) pyrene is encapsulated on substrate surface with a layer of covalent organic framework prepolymer. The polymer not only prevents the dissolution of precursor, but limits the reaction with terephthalaldehyde dissolved in solution, thereby regulating the polymerization process. The size depends on growth substrates, and 4-inch films have been synthesized on silicon chips. Their structure, thickness, patterning and crystallization degree can be controlled by adjusting building blocks and polymerization chemistries, and molybdenum disulfide have been used as substrates to construct vertical heterostructure. The measurements reveal that using covalent organic framework as a photosensitive layer, the heterojunction displays enhanced photoelectric performance, which can be used to simulate the adaptative function of visual system.

Date: 2024
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DOI: 10.1038/s41467-024-54844-4

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