A solution-processed nanoscale COF-like material towards optoelectronic applications
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solution-processed nanoscale COF-like material towards optoelectronic applications 1†
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Qiang Fu , Ting Wang , Yanna Sun , Nan Zheng , Zengqi Xie , Di Lu , Zhiyuan Xu , 1,4 3 1,4* Xiangjian Wan , Yamin Zhang & Yongsheng Liu 1
The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China; Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China
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University of Technology, Guangzhou 510640, China; State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, 4
China; Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300071, China Received July 10, 2020; accepted September 3, 2020; published online November 5, 2020
Two-dimensional (2D) covalent organic frameworks (COFs) with periodic functional π-electron systems are an emerging class of optoelectronic materials. However, almost all conjugated COFs so far are insoluble and hard to process, which hampers 2 severely their optoelectronic applications. Here, a solution-processable, nanoscale and sp carbon-conjugated COF-like material, PDPP-C20 was successfully designed and synthesized. The solution-processed PDPP-C20 films exhibit high crystallinity and excellent charge transport properties along out-of-plane directions, combined with the highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) levels of −5.36/−3.75 eV, making PDPP-C20 suitable for electronic device applications. An efficiency as high as 21.92% has been demonstrated when it was used as a functional interfacial layer in perovskite solar cells, coupled with dramatically improved stability in comparison with the control device due to the superior hydrophobicity of PDPP-C20 layer as well as its passivation effect on perovskite surface. Furthermore, the soluble PDPP-C20 could also be used as donor in bulk-heterojunction organic solar cells and an initial efficiency of 2.46% has been achieved. These results indicate that this new class of soluble and nanoscale COF-like materials should offer a new arena of functional materials for optoelectronic devices. solution-processable, covalent organic frameworks, perovskite solar cells, mobility, passivation Citation:
Fu Q, Wang T, Sun Y, Zheng N, Xie Z, Lu D, Xu Z, Wan X, Zhang Y, Liu Y. A solution-processed nanoscale COF-like material towards optoelectronic applications. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-020-9865-3
1 Introduction Covalent organic frameworks (COFs) are a class of crystalline polymers in which organic building blocks are condensed into extended lattice structures with periodic skeletons [1–5]. Owing to their porous structure, tunable †These authors contributed equally to this work. *Corresponding author (email: [email protected])
functionality and versatile topological synthetic
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