Abstract
Two-dimensional (2D) covalent organic frameworks (COFs) with periodic functional n-electron systems are an emerging class of optoelectronic materials. However, almost all conjugated COFs so far are insoluble and hard to process, which hampers severely their optoelectronic applications. Here, a solution-processable, nanoscale and sp2 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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51673097, 21875122) and Ministry of Science and Technology of China (2016YFA0200200, 2019YFA0705903). The authors would like to thank Prof. Y. C. Zhou in Sun Yat-sen University for the discussion of materials calculation.
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Fu, Q., Wang, T., Sun, Y. et al. A solution-processed nanoscale COF-like material towards optoelectronic applications. Sci. China Chem. 64, 82–91 (2021). https://doi.org/10.1007/s11426-020-9865-3
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DOI: https://doi.org/10.1007/s11426-020-9865-3