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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 …