“…1,3,5-Tri(thiophen-2-yl)benzene (TTB), a dendritic rigid π-conjugated molecule, was usually used as a cross-linker to synthesize star-shaped conjugated polymers, which afford high electron and hole mobility. 20,21 With high structural symmetry, three-armed TTB has been gradually recognized as an appropriate building block for novel thiophene-COFs. 22 As shown in Fig.…”