The introduction of heteroatoms into polymer backbones can bring along many unique
properties. For example, the nitrogen and boron atoms with lone pairs can promote the electron
mobility along the polymer backbone. These n-type CPs remarkably enrich the community of
hole-injection materials for EL devices [34]. CPs containing silicon and sulfur atoms have also
attracted great attention for their huge potential as semiconducting materials [35]. Decarbonylative
polycoupling, polyhydrothiolation and polyhydrosilylation are all facile synthetic methods for
building conjugated skeletons with heteroatoms.