Introducing substituted groups, such as alkylsilyl , alkoxyl and phenyl/alkoxylphenyl , were demonstrated to be an effective strategy to further improve the photovoltaics performance of 2D conjugated polymers. Actually, these strategies are adaptable to the design of 2D polymer photocatalysts, including varying the heteroatom of the building blocks and altering the side chains with different functional groups to engineer the fundamental properties including band gap, energy levels, carrier mobilities and EBE.