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Relationship between the Structure of Modified Polysilane and Its Electronic Properties

2020/03/10
The main factors affecting the electronic properties of the silane modified polymer are as follows.

1.1 Main chain atom and chain length
In the carbon group element, from Si to Sn, as the atomic radius increases, the deformability of the formed σ bond gradually increases, and the bond energy and the transition energy gap decrease in turn. Therefore, from Si to Sn, when the substituents are the same, the ultraviolet absorption peak of the chain polymer gradually shifts red, and the photochemical reactivity gradually increases. When a hetero atom is mixed into the main chain, the σ conjugate structure is destroyed. In the absence of a conjugated structure, the associated properties of the silane modified polymer are instead reduced.

1.2 Introducing a conjugated group into the silicon main chain

1.3 Side chain substituent properties

1.4 Crosslinked, mesh and star structures
The increase in the number of dimensions increases the delocalization of the polysilane polymer. The front rail track level difference is reduced. Therefore, the ultraviolet absorption of polysilane will be red-shifted as the dimension increases, and the emission spectrum broadens. Therefore, crosslinked, networked or star-shaped polysilanes can illuminate in the visible region compared to most polysilanes that emit only in the ultraviolet region. However, due to the branching point of the reticulated polysilane, the crosslink density is large, resulting in a decrease in the total conformation of the polysilane. Thus, the molecular chain flexibility and solubility of the silane modified polymer are lowered.