The Role of Side Chains and Hydration on Mixed Charge Transport in n-Type Polymer Films.

A slight trend can be observed in the solution spectra between the branched side chain variants, wherein the intramolecular charge transfer (ICT) absorbance feature, located around 600 nm, appears to decrease in intensity with respect to the normalized π–π * feature at 400 nm when increasing side chain length.

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However, among the three variants, a clear trend is seen where the longer the side chain is, the more water enters the film (Figure 3d ).

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