Extended Data Fig. 4: Comparison of absorption spectra with and without an initiator dopant. | Nature

Extended Data Fig. 4: Comparison of absorption spectra with and without an initiator dopant.

From: Efficient molecular doping of polymeric semiconductors driven by anion exchange

Extended Data Fig. 4

Optical absorption spectra of PBTTT thin films after immersion in EMIM-TFSI, with and without F4TCNQ. The spectra show that doping occurs only when F4TCNQ is dissolved in the ionic liquid. Similarly, a PBTTT thin film immersed in a solution of Li-TFSI in n-butyl acetate without F4TCNQ shows no doping. These results demonstrate that F4TCNQ is necessary to initiate the doping reaction.

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