Diketopyrrolopyrrole based molecular semiconductors with intrinsic conductivity
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Pagination
117678 - ?
Publisher
DOI
10.1016/j.synthmet.2024.117678
Journal
Synthetic Metals
ISSN
0379-6779
Metadata
Show full item recordAbstract
Intrinsically conducting diketopyrrolopyrrole (DPP) compounds functionalised with pendant quaternary
ammonium groups have been synthesised. The hydroxide forms were found to be the product of base hydrolysis
of the DPP amide during synthesis, likely made possible by restricted resonance. This gave mixed chemical
compositions of solutions and conductive films formed by drop-casting. Chemical decomposition of the hydrolysed compounds was also observed at temperatures above 85 ◦C. Conductivities of approximately 3 × 10− 4 S
m− 1 were observed in processed films of DPP ammonium hydroxides. It was also found that trifluoroacetic acid
(TFA) DPP precursors gave clear electron paramagnetic resonance (EPR) signals indicative of doping and
exhibited conductivities one order of magnitude larger than the hydroxides. This opens the possibility of using
ammonium TFAs as moieties for doping organic semiconductors.