Aqueous-Processable N-type Semiconducting Polymers with Fine-Tuned Side Chains for Eco-Friendly Organic Electrolyte-Gated Transistors
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초록
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Replacing toxic processing solvents with greener ones is one of the most pressing challenges for commercialization of electronic devices beyond industrial regulations. However, even so-called green solvents show definite harmfulness to both environment and human body. Herein, we fabricated water/ethanol-processed n-type organic electrolyte-gated transistors (OEGTs), utilizing naphthalene diimide-thiophene-based polymers with the different side chains. To impart processability in the mixture of ethanol and water, branched oligo ethylene glycol (OEG) side chains were attached to the NDI backbone. Depending on the length of side chains, aggregation and crystalline characteristics of the polymers could be systematically controlled. As a result, the highest electron mobility of 0.1 cm2/Vs was obtained in P(NDITEG-T)-based OEGTs, which is highest value reported to date, among n-type neutral polymers processed with the use of only eco-friendly solvent