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A ternary organic semiconducting blend composed of a small‐molecule, a conjugated polymer, and a molecular p‐dopant is developed and used in solution‐processed organic transistors with hole mobility exceeding 13 cm2 V−1 s−1 (see the Figure). It is shown that key to this development is the incorporation of the p‐dopant and the formation of a vertically phase‐separated film microstructure.
Organic field‐effect transistors (OFETs) are used to investigate the evolution of the solid‐state microstructure of blends of poly(3‐hexylthiophene) (P3HT) and [6,6]‐phenyl C61‐butyric acid methyl ester (PC61BM) upon annealing. Changes in the measured field‐effect mobility of holes and electrons are shown to reveal relevant information about the phase‐segregation in this system, which are in agreement...
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