Journal
MACROMOLECULES
Volume 55, Issue 14, Pages 6160-6166Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.2c00791
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Funding
- National Creative Research Initiative Program
- National Research Foundation of Korea [2022R1A3A3002149]
- National Research Foundation of Korea [2022R1A3A3002149] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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By synthesizing polymer films with specific end-on orientation, we achieved end-on orientation and lamellar nanostructures, which significantly enhanced the vertical hole mobility of the film.
ABSTRACT: We synthesized the poly(3-hexylthiophene)-block-poly(3with a regioregularity (RR) of the P3HT block having 82% to obtain an end-on orientation throughout the entire film thickness. Although P3HT-containing block copolymers with high RR = 86% of the P3HT block showed fibril morphology because of strong rod-rod interaction of P3HT, P3HT-b-P3MEGT with RR = 82% of P3HT exhibited a welldefined lamellar morphology induced by microphase separation between P3HT and P3MEGT blocks. P3HT-b-P3MEGT thin films showed parallel-oriented lamellar nanostructures on a silicon substrate because of a large difference in surface tension between hydrophobic P3HT and hydrophilic P3MEGT blocks. Parallel-oriented lamellar nanostructures induced the end-on orientation of P3HT and P3MEGT chains across the entire film. End-on-oriented P3HT-b-P3MEGT thin films showed much enhanced vertical hole mobility, 30 times higher than that of edge-on-oriented P3HT homopolymer thin films with a high RR of 95%.
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