End-on orientation of Poly(3-alkyl thiophene)s by microphase separation of lamellar forming amphiphilic diblock copolymer
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초록
내용
To fabricate end-on orientation of P3AT, amphiphilic diblock copolymers consisting of P3ATs were synthesized. We synthesized poly(3-dodecyl thiophene)-block-poly(3-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)methyl thiophene) copolymer (P3DDT-b-P3TEGT) using the GRIM method. The synthesized P3DDT-b-P3TEGT showed lamellar microdomains, confirmed by SAXS. The thin film morphology measured by AFM and GIWAXS showed parallel oriented lamellar microdomains. This is because of a large difference of surface tension between hydrophobic P3DDT and hydrophilic P3TEGT blocks. Thus, both P3DDT and P3TEGT backbone chains were oriented perpendicularly to the lamellar layer, and the end-on orientation of P3DDT chains was obtained. P3DDT-b-P3TEGT film showed much improved hole mobility compared with neat P3DDT film in spite of presence of P3TEGT block with low hole mobility. This indicates that end-on orientation is very effective for designing high performance vertically operating devices.