Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 217, Issue 4, Pages 537-542Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201500354
Keywords
conducting polymer; phase separation; polarization; polymer chain alignment; ultrafast laser
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Funding
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Korean Government [NRF-2015M2A2A6A03044907, NRF-2014R1A1A2058024, NRF-2013R1A1A 2006868]
- Center for Advanced Meta-Materials (CAMM) - Ministry of Science, ICT and Future Planning as Globla Frontier Project [CAMM-2014M3A6B3063707]
- World Class 300 project (WC300 R&D) of the SMBA (Korea) [S2317456]
- National Research Foundation of Korea [2014R1A1A2058024, 2014M3A6B3063707, 2015M2A2A6A03044907] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Tunable and selective areal polymer chain alignment method is developed for spin-cast blend films of poly(3-hexylthiophene)(P3HT):[6,6]-phenyl-C61-butlyric methyl ester (PCBM) system by a femtosecond laser process. The chain alignment, phase separation, and molecular structure of the laser exposed P3HT: PCBM films are investigated by grazing incidence wide angle X-ray scattering and micro-Raman analysis. The alkyl chains of P3HT polymer become highly ordered along the polarization axis of the laser. Thus, the amount of desirable face-on configuration for solar cell application is largely enhanced with a subsequent postannealing process. Vertically expanded morphology up to 200 nm on P3HT: PCBM films is also prompted by the laser irradiation without deteriorating intramolecular structure and changing chemical composition. Simultaneously, vertical phase separation of PCBM toward surface is induced at exposed region.
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