標題: 2,2 \'-Bis(trifluoromethyl)biphenyl as a building block for highly ambient-stable, amorphous organic field-effect transistors with balanced ambipolarity
作者: Chaing, Chi-Jui
Chen, Jyh-Chien
Kuo, Yu-Ju
Tsao, Hsiang-Yen
Wu, Kuan-Yi
Wang, Chien-Lung
應用化學系
Department of Applied Chemistry
公開日期: 2016
摘要: Novel conjugated polymers, PBPV-TPA, PBPV-CBZ, PBPV-MEH and PBPV-FLO, consisting of trifluoromethyl-substituted biphenyl (2,2\'-bis(trifluoromethyl)biphenyl, CF3-BP) as the acceptor with various aromatic donors (triphenylamine TPA, carbazole CBZ, 2-(2-ethylhexyloxy)-5-methoxybenzene MEH and fluorene FLO, respectively) have been successfully synthesized. Their amorphous features, confirmed by wide-angle X-ray scattering, small-angle X-ray scattering and atomic force microscopy, are attributed to lateral side chains on the CBZ, MEH and FLO units, and the propeller geometry of the TPA unit. By integration of CF3-BPs into the polymer backbone, the ambipolarities and well-balanced charge mobilities of OFETs based on these polymers were successfully demonstrated. OFETs based on PBPV-FLO exhibit the highest hole mobility of 0.0152 cm(2) V-1 s(-1) and electron mobility of 0.0120 cm(2) V-1 s(-1). In addition, these OFETs also exhibit annealing-free characteristics and ambient stability. The OFET performance without encapsulation remained nearly unchanged in ambient conditions for up to 90 days. This could be attributed to the enhanced oxidative stability from their relatively deep HOMO energy levels and better moisture resistance from the trifluoromethyl substitution. Considering the ambipolar, annealing-free and ambient-stable properties of these CF3-BP-based amorphous conjugated polymers, the electron-accepting CF3-BP unit can be considered as a promising building block in preparing the easily processable conjugated polymers used in high-stability optoelectronic applications.
URI: http://dx.doi.org/10.1039/c5ra25884g
http://hdl.handle.net/11536/133957
ISSN: 2046-2069
DOI: 10.1039/c5ra25884g
期刊: RSC ADVANCES
Volume: 6
Issue: 11
起始頁: 8628
結束頁: 8638
顯示於類別:期刊論文