Effects of Solution-Blended Dopant on Assembly and Charge Transport of Conjugated Semiconducting Polymers
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초록
내용
The impact of dopant loading into solution-processable semiconducting polymer solutions was systemically investigated for PHTs. A 97% regioregular (RR) PHT system with different F4TCNQ loadings exhibits distinguishable and controllable conjugated structures. The nucleation and growth of RR PHT crystallites were enhanced greatly through simple solution blending with a slight increase in the molar dopant ratio (MDR). The result originates from the electron transport between the donor-like polymer segment and the acceptor-like dopant. Even at a low doping level, MDR = 0.015, the Coulombic interaction between the PHT cations and F4TCNQ anions led to the development of highly ordered and conjugated nanodomains in as-spun films, yielding an exceptionally high carrier mobility of approximately 0.10 cm2 V-1 s-1 (in organic thin-film transistors), which was considerably higher than that (~10-3 cm2 V-1 s-1) of the undoped system.