Dopant-Enhanced Ordering and Conductivity of Solution-Processed Semiconducting Polymer Thin Films
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초록
내용
The impact of dopant loading into semiconducting polymer solutions is investigated to control the optoelectrical properties of poly(3-hexyl thiophene)s. PHT system doped with different F4TCNQ dopant loadings shows controllable conjugated structures in both solutions and spun-cast films. Via simple blending of RR PHT and F4TCNQ solutions, the nucleation and growth of PHT aggregates are with an increase in molar dopant ratio (MDR). Also, it is found that some dopants can be positioned to the intermolecular backbones of RR PHT and form a mixed crystalline structure, which has a shorter π-π overlapping distance, in comparison to the pure polymer system. At low-level of MDR = 0.005 (or 0.015) the conjugated crystallinity of the doped RR PHT self-assembled film has been greatly improved, and the carrier mobility (0.1 cm2V-1s-1) of resultant OTFTs has increased by more than 100 times compared to neat RR PHT.