High Vertical Hole Mobility through Minimization of Water-Induced Traps by F4TCNQ Doping in Conjugated Amphiphilic Diblock Copolymers

Le résumé fourni par la source

2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) in acetonitrile (ACN) was sequentially doped into an amphiphilic poly(3-hexylthiophene)- block -poly(3-(2-methoxyethoxy)methylthiophene) copolymer (P3HT- b -P3MEGT) thin film with an end-on orientation, in which both polymer backbones and π–π stacking were oriented vertically to a substrate. Due to the use of the polar solvent (ACN), F4TCNQ was predominantly doped in the amorphous region of P3HT- b -P3MEGT. At low F4TCNQ concentration ( c ) in ACN, the hole mobility (μ) was slightly lower than that of the neat P3HT- b -P3MEGT film owing to the increase in the distance between the polymer backbones. However, with increasing c, it increased and reached the maximum at c = 0.8 mg mL –1 . The maximum μ was (8.04 ± 0.14) × 10 –2 cm 2 V –1 s –1, which is twice larger than that (4.08 × 10 –2 cm 2 V –1 s –1 ) of the neat P3HT- b -P3MEGT film. This is attributed to the effective suppression of water-induced traps, generated from the hydrophilic P3MEGT containing an ethylene glycol unit.

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