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Solution‐Processed High‐Performance Tetrathienothiophene‐Based Small Molecular Blends for Ambipolar Charge Transport
Author(s) -
Vegiraju Sureshraju,
Lin ChihYu,
Priyanka Pragya,
Huang DengYi,
Luo XianLun,
Tsai HsiangChi,
Hong ShaoHuan,
Yeh ChiaJung,
Lien WeiChieh,
Wang ChienLung,
Tung ShihHuang,
Liu ChengLiang,
Chen MingChou,
Facchetti Antonio
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201801025
Subject(s) - ambipolar diffusion , materials science , electron mobility , charge carrier , crystallinity , organic semiconductor , thiophene , microstructure , small molecule , organic field effect transistor , semiconductor , chemical engineering , field effect transistor , transistor , optoelectronics , electron , organic chemistry , composite material , chemistry , biochemistry , physics , quantum mechanics , voltage , engineering
Four soluble dialkylated tetrathienoacene ( TTAR) ‐based small molecular semiconductors featuring the combination of a TTAR central core, π‐conjugated spacers comprising bithiophene ( bT ) or thiophene ( T ), and with/without cyanoacrylate ( CA ) end‐capping moieties are synthesized and characterized. The molecule DbT‐TTAR exhibits a promising hole mobility up to 0.36 cm 2 V −1 s −1 due to the enhanced crystallinity of the microribbon‐like films. Binary blends of the p‐type DbT‐TTAR and the n‐type dicyanomethylene substituted dithienothiophene‐quinoid ( DTTQ‐11 ) are investigated in terms of film morphology, microstructure, and organic field‐effect transistor (OFET) performance. The data indicate that as the DbT‐TTAR content in the blend film increases, the charge transport characteristics vary from unipolar (electron‐only) to ambipolar and then back to unipolar (hole‐only). With a 1:1 weight ratio of DbT‐TTAR DTTQ‐11 in the blend, well‐defined pathways for both charge carriers are achieved and resulted in ambipolar transport with high hole and electron mobilities of 0.83 and 0.37 cm 2 V −1 s −1 , respectively. This study provides a viable way for tuning microstructure and charge carrier transport in small molecules and their blends to achieve high‐performance solution‐processable OFETs.