Solution‐Processed High‐Performance Tetrathienothiophene‐Based Small Molecular Blends for Ambipolar Charge Transport

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 m...

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Published in:Advanced functional materials 2018-07, Vol.28 (28), p.n/a
Main Authors: Vegiraju, Sureshraju, Lin, Chih‐Yu, Priyanka, Pragya, Huang, Deng‐Yi, Luo, Xian‐Lun, Tsai, Hsiang‐Chi, Hong, Shao‐Huan, Yeh, Chia‐Jung, Lien, Wei‐Chieh, Wang, Chien‐Lung, Tung, Shih‐Huang, Liu, Cheng‐Liang, Chen, Ming‐Chou, Facchetti, Antonio
Format: Article
Language:English
Subjects:
ambipolar charge transport
blends
Carrier transport
Charge transport
Chemical synthesis
Current carriers
Field effect transistors
Hole mobility
Materials science
Microstructure
Mixtures
Molecular chains
Morphology
organic field‐effect transistors
Semiconductor devices
solution‐shearing
tetrathienoacene
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Summary: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 cm2 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 cm2 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. Solution‐processable dialkylated tetrathienoacene (TTAR)‐derived organic semiconductor and its blends are investigated for organic transistor applications. Blends of the p‐type DbT‐TTAR with the n‐type DTTQ‐11 in 1:1 weight ratio exhibit maximum ambipolar (hole and electron) mobilities of 0.83 and 0.37 cm2 V−1 s−1, respectively, the largest reported so far.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201801025