期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 29, 页码 15978-15987出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b04082
关键词
quinoidal molecules; diketopyrrolopyrrole; n-type organic semiconductors; spin-coated OFET's; alkyl-side-chain engineering
资金
- National Natural Science Foundation of China [21290191, 21333011]
- National Basic Research Program of China [2011CB808401]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12000000]
A series of thiophene-diketopyrrolopyrrole-based quinoidal small molecules (TDPPQ-2TDPPQ-5) bearing branched alkyl chains with different side-chain lengths and varied branching positions are synthesized. Field-effect transistor (FET) measurement combined with thin-film characterization is utilized to systematically probe the influence of the side-chain length and branching position on the film microstructure, molecular packing, and, hence, charge-transport property. All of these TDPPQ derivatives show air-stable n-channel transporting behavior in spin-coated FET devices, which exhibit no significant decrease in mobility even after being stored in air for 2 months. Most notably, TDPPQ-3 exhibits an outstanding n-channel semiconducting property with electron mobilities up to 0.72 cm(2) V-1 s(-1), which is an unprecedented value for spin-coated DPP-based n-type semiconducting small molecules. A balance of high crystallinity, satisfactory thickness uniformity and continuity, and strong intermolecular interaction accounts for the superior charge-transport characteristics of TDPPQ-3 films. Our study demonstrates that tuning the length and branching position of alkyl side chains of semiconducting molecules is a powerful strategy for achieving high FET performance.
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