| Summary: | 碩士 === 國立中央大學 === 化學學系 === 106 === New small molecules based on TSBT, DSDTT, and SeBT cores have
been synthesized for organic thin film transistors (OTFTs).
For the first TSBT series, n-type TSBTQ-14 (TSBTQ with C14H29
chains) and TSBTQ-6 (TSBTQ with C6H13 chains) exhibited mobility of
0.14 cm2V-1s-1 and 0.10 cm2V-1s-1. To further complete the side chains
effect study, TSBTQ-10 (1; TSBTQ with C10H21 chains) was synthesized
and characterized. Via solution shearing, TSBT-10 exhibits the best
mobility up to 0.18 cm2V-1s-1 in this series.
For the second DSDTT series, DDTT-DSDTT-10 (DSDTT with
C10H21 chains) exhibited high mobility 2.6 cm2V-1s-1. To further complete
the side chains effect study, DDTT-DSDTT-8 (2; with C8H17 chains) was
synthesized and characterized. Via solution shearing, DDTT-DSDTT-8
demonstrates the best mobility up to 3.2 cm2V-1s-1. Both molecular
structures of DSDTTs were determined by single crystal X-ray diffraction
and exhibits two parallel face-to-face columnar stacking’s with a very close
interplanar core distance of 3.6 Å .
For the third series, a couple new small molecules based on the
selenylated bithiophene (SeBT) with different end-capped aromatic groups
and alkyl chains were developed. DDTT-SeBT-14 (7; with C14H29 chains)
exhibits the highest mobility of 4.00 cm2V-1s-1 via solution shearing. The
molecular structures of DDTT-SeBT-14 and DDTT-SeBT-10 (6) were
determined by single crystal X-ray diffraction and showed brick-type
iv
molecular stacking.
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