Carrier transport properties of monodisperse glassy-nematic oligofluorenes in organic field-effect transistors
Carrier transport properties of monodisperse glassy-nematic oligofluorenes in organic field-effect transistors
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DOI：
10.1021/cm048532s
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发表时间：
2005-01
影响因子：
8.6
通讯作者：
T. Yasuda;and Katsuhiko Fujita;T. Tsutsui;Y. Geng;and Sean W. Culligan;Shaw H. Chen
中科院分区：
文献类型：
--
作者：
T. Yasuda;and Katsuhiko Fujita;T. Tsutsui;Y. Geng;and Sean W. Culligan;Shaw H. Chen
用七氟烯F(Pr)5F(MB)2、十二氟烯F(MB)10F(EH)2和聚（9,9′-二辛基芴）PFO制备场效应晶体管。制备了单畴、多畴玻璃-向列膜和玻璃-非晶膜，用于测量空穴迁移率。在单畴膜中，μ∥值由低聚芴的链长和聚芴的持续长度决定。多域膜中的迁移率介于单域膜的μ∥和μ⊥之间。非晶态薄膜具有最低的迁移率，可能是由于几何和能量紊乱。含有F(MB)10F(EH)2单畴玻璃向列膜的OFET的场效应迁移率为0.012 cm2/Vs，通/关电流比为1.0 × 104，比PFO单畴玻璃向列膜有了很大的提高。
A heptafluorene, F(Pr)5F(MB)2, a dodecafluorene, F(MB)10F(EH)2, and poly(9,9‘-dioctylfluorene), PFO, were used to prepare field-effect transistors. Monodomain and polydomain glassy-nematic films as well as glassy-amorphous films were prepared for the measurement of hole mobility. In a monodomain film, the μ∥ value is determined by the chain length in oligofluorene and the persistence length in polyfluorene. Mobility in a polydomain film lies between μ∥ and μ⊥ of a monodomain film. Amorphous films possess the lowest mobility of all presumably because of the geometric and energetic disorder. The OFET containing a monodomain glassy-nematic film of F(MB)10F(EH)2 exhibits a field-effect mobility of 0.012 cm2/Vs with an on/off current ratio of 1.0 × 104, a substantial improvement over a monodomain glassy-nematic film of PFO.