| US 7,521,710 B2 | ||
| Organic thin film transistor | ||
| Hiroaki Nakamura, Chiba (Japan); Masatoshi Saitou, Chiba (Japan); Tetsuo Tsutsui, Fukuoka (Japan); and Takeshi Yasuda, Fukuoka (Japan) | ||
| Assigned to Idemitsu Kosan Co., Ltd., Tokyo (Japan); and Kyusyu University, Fukuoka-shi (Japan) | ||
| Filed on Mar. 08, 2006, as Appl. No. 11/369,862. | ||
| Claims priority of application No. 2006-039683 (JP), filed on Feb. 16, 2006. | ||
| Prior Publication US 2007/0187674 A1, Aug. 16, 2007 | ||
| Int. Cl. H01L 51/30 (2006.01) | ||
| U.S. Cl. 257—40 [257/E51.031] | 8 Claims |
1. A thin film transistor comprising at least three terminals consisting of a gate electrode, a source electrode and a drain
electrode; an insulator layer and an organic semiconductor layer on a substrate, which controls an electric current flowing
between the source and the drain by applying an electric voltage across the gate electrode, wherein the organic semiconductor
layer comprises a styryl compound represented by a following general formula (a):
 wherein R1, R2, R4, R5, R14, R15, R17, and R18 each independently represents a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 30 carbon atoms,
a haloalkyl group having 1 to 30 carbon atoms, an alkoxyl group having 1 to 30 carbon atoms, a haloalkoxyl group having 1
to 30 carbon atoms, an alkylthio group having 1 to 30 carbon atoms, a haloalkylthio group having 1 to 30 carbon atoms, an
alkylamino group having 1 to 30 carbon atoms, a dialkylamino group having 2 to 60 carbon atoms, wherein alkyl groups of the
dialkylamino group do not bond to each other, or bond to each other to form a ring structure containing a nitrogen atom, an
alkylsulfonyl group having 1 to 30 carbon atoms, a haloalkylsulfonyl group having 1 to 30 carbon atoms, all of those have
or do not have a substituent;
R3 and R16 represent the same groups and are a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 30 carbon atoms,
a haloalkyl group having 1 to 30 carbon atoms, an alkoxyl group having 1 to 30 carbon atoms, a haloalkoxyl group having 1
to 30 carbon atoms, an alkylthio group having 1 to 30 carbon atoms, a haloalkylthio group having 1 to 30 carbon atoms, an
alkylamino group having 1 to 30 carbon atoms, a dialkylamino group having 2 to 60 carbon atoms, wherein alkyl groups of the
dailkylamino group do not bond to each other, or bond to each other to form a ring structure containing a nitrogen atom, an
alkylsulfonyl group having 1 to 30 carbon atoms, or a haloalkylsulfonyl group having 1 to 30 carbon atoms, all of those may
have a substituent;
R6 to R13 each independently represents a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 30 carbon atoms,
a haloalkyl group having 1 to 30 carbon atoms, an alkoxyl group having 1 to 30 carbon atoms, a haloalkoxyl group having 1
to 30 carbon atoms, an alkylthio group having 1 to 30 carbon atoms, a haloalkylthio group having 1 to 30 carbon atoms, an
alkylamino group having 1 to 30 carbon atoms, a dialkylamino group having 2 to 60 carbon atoms wherein alkyl groups of the
dialkylamino group do not bond to each other, or bond to each other to form a ring structure containing a nitrogen atom, an
alkylsulfonyl group having 1 to 30 carbon atoms, or a haloalkylsulfonyl group having 1 to 30 carbon atoms, all of those may
have a substituent;
R19to R22each independently represents a hydrogen atom,a halogen a cyano group, an alkyl group having 1 to 6 carbon atoms, a haloalkyl
group having 1 to 6 carbon atoms, an alkoxyl group having 1 to 6 carbon atoms, a haloakoxyl group having 1 to 6 carbon atoms,
an alkylthio group having 1 to 6 carbon atoms, a haloalkylthio group having 1 to 6 carbon atoms, an alkylamino group having
1 to 6 carbon atoms, a dialkylamino group having 2 to 12 carbon atoms wherein alkyl groups of the dialkylamino group do not
bond to each other, or bond to each other to form a ring structure containing a nitrogen atom, an alkylsulfonyl group having
1 to 6 carbon atoms, or a haloalkylsufonyl group having 1 to 6 carbon atoms, all of those may have a substituent; and
l, m and n each represents an integer of 0 to 10; and a sum of l+m+n makes an integer of 2 to 20.
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