Liquid-crystalline rigid-core semiconductor oligothiophenes: Influence of molecular structure on phase behaviour and thin-film properties

被引：70

作者：

Melucci, Manuela ^{[1
]}

Favaretto, Laura ^{[1
]}

Bettini, Christian ^{[1
]}

Gazzano, Massimo ^{[1
]}

Camaioni, Nadia ^{[1
]}

Maccagnani, Piera ^{[2
]}

Ostoja, Paolo ^{[2
]}

Monari, Magda ^{[3
]}

Barbarella, Giovanna ^{[1
]}

机构：

[1] CNR, CNR ISOF, I-40129 Bologna, Italy

[2] CNR, Ist Microelettron & Microsistemi, I-40129 Bologna, Italy

[3] Univ Bologna, Dipartimento Chim G Ciamician, I-40126 Bologna, Italy

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2007年 / 13卷 / 36期

关键词：

liquid crystals; oligothiophenes; self-assembly; semiconductors; thin films; CARRIER MOBILITY; CHARGE-TRANSPORT; THIOPHENE; FIELD; ALPHA; DERIVATIVES; TRANSISTORS; OLIGOMERS;

D O I：

10.1002/chem.200701368

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The design, synthesis and properties of liquid-crystalline semiconducting oligothiophenes containing dithienothiophene (DTT), benzothiadiazole (BTZ) and carbazole (CBZ) rigid cores are described. The effect of molecular structure (shape, size and substitution) on their thermal behaviour and electrical properties has been investigated. Polarised optical microscopy (POM) and differential scanning calorimetry (DSC) analyses have revealed highly ordered smectic mesophases for most of the newly synthesised compounds. X-ray diffraction (XRD) studies performed at various temperatures have shown that the smectic order is retained in the crystalline state upon cooling across the transition temperature, affording cast films with a more favourable morphology for FET applications.

引用

页码：10046 / 10054

页数：9

共 54 条

[1] FAST PHOTOCONDUCTION IN THE HIGHLY ORDERED COLUMNAR PHASE OF A DISCOTIC LIQUID-CRYSTAL [J].