期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 40, 页码 26964-26971出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06241
关键词
organic semiconductors; discotic liquid-crystals; OFETS; SCLC measurements; hole mobility
资金
- Spanish Government MINECO [CTQ2013-40562-R]
- Comunidad de Madrid [S2013/MIT-2740 (PHAMA_2.0)]
- ELIOTRO-PO project [PONO3PE_00092_2]
- MIUR under the PRIN [2012JHFYMC]
- MINECO [CTQ2015-66897]
- Junta de Andalucia [P09-FQM-4708]
- MICINN
The p-type semiconducting properties of a triphenylene-fused triindole mesogen, have been studied by applying two complementary methods which have different alignment requirements. The attachment of only three flexible alkyl chains to the nitrogen atoms of this pi-extended core is sufficient to induce columnar mesomorphism. High hole mobility values (0.65 cm(2) V-1 s(-1)) have been estimated by space-charge limited current (SCLC) measurements in a diode-like structure which are easily prepared from the melt, rendering this material a good candidate for OPVs and OLEDs devices. The mobility predicted theoretically via a hole-hopping mechanism is in very good agreement with the experimental values determined at the SCLC regime. On the other hand the hole mobility determined on solution processed thin transistors (OFETs) is significantly lower, which can be rationalized by the high tendency of these large molecules to align on surfaces with their extended pi-conjugated core parallel to the substrate as demonstrated by SERS. Despite the differences obtained with the two methods, the acceptable performance found on OFETs fabricated by simple drop-casting processing of such an enlarged aromatic core is remarkable and suggests facile hopping between neighboring molecular columns owing to the large conducting/isolating ratio found in this discotic compound.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据