Specifications

2 College of Science and Technology, Nihon University, Funabashi, Chiba 274-8501, Japan
Source title: Japanese Journal of Applied Physics
Abbreviated source title: Jpn. J. Appl. Phys.
Volume: 52
Issue: 3 PART 2
Monograph title: Active-Matrix Flatpanel Displays and Devices - TFT Technologies and FPD
Materials
Issue date: March 2013
Publication year: 2013
Article number: 03BB07
Language: English
ISSN: 00214922
E-ISSN: 13474065
Document type: Journal article (JA)
Publisher: Japan Society of Applied Physics, 1-12-3 Kudan-Kita,k Chiyoda-ku, Tokyo, 102, Japan
Abstract: Two phenylene-thiophene oligomer derivatives, 2,8-bis[5-(4-n-hexylphenyl)-
2-thienyl]dibenzothiophene (28HPTDBT) and 3,7-bis[5-(4-nhexylphenyl)-
2-thienyl]dibenzothiophene (37HPTDBT), were used as active materials in thin-film organic
field-effect transistors (OFETs). Although the two molecules have similar structures, they
exhibited obvious differences in photophysical, crystal, φ-stacking, and electrical properties.
28HPTDBT is an amorphous material and hence showed no semiconductor characteristics in its
thin-film OFETs, while 37HPTDBT exhibited high crystallinity and strong φ-stacking in the solid
state, thus resulting in high charge carrier mobilities. The effects of gate insulators and annealing
treatment on transistor performances were also investigated. Thin-film OFETs based on
37HPTDBT with an octadecanyltrichlorosilane (OTS)-treated SiO2 gate insulator exhibited
excellent field-effect performances with a maximum mobility of 0.3 cm2 V-1 s-1 and a high
Ion=Ioff current ratio of 1:5 × 10. Although annealing treatment improved the crystallinity of the
thin films, the appearance of voids (cracks) resulted in a decrease in the charge carrier mobilities
in the OFETs. © 2013 The Japan Society of Applied Physics.
Number of references: 26
Main heading: Thin film transistors
Controlled terms: Carrier mobility - Display devices - Electric properties - Oligomers
- Organic field effect transistors - Thiophene
Uncontrolled terms: Active material - Annealing treatments - Crystallinities - Current
ratios - Dibenzothiophenes - High crystallinity - Organic field-effect transistor (OFETs)
- Transistor performance
Classification code: 701.1 Electricity: Basic Concepts and Phenomena - 714.2
Semiconductor Devices and Integrated Circuits - 722.2 Computer Peripheral Equipment -
804 Chemical Products Generally - 804.1 Organic Compounds - 933 Solid State Physics
DOI: 10.7567/JJAP.52.03BB07
Database: Compendex
Compilation and indexing terms, © 2013 Elsevier Inc.
3.
Accession number: 20131916321804