Ultrathin regioregular poly(3-hexyl thiophene) field-effect transistors

Henrik G. O. Sandberg (Corresponding Author), Gitti L. Frey (Corresponding Author), Maxim N. Shkunov (Corresponding Author), Henning Sirringhaus, Richard H. Friend, Martin Meedom Nielsen, Christian Kumpf

Research output: Contribution to journalArticleScientificpeer-review

148 Citations (Scopus)

Abstract

Ultrathin films of regioregular poly(3-hexyl thiophene) (RR-P3HT) were deposited through a dip-coating technique and utilized as the semiconducting film in field-effect transistors (FETs). Proper selection of the substrate and solution concentration enabled the growth of a monolayer-thick RR-P3HT film. Atomic force microscopy (AFM), U-V-vis absorption spectroscopy, X-ray reflectivity, and grazing incidence diffraction were used to study the growth mechanism, thickness and orientation of self-organized monolayer thick RR-P3HT films on SiO2 surfaces. Films were found to adopt a Stranski-Krastanov-type growth mode with formation of a very stable first monolayer. X-ray measurements show that the direction of pi-stacking in the films (the (010) direction) is parallel to the substrate, which is the preferred orientation for high field-effect carrier mobilities. The field-effect mobilities in all ultrathin films prepared in this study are lower than those obtained for thicker films spun on similar substrates. However, monolayer FETs provide a direct experimental system to study the charge transport at the charge accumulation layer.
Original languageEnglish
Pages (from-to)10176-10182
JournalLangmuir
Volume18
Issue number26
DOIs
Publication statusPublished - 1 Dec 2002
MoE publication typeA1 Journal article-refereed

Keywords

  • CHARGE,CIRCUITS,CONJUGATED POLYMERS,CRYSTALS,HIGH,HIGH-MOBILITY,LANGMUIR-BLODGETT-FILMS,OLIGOTHIOPHENES,RESOLUTION

Fingerprint Dive into the research topics of 'Ultrathin regioregular poly(3-hexyl thiophene) field-effect transistors'. Together they form a unique fingerprint.

  • Cite this

    Sandberg, H. G. O., Frey, G. L., Shkunov, M. N., Sirringhaus, H., Friend, R. H., Nielsen, M. M., & Kumpf, C. (2002). Ultrathin regioregular poly(3-hexyl thiophene) field-effect transistors. Langmuir, 18(26), 10176-10182. https://doi.org/10.1021/la0261444