Fabrication and characterization of p+-i-p+ type organic thin film transistors with electrodes of highly doped polymer

Daisuke Tadaki, Teng Ma, Jinyu Zhang, Shohei Iino, Ayumi Hirano-Iwata, Yasuo Kimura, Richard A. Rosenberg, Michio Niwano

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Organic thin film transistors (OTFTs) have been explored because of their advantageous features such as light-weight, flexible, and large-area. For more practical application of organic electronic devices, it is very important to realize OTFTs that are composed only of organic materials. In this paper, we have fabricated p+-i-p+ type of OTFTs in which an intrinsic (i) regioregular poly (3-hexylthiophene) (P3HT) layer is used as the active layer and highly doped p-type (p+) P3HT is used as the source and drain electrodes. The 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) was used as the p-type dopant. A fabricating method of p+-i-p+ OTFTs has been developed by using SiO2 and aluminum films as capping layers for micro-scaled patterning of the p+-P3HT electrodes. The characteristics of the OTFTs were examined using the photoelectron spectroscopy and electrical measurements. We demonstrated that the fabricated p+-i-p+ OTFTs work with carrier injection through a built-in potential at p+/i interfaces. We found that the p+-i-p+ OTFTs exhibit better FET characteristics than the conventional P3HT-OTFT with metal (Au) electrodes, indicating that the influence of a carrier injection barrier at the interface between the electrode and the active layer was suppressed by replacing the metal electrodes with p+-P3HT layers.

Original languageEnglish
Article number154503
JournalJournal of Applied Physics
Issue number15
Publication statusPublished - 2016 Apr 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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