Fabrication and electrical characteristics of organic thin film transistor using π-conjugated dendrimer

Mi Yeon Cho, Han Saem Kang, Kihyun Kim, Su Jin Kim, Jinsoo Joo, Kyung Hwan Kim, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We fabricated organic thin film transistors (OTFTs) by using soluble π-conjugated dendrimers of 4(HPBT)-benzene, 4(HPTT)-benzene, and 4(HPDTT)-benzene. Electrical characteristics such as current-voltage characteristic curves and their temperature dependence were measured for the dendrimer-based OTFT devices. The active layer using planar π-conjugated dendrimers was spin-coated, and thermally grown silicon dioxide layer was used as a dielectric layer. Through the measurements of source-drain currents with varying gate voltages, we obtained charge carrier mobility (μ), on/off current ratio (Ion/off), and threshold voltage (Vth). The 4(HPBT)-benzene and 4(HPTT)-benzene-based OTFT devices showed that the μ's were ∼6.2 × 10-3 cm2/V s and ∼1.9 × 10-3 cm2/V s, respectively. We measured temperature-dependent mobility and activation energy (Ea) of the dendrimer-based OTFTs by using Arrhenius fitting. The Ea's of 4(HPTT)-benzene and 4(HPDTT)-benzene-based OTFTs were estimated to be ∼0.39 eV and ∼0.13 eV, respectively. In case of 4(HPBT)-benzene-based OTFT, two trap levels were measured and the Ea's were estimated to be ∼0.027 eV and ∼0.22 eV.

Original languageEnglish
Pages (from-to)431-434
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume313-314
DOIs
Publication statusPublished - 2008 Feb 1

Fingerprint

Dendrimers
dendrimers
Thin film transistors
Benzene
transistors
benzene
Fabrication
fabrication
thin films
Drain current
Carrier mobility
electric potential
Current voltage characteristics
carrier mobility
Charge carriers
Threshold voltage
Silicon Dioxide
threshold voltage
charge carriers
Activation energy

Keywords

  • Dendrimer
  • Mobility
  • Organic thin film transistor

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Fabrication and electrical characteristics of organic thin film transistor using π-conjugated dendrimer. / Cho, Mi Yeon; Kang, Han Saem; Kim, Kihyun; Kim, Su Jin; Joo, Jinsoo; Kim, Kyung Hwan; Cho, Min Ju; Choi, Dong Hoon.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 313-314, 01.02.2008, p. 431-434.

Research output: Contribution to journalArticle

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