Polyelectrolyte interlayer for ultra-sensitive organic transistor humidity sensors

Yeong Don Park, Boseok Kang, Ho Sun Lim, Kilwon Cho, Moon Sung Kang, Jeong Ho Cho

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We demonstrate low-voltage, flexible, transparent pentacene humidity sensors with ultrahigh sensitivity, good reliability, and fast response/recovery behavior. The excellent performances of these devices are derived from an inserted polyelectrolyte (poly[2-(methacryloyloxy)ethyltrimethylammonium chloride-co-3-(trimethoxysilyl)propyl methacrylate] (poly(METAC-co-TSPM)) interlayer, which releases free Cl - ions in the electrolyte dielectric layer under humid conditions and boosts the electrical current in the transistor channel. This has led to extreme device sensitivity, such that electrical signal variations exceeding 7 orders of magnitude have been achieved in response to a 15% change in the relative humidity level. The new sensors exhibit a fast responsivity and a stable performance toward changes in humidity levels. Furthermore, the humidity sensors, mounted on flexible substrates, provided low voltage (<5 V) operation while preserving the unique ultrasensitivity and fast responsivity of these devices. We believe that the strategy of utilizing the enhanced ion motion in an inserted polyelectrolyte layer of an OFET structure can potentially improve sensor technologies beyond humidity-responsive systems.

Original languageEnglish
Pages (from-to)8591-8596
Number of pages6
JournalACS Applied Materials and Interfaces
Volume5
Issue number17
DOIs
Publication statusPublished - 2013 Sep 11

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Humidity sensors
Polyelectrolytes
Atmospheric humidity
Transistors
Ions
Organic field effect transistors
Sensors
Electric potential
Electrolytes
Chlorides
Recovery
Substrates

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Park, Yeong Don ; Kang, Boseok ; Lim, Ho Sun ; Cho, Kilwon ; Kang, Moon Sung ; Cho, Jeong Ho. / Polyelectrolyte interlayer for ultra-sensitive organic transistor humidity sensors. In: ACS Applied Materials and Interfaces. 2013 ; Vol. 5, No. 17. pp. 8591-8596.
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Polyelectrolyte interlayer for ultra-sensitive organic transistor humidity sensors. / Park, Yeong Don; Kang, Boseok; Lim, Ho Sun; Cho, Kilwon; Kang, Moon Sung; Cho, Jeong Ho.

In: ACS Applied Materials and Interfaces, Vol. 5, No. 17, 11.09.2013, p. 8591-8596.

Research output: Contribution to journalArticle

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