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Charge Injection Engineering of Ambipolar Field-Effect Transistors for High-Performance Organic Complementary Circuits
- Source :
- ACS Applied Materials & Interfaces. 3:3205-3214
- Publication Year :
- 2011
- Publisher :
- American Chemical Society (ACS), 2011.
-
Abstract
- Ambipolar π-conjugated polymers may provide inexpensive large-area manufacturing of complementary integrated circuits (CICs) without requiring micro-patterning of the individual p- and n-channel semiconductors. However, current-generation ambipolar semiconductor-based CICs suffer from higher static power consumption, low operation frequencies, and degraded noise margins compared to complementary logics based on unipolar p- and n-channel organic field-effect transistors (OFETs). Here, we demonstrate a simple methodology to control charge injection and transport in ambipolar OFETs via engineering of the electrical contacts. Solution-processed caesium (Cs) salts, as electron-injection and hole-blocking layers at the interface between semiconductors and charge injection electrodes, significantly decrease the gold (Au) work function (∼4.1 eV) compared to that of a pristine Au electrode (∼4.7 eV). By controlling the electrode surface chemistry, excellent p-channel (hole mobility ∼0.1-0.6 cm(2)/(Vs)) and n-channel (electron mobility ∼0.1-0.3 cm(2)/(Vs)) OFET characteristics with the same semiconductor are demonstrated. Most importantly, in these OFETs the counterpart charge carrier currents are highly suppressed for depletion mode operation (I(off)70 nA when I(on)0.1-0.2 mA). Thus, high-performance, truly complementary inverters (high gain50 and high noise margin75% of ideal value) and ring oscillators (oscillation frequency ∼12 kHz) based on a solution-processed ambipolar polymer are demonstrated.
- Subjects :
- Electron mobility
Materials science
Transistors, Electronic
Polymers
business.industry
Ambipolar diffusion
Transistor
Carbonates
Cesium
Microscopy, Atomic Force
Electrical contacts
law.invention
Semiconductor
law
Electrode
Optoelectronics
General Materials Science
Field-effect transistor
Work function
Gold
Organic Chemicals
business
Electrodes
Subjects
Details
- ISSN :
- 19448252 and 19448244
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- ACS Applied Materials & Interfaces
- Accession number :
- edsair.doi.dedup.....fa2d207a13d5399fe02a1ad2e300c9ed