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Rectification Behavior on Polyelectrolyte-Modified Flexible ITO Electrode via Ionic Charge-Selective Electron
Bingchen Li1, Xuxian Zhao1, Zhe Sun1
1Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry , Tianjin University of Technology , No. 391 Binshui Xidao , Xiqing District Tianjin 300384 , P. R. China.
ACS Applied Materials & Interfaces
|October 16, 2019
Summary
Researchers developed a novel flexible diode by combining ionic and molecular properties. This system uses redox species on modified electrodes, achieving current rectification for advanced electronic applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Molecular and ionic diodes offer potential for downscaled electronic devices, ionic circuits, and biological systems.
- Existing diode types face limitations, motivating the development of improved, scalable systems.
- Current rectification is crucial for electronic device functionality.
Purpose of the Study:
- To propose a novel system integrating advantages of ionic and single-molecule diodes while mitigating their disadvantages.
- To demonstrate a simple, scalable method for creating flexible current rectification devices.
- To investigate ionic charge-selective electron transfer for rectification behavior.
Main Methods:
- Fabrication of flexible current rectification devices using polyelectrolyte multilayer (PEM)-modified indium tin oxide (ITO) electrodes.
- Utilizing an electrolytic solution containing redox species, specifically ferrocyanide (Fe(CN)63-) and hexaamineruthenium(III) (Ru(NH3)63+).
- Formation of an ionic bilayer on a charge-selective ITO surface via Coulombic interactions, mimicking a molecular diode's monolayer.
Main Results:
- The proposed system exhibits rectification behavior driven by ionic charge-selective electron transfer.
- Flexible diodes were successfully prepared using bare and PEM-modified plastic ITO electrodes.
- Rectification ratio (RR) was enhanced from approximately 6 to 10 by incorporating conducting polymers into the PEMs.
Conclusions:
- The study presents a promising system that merges ionic and molecular diode functionalities.
- The developed method offers a simple and scalable approach to flexible electronic devices.
- Enhanced rectification ratios were achieved through tailored PEM construction, paving the way for advanced applications.
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