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Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

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A solution state diode using semiconductor polymer nanorods with nanogap electrodes.

Senol Mutlu¹, Bedri Gurkan Sonmez

¹Department of Electrical and Electronics Engineering, Bogazici University, 34342, Istanbul, Turkey. senol.mutlu@boun.edu.tr

|May 30, 2012

Summary

Researchers developed a novel polymer diode using regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) in solution. This design significantly enhances charge carrier mobility, achieving high current density and improving performance over solid-state diodes.

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Area of Science:

Materials Science
Organic Electronics
Semiconductor Physics

Background:

Organic polymer diodes are crucial for flexible electronics.
Previous solid-state designs faced limitations in charge carrier mobility due to chain entanglement and hopping.
Regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) is a promising semiconducting polymer.

Purpose of the Study:

To fabricate and characterize a solution-state polymer diode using P3HT.
To investigate the effect of electrode separation on charge transport mechanisms.
To optimize P3HT concentration for enhanced device performance and mobility.

Main Methods:

Fabrication of a polymer diode with highly doped p-type silicon and aluminum electrodes separated by a 40 nm gap.
Utilization of a regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT):dichlorobenzene solution as the semiconductor layer.
Measurement of degradation over time and hysteresis effects.
Systematic variation of P3HT solution concentration.

Main Results:

The solution-state diode design enables intra-chain charge carrier transfer, preventing inter-chain hopping and entanglement.
An optimal P3HT concentration of 6 mg ml(-1) was determined.
A high current density of at least 300 mA cm(-2) was achieved.

Conclusions:

The solution-state polymer diode architecture significantly enhances carrier mobility.
This approach offers at least a six-fold improvement in carrier mobility compared to solid-state P3HT diodes.
The findings pave the way for more efficient organic electronic devices.