High conductivity organic thin films for spintronics: the interface resistance bottleneck.

Area of Science:

• Materials Science
• Organic Electronics
• Condensed Matter Physics

Background:

• Poly(2,5-bis(3-dodecyl-2-yl)-thieno[3,2-b]thiophene) (pBTTT) is a promising organic semiconductor.
• High conductivity in doped pBTTT suggests potential for electronic applications.

Purpose of the Study:

• Investigate the transport properties of highly electrochemically doped pBTTT thin films.
• Determine the suitability of pBTTT for spin valve device integration.
• Identify factors limiting spin current collection in organic spin valves.

Main Methods:

• Electrochemical doping of pBTTT thin films.
• Electrical conductivity measurements.
• Analysis of transport properties and interface resistance.

Main Results:

• pBTTT films achieved high conductivities (3000-5000 Ω(-1) cm(-1)).
• Evidence of delocalized transport and near-metallic behavior was observed.
• Interface resistance between pBTTT and metallic electrodes was significantly higher than expected spin resistance.

Conclusions:

• High interface resistance is a critical bottleneck for spin current collection in pBTTT-based devices.
• This finding explains the lack of success in reported lateral organic spin valves.
• Further research is needed to overcome interface resistance for efficient organic spintronics.