Tuning electron transport in graphene-based field-effect devices using block co-polymers.

Area of Science:

• Materials Science
• Nanoscience
• Condensed Matter Physics

Background:

• Graphene exhibits exceptional electronic properties, making it a promising material for advanced nanoelectronic devices.
• Controlling graphene's electronic properties, particularly through doping, is crucial for applications like graphene-based field-effect transistors (GFETs).

Purpose of the Study:

• To investigate a method for spatially controlled doping of GFETs.
• To demonstrate the modulation of GFET electronic properties using plasma-assisted techniques on block co-polymers.

Main Methods:

• Utilized spatially controlled plasma-assisted CF(4) doping.
• Employed a polycrystalline PS-P4VP block co-polymer (poly(styrene-b-4-vinylpyridine)) with cylindrical morphology on GFETs.
• Investigated the differential sensitivity of polystyrene (PS) and poly(4-vinylpyridine) (P4VP) domains to CF(4) plasma.

Main Results:

• Successfully controlled the Dirac point shift in GFETs by applying CF(4) plasma to the BCP layer.
• Demonstrated that the doping effect can be tuned by altering the chemical composition of the microdomains (P4VP) and major domains (PS).
• Showcased the ability to achieve controlled doping by exploiting the varying sensitivities of PS and P4VP to plasma processing.

Conclusions:

• Developed a methodology for precise control over the Dirac point in GFETs.
• The differential plasma sensitivity of block co-polymer components offers a pathway for targeted graphene doping.
• This technique enables tailored electronic property modulation for graphene-based nanoelectronics.