Wet Chemical Method for Black Phosphorus Thinning and Passivation

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Layered black phosphorus (BP) shows promise for electronics and optoelectronics.
• Challenges exist in mass-fabricating air-stable BP, hindering industrial use.

Purpose of the Study:

• To develop an all-solution-based method for mass production of air-stable layered BP.
• To improve the environmental stability and performance of BP-based devices.

Main Methods:

• Chemical modification of BP using 2,2,6,6-tetramethylpiperidinyl- N-oxyl (TEMPO) and triphenylcarbenium tetrafluoroborate ([Ph3C]BF4).
• Thinning and passivation of BP flakes in an organic solvent.
• Fabrication of field-effect transistors and photodetectors using modified BP.

Main Results:

• Achieved all-solution-based mass production of air-stable layered BP.
• BP-based devices demonstrated enhanced performance and stability up to 4 months.
• Fabricated a proof-of-concept air-stable p-type BP thin-film transistor.

Conclusions:

• The novel chemical modification method enables scalable production of stable BP.
• This approach significantly improves the prospects of BP for industrial applications.