Stabilizing Ultrathin CsPbBr₃ Nanoplatelet Films for Deterministic Strong Light-Matter Coupling

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite nanomaterials exhibit promising exciton properties for optoelectronics.
• Instability of perovskite structures hinders practical applications.
• Cesium lead bromide (CsPbBr3) nanoplatelets (NPLs) are key materials with tunable optical properties.

Purpose of the Study:

• To develop a method for stabilizing cesium lead bromide (CsPbBr3) nanoplatelets (NPLs) in spin-casted films.
• To design, fabricate, and characterize exciton cavity polaritons using stabilized CsPbBr3 NPLs.
• To assess the potential of stabilized CsPbBr3 NPLs for solution-processed optoelectronic devices.

Main Methods:

• Spin-casting CsPbBr3 nanoplatelets (NPLs) into thin films.
• Fabrication of Fabry-Perot microresonators.
• Characterization of exciton cavity polaritons formed from CsPbBr3 NPLs.

Main Results:

• A method was successfully developed to stabilize the structure of CsPbBr3 NPLs in spin-casted films.
• Exciton cavity polaritons were formed using stabilized CsPbBr3 NPLs within precisely designed Fabry-Perot microresonators.
• The stabilization method shows promise for enhancing the durability of perovskite nanomaterials.

Conclusions:

• Stabilized CsPbBr3 NPLs can be integrated into Fabry-Perot microresonators to form exciton cavity polaritons.
• The developed stabilization technique is crucial for advancing the use of perovskite nanomaterials in optoelectronics.
• This research paves the way for more robust and reliable solution-processed optoelectronic devices based on perovskite nanoplatelets.