Localized Surface Plasmon Resonance Enhanced Light Absorption in AuCu/CsPbCl₃ Core/Shell Nanocrystals

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Localized surface plasmon resonance (LSPR) enhances light absorption in photonic and optoelectronic devices.
• All-inorganic perovskite nanocrystals (PNCs) offer unique advantages for optoelectronics.

Purpose of the Study:

• To achieve colloidal synthesis of AuCu/CsPbCl3 core/shell PNCs.
• To investigate the LSPR effect on light absorption in PNCs.
• To enhance the photoresponse of PNC-based photodetectors.

Main Methods:

• Colloidal synthesis of AuCu/CsPbCl3 core/shell PNCs.
• Characterization of PNCs' optical properties and dimensions.
• Fabrication and testing of PNCs/graphene nanohybrid photodetectors.

Main Results:

• Successful synthesis of AuCu/CsPbCl3 core/shell PNCs with a 7.1 nm AuCu core and 2-4 nm CsPbCl3 shell.
• Observed enhanced light absorption in the CsPbCl3 shell due to LSPR from the AuCu core.
• Achieved over a 30-fold increase in photoresponse in nanohybrid photodetectors.

Conclusions:

• LSPR can be effectively implemented in core/shell PNCs for enhanced light trapping.
• AuCu/CsPbCl3 core/shell PNCs show significant potential for high-performance optoelectronic applications.
• This approach offers a feasible pathway for developing advanced photodetectors.