Editable Light Response in Halide Perovskites Encapsulated within Single-Walled Carbon Nanotubes

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• One-dimensional (1D) perovskite heterostructures offer unique properties but face challenges in device integration.
• Separation of semiconductor single-walled carbon nanotubes (s-SWCNTs) after perovskite encapsulation hinders applications.

Purpose of the Study:

• To create 1D perovskite heterostructures with editable photoresponse using CsPbBr3 encapsulated in s-SWCNTs (CPB@s-SWCNTs).
• To address the s-SWCNT separation issue and explore the resulting electronic and optoelectronic properties.

Main Methods:

• Fabrication of 1D perovskite heterostructures via a template method.
• Characterization using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM).
• Electronic property analysis using density functional theory (DFT) and Kelvin probe force microscopy (KPFM).

Main Results:

• Successfully fabricated and verified CPB@s-SWCNTs with separated s-SWCNTs.
• Observed a significant n-doping effect and weak negative photoresponse due to electron transfer (0.61 e per SWCNT unit cell).
• Demonstrated editable photoresponse in GaN wafer devices, including enhanced negative and asymmetric positive responses.

Conclusions:

• Developed a strategy for fabricating large-area s-SWCNT films filled with perovskite materials.
• Overcame key challenges in 1D heterostructure integration, paving the way for advanced optoelectronic devices.
• Broadened the application scope of 1D van der Waals heterostructures in optoelectronics.