Efficient Charge Transfer From CsPbBr₃ Nanocrystals to Free Base Tricyanophenyl Corroles

Area of Science:

• Materials Science
• Nanotechnology
• Photophysics

Background:

• Lead halide perovskite nanocrystals (NCs) exhibit promising optoelectronic properties.
• Understanding exciton dynamics and charge transfer is crucial for their applications.

Purpose of the Study:

• Investigate efficient charge transfer between CsPbBr3 NCs and 5,10,15-tris(4-cyanophenyl)corrole (TCPC).
• Analyze the impact of charge transfer on photoluminescence (PL) properties and exciton dynamics.

Main Methods:

• Photoluminescence (PL) spectroscopy
• Time-resolved spectroscopy (UTAS)
• X-ray Photoelectron Spectroscopy (XPS)
• Ultraviolet Photoelectron Spectroscopy (UPS)
• Absolute photoluminescence quantum yield (PLQY) measurements

Main Results:

• TCPC effectively extracts holes from CsPbBr3 NCs, causing significant PL quenching.
• PL quenching results from a combination of static and dynamic mechanisms.
• Charge transfer occurs without observable degradation of the perovskite NCs, confirmed by optical and structural analyses.

Conclusions:

• Efficient hole transfer from CsPbBr3 NCs to TCPC is demonstrated.
• The study elucidates the mechanisms behind PL quenching in perovskite NCs during charge transfer.
• Findings confirm the stability of perovskite NCs under these charge transfer conditions.