Broadband Optical Enhancement in Strongly Coupled Perovskite-PbS Nanostructures

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Perovskite nanoparticles offer tunable optoelectronic properties.
• Extending absorbance to the near-infrared (NIR) is crucial for advanced applications.
• Conjugating dissimilar semiconductors often requires lattice matching.

Purpose of the Study:

• To develop hybrid nanostructures with extended absorbance into the NIR region.
• To investigate charge transfer dynamics between conjugated nanoparticles.
• To demonstrate a method for conjugating dissimilar semiconductors without lattice matching.

Main Methods:

• Synthesis of PbS and CsPbBr3 nanoparticles conjugated via a PbSO4 matrix.
• Optical characterization including photoluminescence quantum yield (PLQY) measurements.
• Temperature-dependent time-resolved photoluminescence spectroscopy.
• Surface photovoltage and ambient photoemission spectroscopy.

Main Results:

• Hybrid nanostructures exhibited optical responses from visible to NIR.
• Achieved a total photoluminescence quantum yield (PLQY) of 66%.
• Demonstrated efficient charge transfer from CsPbBr3 to PbS nanoparticles.
• Constructed an energy-level diagram confirming strong semiconductor coupling.

Conclusions:

• The PbSO4 matrix facilitates the formation of well-organized nanorods for close NP proximity.
• Efficient charge transfer and strong coupling were confirmed between CsPbBr3 and PbS NPs.
• This hybrid approach provides a versatile strategy for conjugating dissimilar semiconductors.