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Related Experiment Video

Updated: Mar 12, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Published on: July 21, 2018

Plasmon-Exciton Interaction Induced Efficient Charge Separation in Cu_2-xS-CsPbBr₃ Heterostructure.

Nitika Kharbanda¹, Manvi Sachdeva¹, Ayushi Shukla¹

¹Institute of Nano Science and Technology, Mohali, Punjab, India.

Small (Weinheim an Der Bergstrasse, Germany)

|March 11, 2026

Summary

Non-stoichiometric copper sulfide (Cu_2-xS) and cesium lead bromide (CsPbBr₃) heterostructures show enhanced light absorption and charge transfer for optoelectronic devices. This study reveals synergistic charge transfer mechanisms improving performance.

Keywords:

charge separation heterostructure hot carrier transfer semiconductor plasmonics transient absorption spectroscopy

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Area of Science:

Materials Science
Nanotechnology
Photovoltaics

Background:

Non-stoichiometric plasmonic semiconductors like Cu_2-xS offer tunable band gaps and NIR light harvesting for energy conversion.
Integrating Cu_2-xS with lead halide perovskites (e.g., CsPbBr₃) creates heterostructures with strong plasmon-exciton coupling, enhancing light absorption and charge transfer.

Purpose of the Study:

To synthesize and spectroscopically investigate non-stoichiometric Cu_2-xS, CsPbBr₃ nanocrystals (NCs), and their heterostructures.
To understand hot carrier dynamics and extraction within the Cu_2-xS-CsPbBr₃ heterosystem using femtosecond transient absorption spectroscopy.

Main Methods:

Synthesis of Cu_2-xS and CsPbBr₃ nanocrystals.
Fabrication of Cu_2-xS-CsPbBr₃ heterostructures.
Femtosecond transient absorption (TA) spectroscopy with 400 nm and 800 nm excitations.

Main Results:

TA measurements confirmed plasmon-induced hot-hole transfer from Cu_2-xS to CsPbBr₃ valence band at both excitation wavelengths.
400 nm excitation additionally induced hot-electron transfer from CsPbBr₃ to Cu_2-xS conduction band.
These synergistic charge transfer processes led to efficient charge separation and suppressed exciton recombination.

Conclusions:

The Cu_2-xS-CsPbBr₃ heterosystem exhibits efficient charge separation and retarded exciton recombination due to synergistic charge transfer mechanisms.
This heterosystem demonstrates significant potential for high-performance optoelectronic devices, leveraging plasmonic and perovskite properties.