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Carrier Generation and Recombination

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Phonon-Assisted Hot Carrier Generation in Plasmonic Semiconductor Systems.

Yocefu Hattori¹, Jie Meng², Kaibo Zheng^2,3

¹Physical Chemistry Division, Department of Chemistry, Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden.

|January 8, 2021

Summary

Increasing temperature enhances hot electron harvesting in plasmonic semiconductor systems. This improves light-to-charge conversion for photovoltaics and photocatalysis by boosting hot carrier generation via phonon coupling.

Keywords:

Plasmon hot electron phonon coupling ultrafast dynamics

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Area of Science:

Materials Science
Photochemistry
Nanotechnology

Background:

Plasmonic materials efficiently convert light to electrical charges due to their large optical cross sections.
Harvesting plasmon-generated hot carriers is crucial for photovoltaics and photocatalysis.
Hot carrier utilization is limited by ultrafast thermalization in metals.

Purpose of the Study:

To investigate the effect of operating temperature on hot electron generation and transfer in plasmonic semiconductor hybrid systems.
To understand the mechanisms behind temperature-dependent hot carrier dynamics.
To explore strategies for optimizing light-driven energy conversion and chemical synthesis.

Main Methods:

Fabrication of plasmonic semiconductor hybrid systems.
Experimental investigation of hot electron generation and transfer.
Analysis of temperature-dependent optical and electronic properties.
Correlation of hot carrier dynamics with phonon coupling.

Main Results:

Increased operating temperature significantly improves hot electron harvesting in plasmonic semiconductor hybrids.
This enhancement contrasts with typical photodriven processes in nonplasmonic systems.
Phonon coupling appears to enhance hot carrier generation at higher temperatures.

Conclusions:

Operating temperature is a critical parameter for optimizing hot electron transfer in plasmonic hybrid systems.
The findings offer a novel strategy for enhancing efficiency in light-driven energy production and chemical synthesis.
Understanding phonon coupling is key to maximizing hot carrier utilization.