Near-Infrared plasmon induced hot electron extraction evidence in an indium tin oxide nanoparticle / monolayer molybdenum disulphide heterostructure

TL;DR

This study demonstrates plasmon-induced hot electron transfer in an indium tin oxide nanoparticle and monolayer molybdenum disulphide heterostructure using ultrafast spectroscopy at near-infrared wavelengths, indicating potential for photoconversion applications.

Contribution

First experimental evidence of near-infrared plasmonic hot electron extraction in ITO/MoS2 heterostructures using ultrafast differential transmission spectroscopy.

Findings

Observation of excitonic features in MoS2 upon IR excitation

Charge transfer between ITO nanocrystals and MoS2 upon plasmon excitation

Potential for near-infrared plasmonic photoconversion

Abstract

In this work, we observe plasmon induced hot electron extraction in a heterojunction between indium tin oxide nanocrystals and monolayer molybdenum disulphide. We study the sample with ultrafast differential transmission exciting the sample at 1750 nm where the intense localized plasmon surface resonance of the indium tin oxide nanocrystals is and where the monolayer molybdenum disulphide does not absorb light. With the excitation at 1750 nm we observe the excitonic features of molybdenum disulphide in the visible range, close to the exciton of molybdenum disulphide. Such phenomenon can be ascribed to a charge transfer between indium tin oxide nanocrystals and monolayer molybdenum disulphide upon plasmon excitation. These results are a first step towards the implementation of near infrared plasmonic materials for photoconversion.