Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Direct and Indirect Interfacial Electron Transfer at a Plasmonic p-Cu7S4/CdS Heterojunction

Journal Article · · ACS Nano
Plasmonic semiconductors exhibit significant potential for harvesting near-IR solar energy, although their mechanisms of plasmon-induced hot electron transfer (HET) are poorly understood. We report a transient absorption study of plasmon-induced HET in p-Cu7S4/CdS type II heterojunctions. Near-IR excitation of the p-Cu7S4 plasmon band at ~1400 nm leads to ultrafast HET into the CdS conduction band with a time constant of <150 fs and a quantum efficiency of ~0.054%. The injected hot electrons remain in CdS with an amplitude-weighted average lifetime of 1.9 ± 0.5 ns, significantly longer than that in Au/CdS heterostructures, suggesting that plasmonic semiconductors can slow down charge recombination due to the presence of a bandgap. The excited near-IR plasmon does not decay by coupling to the interfacial charge transfer transition, likely due to its energy mismatch. This study provides a detailed mechanistic understanding and possible directions for improving plasmonic HET in plasmonic semiconductor heterojunctions.
Research Organization:
Emory University, Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008798
OSTI ID:
2500392
Alternate ID(s):
OSTI ID: 2500320
Journal Information:
ACS Nano, Journal Name: ACS Nano Journal Issue: 1 Vol. 19; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (51)

Gradient Type‐II CdSe/CdSeTe/CdTe Core/Crown/Crown Heteronanoplatelets with Asymmetric Shape and Disproportional Excitonic Properties journal January 2023
Tuning plasmonic p–n junction for efficient infrared-light-responsive hydrogen evolution journal December 2022
Directional Damping of Plasmons at Metal–Semiconductor Interfaces journal June 2022
Exciton Spatial Coherence and Optical Gain in Colloidal Two-Dimensional Cadmium Chalcogenide Nanoplatelets journal August 2019
Reversible Crystal Phase Interconversion between Covellite CuS and High Chalcocite Cu2S Nanocrystals journal May 2017
Charge Transfer from Quantum-Confined 0D, 1D, and 2D Nanocrystals journal April 2024
Surface-Plasmon-Driven Hot Electron Photochemistry journal November 2017
Localized Surface Plasmon Resonance in Semiconductor Nanocrystals journal February 2018
Plasmonic Copper Sulfide-Based Materials: A Brief Introduction to Their Synthesis, Doping, Alloying, and Applications journal May 2017
Physical Origins of the Transient Absorption Spectra and Dynamics in Thin-Film Semiconductors: The Case of BiVO 4 journal August 2018
Ultrafast Plasmon Dynamics and Hole–Phonon Coupling in NIR Active Nonstoichiometric Semiconductor Plasmonic Cu2–xS Nanocrystals journal October 2019
Direct Interfacial Charge Transfer in All-Polymer Donor–Acceptor Heterojunctions journal September 2022
Chemical Interface Damping in Nonstoichiometric Semiconductor Plasmonic Nanocrystals: An Effect of the Surrounding Environment journal May 2022
Efficient Hot Electron Transfer from Small Au Nanoparticles journal May 2020
Ultrafast and Long-Lived Transient Heating of Surface Adsorbates on Plasmonic Semiconductor Nanocrystals journal December 2020
Harvesting Sub-Bandgap IR Photons by Photothermionic Hot Electron Transfer in a Plasmonic p–n Junction journal April 2021
What’s so Hot about Electrons in Metal Nanoparticles? journal June 2017
Modulation of Cu 2– x S Nanocrystal Plasmon Resonance through Reversible Photoinduced Electron Transfer journal January 2016
Chemical Interface Damping Depends on Electrons Reaching the Surface journal February 2017
Highly Efficient Plasmon Induced Hot-Electron Transfer at Ag/TiO2 Interface journal April 2021
Enhanced Plasmonic Hot-Carrier Transfer in Au/WS2 Heterojunctions under Nonequilibrium Condition journal April 2022
Modulation of the Visible Absorption and Reflection Profiles of ITO Nanocrystal Thin Films by Plasmon Excitation journal March 2020
Reversible Tunability of the Near-Infrared Valence Band Plasmon Resonance in Cu 2– x Se Nanocrystals journal July 2011
Bandgap Engineering of Monodispersed Cu2–xSySe1–y Nanocrystals through Chalcogen Ratio and Crystal Structure journal October 2011
Ultrafast Charge Separation and Long-Lived Charge Separated State in Photocatalytic CdS–Pt Nanorod Heterostructures journal June 2012
Copper Sulfide Nanocrystals with Tunable Composition by Reduction of Covellite Nanocrystals with Cu + Ions journal November 2013
Back Electron–Hole Recombination in Hematite Photoanodes for Water Splitting journal January 2014
Mechanism of Photocatalytic Water Splitting in TiO 2 . Reaction of Water with Photoholes, Importance of Charge Carrier Dynamics, and Evidence for Four-Hole Chemistry journal October 2008
Plasmonic Cu 2− x S Nanocrystals: Optical and Structural Properties of Copper-Deficient Copper(I) Sulfides journal April 2009
Pt Particle Size Affects Both the Charge Separation and Water Reduction Efficiencies of CdS–Pt Nanorod Photocatalysts for Light Driven H2 Generation journal January 2022
Exciton–Phonon Interactions Govern Charge-Transfer-State Dynamics in CdSe/CdTe Two-Dimensional Colloidal Heterostructures journal October 2018
Plasmonic p–n Junction for Infrared Light to Chemical Energy Conversion journal December 2018
Spectroscopy and Dynamics of Nanometer-Sized Noble Metal Particles journal September 1998
Exciton Quenching Due to Copper Diffusion Limits the Photocatalytic Activity of CdS/Cu 2 S Nanorod Heterostructures journal January 2014
Plasmon-Induced Hot Electron Transfer from the Au Tip to CdS Rod in CdS-Au Nanoheterostructures journal October 2013
Efficient and Ultrafast Formation of Long-Lived Charge-Transfer Exciton State in Atomically Thin Cadmium Selenide/Cadmium Telluride Type-II Heteronanosheets journal January 2015
Localized surface plasmon resonances arising from free carriers in doped quantum dots journal April 2011
Polyvinylpyrrolidone-induced anisotropic growth of gold nanoprisms in plasmon-driven synthesis journal July 2016
Plasmon-induced hot carrier science and technology journal January 2015
Plasmon-induced hot-electron generation at nanoparticle/metal-oxide interfaces for photovoltaic and photocatalytic devices journal January 2014
Near infrared light induced plasmonic hot hole transfer at a nano-heterointerface journal June 2018
Infrared driven hot electron generation and transfer from non-noble metal plasmonic nanocrystals journal June 2020
Epitaxial growth of highly symmetrical branched noble metal-semiconductor heterostructures with efficient plasmon-induced hot-electron transfer journal May 2023
Plasmonic coupling at a metal/semiconductor interface journal November 2017
Harnessing infrared solar energy with plasmonic energy upconversion journal October 2022
Evaluation of the photoinduced electron relaxation dynamics of Cu1.8S quantum dots journal February 2003
Nanorod length-dependent photodriven H2 production in 1D CdS–Pt heterostructures journal September 2023
Highly efficient hot electron harvesting from graphene before electron-hole thermalization journal November 2019
The role of the plasmon in interfacial charge transfer journal July 2024
Efficient hot-electron transfer by a plasmon-induced interfacial charge-transfer transition journal August 2015
Plasmonic hot carrier dynamics in solid-state and chemical systems for energy conversion journal January 2016