Novel Au/Cu2NiSnS4 Nano-Heterostructure: Synthesis, Structure, Heterojunction Band Offset and Alignment, and Interfacial Charge Transfer Dynamics

Jadhav, YA and Rahane, GK and Goswami, T and Jagadish, K and Chordiya, K and Roy, A and Debnath, T and Jathar, SB and Devan, R and Upadhyay Kahaly, M and Rondiya, SR and Ghosh, HN and Dzade, NY (2023) Novel Au/Cu2NiSnS4 Nano-Heterostructure: Synthesis, Structure, Heterojunction Band Offset and Alignment, and Interfacial Charge Transfer Dynamics. In: ACS Applied Materials and Interfaces, 16 . 21746 - 21756.

PDF Acs_app_mat_int_2023.pdf - Published Version Restricted to Registered users only Download (7MB) | Request a copy

Abstract

Considering the importance of physics and chemistry at material interfaces, we have explored the coupling of multinary chalcogenide semiconductor Cu2NiSnS4 nanoparticles (CNTS NPs) for the first time with the noble metal (Au) to form Au-CNTS nano-heterostructures (NHSs). The Au-CNTS NHSs is synthesized by a simple facile hot injection method. Synergistic experimental and theoretical approaches are employed to characterize the structural, optical, and electrical properties of the Au-CNTS NHSs. The absorption spectra demonstrate enhanced and broadened optical absorption in the ultraviolet-visible-near-infrared (UV-Vis-NIR) region, which is corroborated by cyclic voltammetry (CV) readings. CV measurements show type II staggered band alignment, with a conduction band offset (CBO) of 0.21 and 0.23 eV at the Au-CNTS/CdS and CNTS/CdS interface, respectively. Complementary first-principles density functional theory (DFT) calculations predict the formation of a stable Au-CNTS NHSs, with the Au nanoparticle transferring its electrons to the CNTS. Moreover, our interface analysis using ultrafast transient absorption experiments demonstrate that the Au-CNTS NHSs facilitates efficient transport and separation of photoexcited charge carriers when compared to pristine CNTS. The transient measurements further reveal a plasmonic electronic transfer from the Au nanoparticle to CNTS. Our advanced analysis and findings will prompt investigations into new functional materials and their photo/electrocatalysis and optoelectronic device applications in the future. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Materials and Interfaces
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Charge transfer; Copper compounds; Cyclic voltammetry; Density functional theory; Functional materials; Gold nanoparticles; Heterojunctions; Infrared devices; Light absorption; Metal nanoparticles; Nickel compounds; Optoelectronic devices, Au nanoparticle; Au/CNTS hetero-nanostructure; Band alignments; Band-offset; Charge carrier dynamics; Charge-transfer dynamics; Hetero-nanostructures; Interfacial charge transfer; Nano-heterostructures; Transient absorption spectroscopies, Transient absorption spectroscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Sep 2024 07:14
Last Modified:	02 Sep 2024 07:14
URI:	http://eprints.iisc.ac.in/id/eprint/84944

Actions (login required)

View Item