Optical Properties and Electronic Structure of Copper Zinc Sulfide Nanocrystals

Mukherjee, A and Bhattacharyya, B and Rajasekar, GP and Narayan, A and Pandey, A (2021) Optical Properties and Electronic Structure of Copper Zinc Sulfide Nanocrystals. In: Journal of Physical Chemistry C .

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Abstract

Continued efforts to transition toward renewable energy sources have spurred tremendous research into the discovery of near-infrared gap semiconductors. Here we describe the optical properties and electronic structure of copper zinc sulfide nanocrystals, with copper mole fractions as high as xCu = 0.18. Copper zinc sulfide is shown to be a near-infrared gap semiconductor that exists in both zinc blende and wurtzite forms, similar to ZnS. The bandgap is shown to vary over 3.45-2.15 eV as the copper mole fraction is changed from 0.01 to 0.18. We find that the valence band of CuZnS nanocrystals has a significant tendency for hole localization, similar to other highly mismatched alloys. Further, our ultrafast studies are consistent with rapid (450 ± 60 fs) removal of conduction band electrons and subsequent defect emission over 4.3 ns. © 2021 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Copper compounds; Electronic structure; II-VI semiconductors; Infrared devices; Nanocrystalline alloys; Nanocrystals; Optical properties; Renewable energy resources; Sulfur compounds; Wide band gap semiconductors, Conduction band electrons; Defect emission; Hole localization; Mole fraction; Near Infrared; Renewable energy source; Ultra-fast; Zinc blende, Zinc sulfide
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	03 Dec 2021 07:03
Last Modified:	03 Dec 2021 07:03
URI:	http://eprints.iisc.ac.in/id/eprint/70113

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