One-step synthesis of high quality kesterite Cu2ZnSnS4nanocrystals: A hydrothermal approach

Tiong, Vincent Tiing, Bell, John, & Wang, Hongxia (2014) One-step synthesis of high quality kesterite Cu2ZnSnS4nanocrystals: A hydrothermal approach. Beilstein Journal of Nanotechnology, 5, pp. 438-446.

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Abstract

The present work demonstrates a systematic approach for the synthesis of pure kesterite-phase Cu2ZnSnS4 (CZTS) nanocrystals with a uniform size distribution by a one-step, thioglycolic acid (TGA)-assisted hydrothermal route. The formation mechanism and the role of TGA in the formation of CZTS compound were thoroughly studied. It has been found that TGA interacted with Cu2+ to form Cu+ at the initial reaction stage and controlled the crystal-growth of CZTS nanocrystals during the hydrothermal reaction. The consequence of the reduction of Cu2+ to Cu+ led to the formation Cu2−xS nuclei, which acted as the crystal framework for the formation of CZTS compound. CZTS was formed by the diffusion of Zn2+ and Sn4+ cations to the lattice of Cu2−xS during the hydrothermal reaction. The as-synthesized CZTS nanocrystals exhibited strong light absorption over the range of wavelength beyond 1000 nm. The band gap of the material was determined to be 1.51 eV, which is optimal for application in photoelectric energy conversion device.

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18 citations in Scopus
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15 citations in Web of Science®

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ID Code: 85916
Item Type: Journal Article
Refereed: Yes
Keywords: Cu2ZnSnS4 nanocrystals, formation mechanism, hydrothermal;, thioglycolic acid
DOI: 10.3762/bjnano.5.51
ISSN: 2190-4286
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Tiong et al; licensee Beilstein-Institut.
Deposited On: 23 Jul 2015 00:02
Last Modified: 23 Jul 2015 22:23

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