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Controllable Synthesis of Wurtzite Cu 2 ZnSnS 4 Nanocrystals by Hot‐Injection Approach and Growth Mechanism Studies
Author(s) -
Luo Qun,
Zeng Yongquan,
Chen Liwei,
Ma Changqi
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402152
Subject(s) - czts , oleylamine , wurtzite crystal structure , monoclinic crystal system , nanocrystal , materials science , kesterite , chemical engineering , crystallography , phase (matter) , nanotechnology , crystal structure , chemistry , zinc , metallurgy , thin film , organic chemistry , engineering
Wurtzite Cu 2 ZnSnS 4 (WZ‐CZTS) has been controllably synthesized through a hot‐injection route. The crystal‐growth mechanism of WZ‐CZTS has been investigated by using time‐dependent XRD patterns, TEM images, and absorption spectra analysis, and revealed that WZ‐CZTS nucleated and grew from monoclinic Cu 7 S 4 nanocrystals through phase transformation of Cu 7 S 4 to WZ‐CZTS within 5 min. The synthesis processes are dependent on precursor concentration, reaction temperature, reaction time, organic ligand, and sulfur source and have been studied in detail. It was revealed that the width of the WZ‐CZTS nanocrystals was mainly controlled by the precursor concentration, which determines the diameter of Cu 7 S 4 . The length could be regulated by the ratio of dodecanethiol (DDT) to oleylamine (OLA) and reaction time.