A nontoxic and low-cost hydrothermal route for synthesis of hierarchical Cu2ZnSnS4 particles

Abstract

We explore a facile and nontoxic hydrothermal route for synthesis of a Cu2ZnSnS4 nanocrystalline material by using l-cysteine as the sulfur source and ethylenediaminetetraacetic acid (EDTA) as the complexing agent. The effects of the amount of EDTA, the mole ratio of the three metal ions, and the hydrothermal temperature and time on the phase composition of the obtained product have been systematically investigated. The addition of EDTA and an excessive dose of ZnCl2 in the hydrothermal reaction system favor the generation of kesterite Cu2ZnSnS4. Pure kesterite Cu2ZnSnS4 has been synthesized at 180°C for 12 h from the reaction system containing 2 mmol of EDTA at 2:2:1 of Cu/Zn/Sn. It is confirmed by Raman spectroscopy that those binary and ternary phases are absent in the kesterite Cu2ZnSnS4 product. The kesterite Cu2ZnSnS4 material synthesized by the hydrothermal process consists of flower-like particles with 250 to 400 nm in size. It is revealed that the flower-like particles are assembled from single-crystal Cu2ZnSnS4 nanoflakes with ca. 20 nm in size. The band gap of the Cu2ZnSnS4 nanocrystalline material is estimated to be 1.55 eV. The films fabricated from the hierarchical Cu2ZnSnS4 particles exhibit fast photocurrent responses under intermittent visible-light irradiation, implying that they show potentials for use in solar cells and photocatalysis.

Synthesis and Characterization of Chemical Spray Pyrolysed CZTS Thin Films for Solar Cell Applications

“…(b) shows the Raman spectra of the CZTS thin films prepared by varying S molar concentration. A single Raman intense peak located at 332 cm -1 is observed in all films and is close to the value reported for bulk CZTS [26,27].…”

Kesterite Inorganic-Organic Heterojunction for Solution Processable Solar Cells

“…A variety of synthetic routes including hot injection [29][30][31] solvothermal [32,33], phaseselective [34] and hydrothermal approaches [35,36] have been used previously to synthesize kesterite nanocrystals. We present a new method to synthesize nanopowders of kesterite Cu2ZnSnS4, which are The arrows show every second plane (the {110} plane), exhibits a slightly brighter contrast.…”

Synthesis and Characterization of Mixed Phase Cu2ZnSnS4 Nanomaterial by Low Cost Method

“…CZTS displays polymorphism with kesterite crystal structure. At the nanometer scale, CZTS also crystallizes in the kesterite phase, which resemble the tetragonal unitary cell . In the present work, we present the synthesis and characterization of colloidal CZTS nanocrystals.…”