A facile and low cost synthesis of earth abundant element Cu 2ZnSnS 4 (CZTS) nanocrystals: Effect of Cu concentrations

Seung Wook Shin, Jun Hee Han, Chan Yeong Park, Sae Rok Kim, Yeon Chan Park, G. L. Agawane, A. V. Moholkar, Jae Ho Yun, Chae Hwan Jeong, Jeong Yong Lee, Jin Hyeok Kim

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Cu 2ZnSnS 4 (CZTS) nanocrystals (NCs) were synthesized by sulfurization of microwave assisted precursor powders without toxic chemicals. The effects of different Cu concentration from 0.01 to 0.025 M on the structural, morphological, compositional, chemical and optical properties of CZTS NCs were investigated. X-ray diffraction patterns, X-ray photoelectron spectroscopy and transmission electron microscopy results showed that the precursor powder contains several broad peaks that could not be assigned to CZTS, ZnS, Cu 2-xS, Sn 2S 3 and Cu 2SnS 3. However, the sulfurized NCs showed both kesterite CZTS and Cu- and Sn-based secondary phases except for that formed at Cu concentration of 0.02 M. Inductively coupled plasma (ICP) results showed that the presence of Cu in the sulfurized CZTS NCs increased with increasing Cu concentration from 16.57 to 32.94 at.% while Zn and Sn in the sulfurized CZTS NCs decreased with increasing Cu concentration. UV-Vis spectroscopy results showed that the absorption coefficient of the sulfurized NCs was over 10 4 cm -1 in the visible region and band gap energy of the sulfurized CZTS NCs decreased from 1.65 to 1.28 eV with increasing Cu concentration.

Original languageEnglish (US)
Pages (from-to)192-197
Number of pages6
JournalJournal of Alloys and Compounds
Volume541
DOIs
StatePublished - Nov 15 2012

Keywords

  • Cu ZnSnS (CZTS) absorber material
  • Cu concentration
  • Facile and low cost microwave assisted process
  • Nanocrystal (NCs)

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