Issue 40, 2012

A facile and low-cost synthesis of promising absorber materials on Cu2ZnSn(Sx,Se1−x)4nanocrystals consisting of earth abundant elements with tunable band gap characteristics

Abstract

In this paper, we report a facile, low cost synthesis and characterization of kesterite Cu2ZnSn(Sx,Se1−x)4 (CZTSSe) nanocrystals (NCs) by a two-step process involving a solution-based precursor and a post-annealing route. The effects of different Se vaporization temperatures, ranging from 350 °C to 550 °C, on the structural, chemical, compositional, and optical properties of CZTSSe NCs were investigated. X-ray diffraction patterns, Raman spectroscopy, and transmission electron microscopy results indicated that the precursor powder showed several broad peaks that could not be assigned to Cu2ZnSnS4 (CZTS), ZnS, Cu2−xS, Sn2S3 and Cu2SnS3. However, the post-annealed NCs with and without Se vaporization were a single kesterite CZTS phase without a secondary phase. UV-vis spectroscopy results showed that the absorption coefficients of all the post-annealed NCs were over 104 cm−1 in the visible region, and the optical band gap energy decreased systematically from 1.46 eV to 1.14 eV with increasing Se vaporization temperatures.

Graphical abstract: A facile and low-cost synthesis of promising absorber materials on Cu2ZnSn(Sx,Se1−x)4 nanocrystals consisting of earth abundant elements with tunable band gap characteristics

Additions and corrections

Article information

Article type
Paper
Submitted
13 Jun 2012
Accepted
03 Aug 2012
First published
03 Aug 2012

J. Mater. Chem., 2012,22, 21727-21732

A facile and low-cost synthesis of promising absorber materials on Cu2ZnSn(Sx,Se1−x)4 nanocrystals consisting of earth abundant elements with tunable band gap characteristics

S. W. Shin, J. H. Han, Y. C. Park, G. L. Agawane, C. H. Jeong, J. H. Yun, A. V. Moholkar, J. Y. Lee and J. H. Kim, J. Mater. Chem., 2012, 22, 21727 DOI: 10.1039/C2JM33802E

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