A facile and low-cost synthesis of promising absorber materials on Cu 2ZnSn(S x,Se 1-x) 4 nanocrystals consisting of earth abundant elements with tunable band gap characteristics

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

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Abstract

In this paper, we report a facile, low cost synthesis and characterization of kesterite Cu 2ZnSn(S x,Se 1-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 Cu 2ZnSnS 4 (CZTS), ZnS, Cu 2-xS, Sn 2S 3 and Cu 2SnS 3. 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 10 4 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.

Original languageEnglish (US)
Pages (from-to)21727-21732
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number40
DOIs
StatePublished - Oct 28 2012

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