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A simple chemical approach for the deposition of Cu 2 ZnSnS 4 thin films
Author(s) -
Kumar Arepalli Vinaya,
Park NamKyu,
Kim EuiTae
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330593
Subject(s) - czts , kesterite , thin film , chemical bath deposition , materials science , substrate (aquarium) , chemical engineering , solar cell , inorganic chemistry , nanotechnology , chemistry , optoelectronics , oceanography , geology , engineering
The direct synthesis of Cu 2 ZnSnS 4 (CZTS) on substrates by wet‐chemistry methods is of great interest for the fabrication photovoltaic thin‐film solar cells. We report a simple chemical bath deposition approach to form CZTS thin films on SLG glass substrates. CZTS films were directly deposited onto glass substrate at 60 °C using copper sulfate, zinc sulfate heptahydrate, tin sulfate dihydrate, and sodium thiosulfate as precipitating agents. Deposition of individual metal sulfide (Cu 2 S, ZnS, and SnS 2 ) showed homogeneous‐reaction dominant nanostructures rather than continuous thin film. By contrast, the combination of two or three metal precursors formed continuous thin films. As‐grown CZTS films deposited with both NH 3 and TEA showed a kesterite CZTS crystal structure. However, the absence of either NH 3 or TEA caused no crystallized CZTS film formation. The as‐grown CZTS films showed a kesterite crystal structure. Optical absorption study indicated that the as‐grown CZTS films had the optimum bang gap energy of 1.6 eV.