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Kesterite CZTS nanocrystals: pH‐dependent synthesis
Author(s) -
Suryawanshi Mahesh,
Shin Seung Wook,
Bae Woo RI,
Gurav Kishor,
Kang Myun Gil,
Agawane Ganesh,
Patil Pramod,
Yun Jae Ho,
Lee Jeong Yong,
Moholkar Annasaheb,
Kim Jin Hyeok
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.201330384
Subject(s) - czts , kesterite , raman spectroscopy , nanocrystal , hydrothermal circulation , materials science , phase (matter) , band gap , crystallography , chemistry , chemical engineering , nanotechnology , optoelectronics , optics , physics , engineering , organic chemistry
The kesterite Cu 2 ZnSnS 4 (CZTS) nanocrystals (NCs) were successfully synthesized using a relatively simple and one‐step hydrothermal route. The structural, compositional, and optical properties of the kesterite CZTS NCs have been studied in detail. The pH‐dependent CZTS phase formation has been elucidated for the first time. The X‐ray diffraction and Raman spectroscopy confirmed the formation of a main phase kesterite CZTS structure only at pH 7. However, for pH values (4.3, 5, and 9), the formation of CZTS alongwith few secondary phases like Cu 2 SnS 3 (CTS), Cu 2− x S, and SnS 2 /Sn 2 S 3 have been detected. CZTS NCs of size 10–100 nm were obtained at 200 °C and pH 7. The synthesized NCs showed a pH‐dependent variation in optical band gap values from 1.15 to 1.44 eV, which is near optimum value for low cost thin film solar cells.