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 10-100nm 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 1.44eV, which is near optimum value for low cost thin film solar cells.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physica Status Solidi (A) Applications and Materials Science|
|State||Published - Jul 2014|
- hydrothermal synthesis
- solar cells
- thin films