| Preparation of Cu2ZnSnS4 nano-crystalline powder by mechano-chemical method |
| Paper ID : 1255-UFGNSM-FULL |
| Authors: |
|
Farzaneh Alirezazadeh1, Saeed Sheibani *2, Fereshteh Rashchi3 1North Kargar st., College of Engineering 2Assistant Professor, Metallurgy and Materials Engineering 3University of Tehran |
| Abstract: |
| Copper zinc tin sulfide (Cu2ZnSnS4, CZTS) is one of the most promising ceramic materials as an absorber layer in solar cells due to its suitable band gap, high absorption coefficient and non-toxic and environmental friendly constituent elements. In this work, nano-crystalline CZTS powder was synthesized by mechanical milling. Elemental powders of Cu, Zn, Sn and were mixed in atomic ratio of 2:1:1:4 according to the stoichiometry of Cu2ZnSnS4 and then milled in a planetary high energy ball mill under argon atmosphere. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffusion reflectance spectroscopy (DRS). XRD results confirm the formation of single-phase CZTS with kesterite structure after 20 h of milling. Also, the mean crystallite size was about 11 nm. SEM results show that after 20 h of milling, the product has a relatively uniform particle size distribution. Optical properties of the product indicate that the band gap of prepared CZTS is 1.6 eV which is near to the optimum value for photovoltaic solar cells showing as a light absorber material in solar energy applications. |
| Keywords: |
| Cu2ZnSnS4, Nano-crystalline, Mechanical milling, Optical properties. |
| Status : Paper Accepted (Poster Presentation) |
