Abstract
An effective synthesis strategy is employed to fabricate Cu2ZnSnS4 (CZTS) thin films using radio frequency (rf) magnetron sputtering technique on soda lime glass substrates. The as-grown films are annealed at different temperatures ranging between 350 and 550°C, and their chemical compositions and structural properties are investigated. The as-grown films have poor Cu/(Zn+Sn) ratios ranging between 0.39 and 0.44 and S/(Cu+Zn+Sn) ratios ranging between 0.97 and 1.21. The Cu/(Zn+Sn) ratio is improved by growing a thin additional Cu-capping layer on the as-grown film followed by annealing. An improved Cu/(Zn+Sn) ratio of ~0.71 is obtained and the S/(Cu+Zn+Sn) ratio is slightly reduced to ~0.85. The formation of a kesterite type CZTS is confirmed using X-ray diffraction and Raman spectroscopy measurements. Absorption measurements and band-gap energy determination of the CZTS films are carried out in order to confirm applicability to solar cells.
Original language | English |
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Pages (from-to) | 196-203 |
Number of pages | 8 |
Journal | Solar Energy |
Volume | 91 |
DOIs | |
State | Published - May 2013 |
Keywords
- CuZnSnS (CZTS) thin films
- Magnetron sputtering
- Raman spectroscopy
- Solar cell
- Thermal annealing