Effects of the metallic target compositions on the absorber properties and the performance of Cu2ZnSnSe4 solar cell devices fabricated on TiN-coated Mo/glass substrates

- Cu2ZnSnSe4 films were prepared by metallic-target sputtering and post-selenization.
- Target composition determines film characteristics and device performance.
- CZTSe of the 2.6% efficient cell had np of 7.06 × 1017 cm−3 and μ of 80 cm2 V−1 s−1.
- Dense CZTSe films with large CZTSe grains of 2.5-5.0 μm were obtained.
- Our devices had the microstructure similar to those of top devices in efficiency.