Impact of point defects and secondary phases on performance of CZTSe solar cells.
Compositionally graded CZTSe films with around 200 solar cells investigated.
Structural characterization preformed by Raman spectroscopy and X-ray diffraction.
Tuning of VOC by adjusting the amount of the [VCu+ZnCu] defect clusters.
Secondary phase impact depends on their presence in bulk or surface of absorber.