| 초록 |
In the current study, CZTSSe thin film solar cell were fabricated using vacuum-based DC-sputtering. The metallic Cu, Sn and Zn stacked precursors were deposited sequentially by sputtering method on the Molybdenum coted soda lime glass as Mo/Zn/Sn/Cu respectively. To evaluate the effect of Sn excess, the deposition time of Sn precursor were varied and the effect of Sn content on compositional ratio along with photon conversion efficiency were examined. The phase purity and corresponding crystal structure of sulfo-selenized absorbers at 520 °C were examined using X-ray diffraction(XRD) and the cross-sectional morphologies of prepared thin films were observed using a Scanning electron microscope(SEM). To conclude, the elemental compositional ratio was measured by X-ray fluorescence spectroscopy (XRF). Based on the observations, it was concluded that the increasing Sn content suppressed the voids formation, and formation secondary phases significantly reduced the device efficiency. The device with optimal deposition time and compositional ratio exhibits 11.03 photon conversion efficiency with Voc of 0.49 mV, Jsc- 34.83, FF-64 %. |
