| 초록 |
All human beings are always polluting the earth. So, efforts to protect the earth must be made for our next generation. One of them is using the solar energy as a main energy source. In recent few years, perovskite solar cells have shown rapid developments and great possibility. But most of the superb perovskite solar cells have lead(Pb) which is environmentally toxic. For complete commercialization, lead will be replaced with other materials. A possible candidate is tin(Sn) which is non-toxic and has some similar properties with lead. However, because tin is unstable in the air, in terms of oxidization from Sn2+ to Sn4+, it is difficult to achieve high efficiency. We report some methods for improving air stability of tin-based perovskite solar cells. Surface passivation using SnF2 and SnCl2 and addition of excess halide sources to explore their correlation and duration in the air will be elucidated in this study. |
