| 초록 |
Lead-based halide perovskite solar cells receive attention since the first report on power conversion efficiency (PCE) of 3.8% in 2009. Up to now the highest certified PCE of 22% was reported. Despite the excellent high photovoltaic and photo efficiency that these materials have demonstrated, many researchers are attempting to replace lead with other materials because the lead based perovskites have drawbacks such as the toxicity and the instability of the material to atmospheric moisture. To address the toxicity issue, bismuth based perovskites have emerged as a candidate photovoltaic applications because they have not only non-toxic but also air stable properties. In this work, we report the synthesis of several compounds of bismuth perovskite materials such as Rb3Bi2I9, RbBi2I7, and RbBi3I10. And structural and optical measurements were also performed to examine the potential in the applications as an alternative to the lead containing perovskites. In addition, we demonstrate that structure-bandgap relationships in lead free bismuth perovskites. |
