| 초록 |
Sn-based halide perovskite compounds are a promising eco-friendly materials for optoelectronic device. However, their sensitivity to air critically restricts their device applications. Herein, we demonstrate a new strategy to improve the stability of Sn-based perovskite materials by chemical doping. We reveal that specific dopants suppress the undesirable phase formation of Sn-based perovskite materials by changing formation energy and oxidation of Sn2+ in doped samples occurs at a significantly lower rate in air. We analyze structural changes of the undoped and doped Sn-based perovskite compounds under various condition, and moisture mainly causes the phase transition of them. In optical properties, these dopants also induce unusual optical band gap shifts in Sn-based perovskite materials, and these band gap tuning effects are contributed by p orbitals of dopants. These finding helps finely tune properties of Sn-based perovskite materials for various applications. |
