Inorganic perovskites such as CsPbI₂Br have attracted much attention owing to their intrinsic merits of thermal stability. However, the phase instability of CsPbI₂Br in real‐world operating conditions remains a major impediment to its prospective applications. Herein we report a method on enhancing the phase stabilization of inorganic perovskite CsPbI₂Br and device performance in corresponding device engaged by Mg²⁺ ion substitution. Owing to small ionic radius and superior electron donating ability of Mg²⁺, a well-match in crystalline lattices between Cs⁺ and cubooctahedral void of Mg-substituted perovskite compounds and the reduced interaction between water molecules and perovskite all can offer stable perovskite phase of CsPb_xMg_1−xI₂Br in ambient atmosphere. Moreover, we observed the enlarged charge diffusion lengths and more faster charge transportation rate for Mg-substituted perovskite-based device. Consequently, the resultant perovskite solar cell using CsPb_xMg_1−xI₂Br with a full printable framework of FTO/c‐TiO₂/m‐TiO₂/Al₂O₃/NiO/carbon achieves a power conversion efficiency of 10.8%. We further noticed that a common phenomenon of energy loss in mesoporous perovskite solar cells can be significantly reduced in the case of CsPb_0.98Mg_0.02I₂Br.

无机钙钛矿，例如CsPbI ₂ Br，由于其固有的热稳定性优点而备受关注。但是，CsPbI ₂ Br在实际操作条件下的相不稳定性仍然是其潜在应用的主要障碍。在本文中，我们报告了一种增强无机钙钛矿CsPbI ₂ Br的相稳定性和在Mg ²⁺离子取代参与的相应器件中器件性能的方法。由于Mg ^2+的离子半径小和给电子能力强，Cs ⁺之间的晶格匹配良好Mg取代的钙钛矿化合物的立方八面体空隙以及水分子与钙钛矿之间的相互作用降低，都可以在环境大气中提供稳定的CsPb _x Mg _{1 - x} I ₂ Br钙钛矿相。此外，我们观察到了基于Mg取代的钙钛矿的器件的电荷扩散长度增加，电荷传输速率更快。因此，得到的钙钛矿型太阳能电池使用CsPb _x Mg _{1 - x} I ₂ Br和完整的可打印框架FTO / c-TiO ₂ / m-TiO ₂ / Al ₂ O ₃/ NiO / carbon可实现10.8％的功率转换效率。我们还注意到，在CsPb _0.98 Mg _0.02 I ₂ Br的情况下，介孔钙钛矿太阳能电池中常见的能量损失现象可以大大减少。