High-bandgap (>1.7 eV) mixed halide perovskites for multijunction solar cells are usually affected by photoinduced phase segregation, which triggers sub-bandgap defects that are detrimental to the open-circuit voltage. While this effect may be reversed, e.g., when leaving the cells in the dark, new perovskite compositions that exhibit enhanced stability may be required. In this Perspective, the compositional space beyond the conventional methylammonium- and formamidinium-based mixed halide compounds is reviewed in light of multijunction applications. These alternative absorber compositions include: (1) layered or quasi-2D perovskites, where larger organic cations are incorporated into the structure; (2) inorganic perovskites (i.e., when the organic components are removed altogether); and (3) lead-free structures, where the toxic lead is substituted by one or more elements. The development perspectives of high-efficiency and stable perovskite materials based on these compositions are discussed in view of an integration in multijunction solar cells.

用于多结太阳能电池的高带隙（> 1.7 eV）混合卤化物钙钛矿通常受光致相分离的影响，这会引发不利于开路电压的亚带隙缺陷。虽然这种作用可以逆转，例如，当将细胞置于黑暗中时，可能需要表现出增强的稳定性的新钙钛矿组合物。在这个观点中，鉴于多结应用，回顾了常规的甲基铵和甲ami基混合卤化物以外的组成空间。这些替代的吸收剂组合物包括：（1）层状或准2D钙钛矿，其中较大的有机阳离子掺入结构中；（2）无机钙钛矿（即完全去除有机成分时）；（3）无铅结构，其中有毒铅被一种或多种元素取代。鉴于多结太阳能电池中的集成，讨论了基于这些组成的高效，稳定的钙钛矿材料的发展前景。