Iodide and bromide integration facilitate bandgap tunability in wide-bandgap perovskites, yet high concentrations of bromide lead to halide phase segregation, adversely affecting the efficiency and stability of solar cell devices. In this work, 2-amino-4,5-imidazoledicarbonitrile (AIDCN), with highly polarized charge distribution and compact molecular configuration, is incorporated into a 1.86 eV wide-bandgap perovskite to effectively suppress photoinduced iodine escape and phase segregation. Hyperspectral photoluminescence microscopy reveals that AIDCN mitigates phase segregation under continuous laser exposure. Concurrent in situ grazing-incidence wide-angle X-ray scattering and X-ray fluorescence measurements further validate suppressed iodine escape, evidenced by a notable slowing down of lattice shrinkage and a well-maintained overall chemical composition of the perovskite under continuous illumination. Applying this approach, we achieve a power conversion efficiency (PCE) of 18.52% in 1.86 eV wide-bandgap perovskite solar cells. By integrating this perovskite subcell with the PM6:BTP-eC9 organic subcell, the tandem attains a maximum PCE of 25.13%, with a certified stabilized PCE of 23.40%.

中文翻译：

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稳定钙钛矿有机串联太阳能电池中的高效宽带隙钙钛矿


碘化物和溴化物的结合促进了宽带隙钙钛矿的带隙可调性，但高浓度的溴化物会导致卤化物相偏析，对太阳能电池器件的效率和稳定性产生不利影响。在这项工作中，将具有高度极化电荷分布和紧凑分子构型的2-氨基-4,5-咪唑二甲腈（AIDCN）纳入1.86 eV宽带隙钙钛矿中，可有效抑制光致碘逃逸和相分离。高光谱光致发光显微镜表明，AIDCN 在连续激光照射下减轻了相分离。同时进行的原位掠入射广角 X 射线散射和 X 射线荧光测量进一步验证了碘逃逸受到抑制，这可以通过连续照明下钙钛矿晶格收缩的显着减缓和钙钛矿的整体化学成分保持良好来证明。应用这种方法，我们在 1.86 eV 宽带隙钙钛矿太阳能电池中实现了 18.52% 的功率转换效率 (PCE)。通过将该钙钛矿子电池与 PM6:BTP-eC9 有机子电池集成，该串联电池的最大 PCE 为 25.13%，经过认证的稳定 PCE 为 23.40%。