论文标题
混合卤化物钙钛矿中的轻柔性三相共存
Light-tunable three-phase coexistence in mixed halide perovskites
论文作者
论文摘要
在太阳能电池中使用的混合碘 - 溴化钙钛矿经历临界温度低于临界温度，固有的将固有的分解成具有不同碘溴组成的相。另外，在照明下它们显示了富含碘相的成核。我们从热力学的考虑中预测，在混合的碘溴钙蛋白酶中，如mapb（i $ _ {1-x} $ br $ _x $）$ _ 3 $这些效果的相互作用可能会导致富含溴，碘富含碘的富含剂量，几乎碘化碘 - 碘 - 碘 - 碘 - 碘 - 碘 - 碘 - 碘 - 碘含量。这种三相共存发生在组成 - 温度相图的一个区域中，以固有固定的临界点附近。当温度或照明强度循环时，我们研究了这种共存的演变中的滞后。根据建立共存的特定方式，几乎仅在富含碘的相位或富含溴和碘的相的碘相应该形成碘 - 核。通过吸收和光致发光实验的结合，应该可以对这种根本新型的可轻松三相共存的实验验证。
Mixed iodine-bromine perovskites used in solar cells undergo below a critical temperature an intrinsic demixing into phases with different iodine-bromine compositions. In addition, under illumination they show nucleation of an iodine-rich phase. We predict from thermodynamic considerations that in mixed iodine-bromine perovskites like MAPb(I$_{1-x}$Br$_x$)$_3$ the interplay of these effects can lead to coexistence of a bromine-rich, iodine-rich, and nearly iodine-pure nucleated phase. This three-phase coexistence occurs in a region in the composition-temperature phase diagram near the critical point for intrinsic demixing. We investigate the hysteresis in the evolution of this coexistence when temperature or illumination intensity are cycled. Depending on the particular way the coexistence is established, nearly iodine-pure nuclei should form either in the iodine-rich phase only or both in the bromine-rich and iodine-rich phases. Experimental verification of this fundamentally novel type of light-tunable three-phase coexistence should be possible by a combination of absorption and photoluminescence experiments.
