Rationalizing the light-induced phase separation of mixed halide organic-inorganic perovskites.
Rationalizing the light-induced phase separation of mixed halide organic-inorganic perovskites.
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DOI：
10.1038/s41467-017-00284-2
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发表时间：
2017-08-04
影响因子：
16.6
通讯作者：
Kuno M
中科院分区：
文献类型：
--
作者：
Draguta S;Sharia O;Yoon SJ;Brennan MC;Morozov YV;Manser JS;Kamat PV;Schneider WF;Kuno M
混合卤化物混合钙钛矿CH 3 NH3 Pb（I1-xBrx）3是低成本、高效率光伏和发光器件的良好候选材料。它们的带隙可以从1.6调整到2.3 eV，通过改变卤素阴离子的身份。不幸的是，混合卤化物钙钛矿在光照下经历相分离。这导致碘化物和溴化物丰富的领域沿着与相应的变化，以材料的光学/电学响应。在这里，使用相结合的光谱测量和理论建模，我们定量合理化的所有微观过程中发生的相分离。我们的模型表明，相分离背后的驱动力是带隙减少的碘化物丰富的阶段。它还解释了所观察到的非线性强度依赖性，以及富碘域的自限性生长。最重要的是，我们的模型表明，混合卤化物钙钛矿可以通过故意设计载流子扩散长度和注入载流子密度来稳定相分离。混合卤化物混合钙钛矿具有可调的带隙，然而，在光照下，它们经历相分离。利用光谱测量和理论建模，Draguta和Sharia等人定量地合理化了相分离过程中发生的微观过程。
Mixed halide hybrid perovskites, CH3NH3Pb(I1−xBrx)3, represent good candidates for low-cost, high efficiency photovoltaic, and light-emitting devices. Their band gaps can be tuned from 1.6 to 2.3 eV, by changing the halide anion identity. Unfortunately, mixed halide perovskites undergo phase separation under illumination. This leads to iodide- and bromide-rich domains along with corresponding changes to the material’s optical/electrical response. Here, using combined spectroscopic measurements and theoretical modeling, we quantitatively rationalize all microscopic processes that occur during phase separation. Our model suggests that the driving force behind phase separation is the bandgap reduction of iodide-rich phases. It additionally explains observed non-linear intensity dependencies, as well as self-limited growth of iodide-rich domains. Most importantly, our model reveals that mixed halide perovskites can be stabilized against phase separation by deliberately engineering carrier diffusion lengths and injected carrier densities. Mixed halide hybrid perovskites possess tunable band gaps, however, under illumination they undergo phase separation. Using spectroscopic measurements and theoretical modelling, Draguta and Sharia et al. quantitatively rationalize the microscopic processes that occur during phase separation.
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