Effects of local compositional heterogeneity in mixed halide perovskites on blue electroluminescence-猫眼课题宝

DOI：

10.1016/j.matt.2023.12.019

发表时间：

2024-01

期刊：

Matter

影响因子：

18.9

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Xiyu Luo;Weidong Xu;Guanhaojie Zheng;Sandhya Tammireddy;Qi Wei;Max Karlsson;Zhaojun Zhang;Kangyu Ji;Simon Kahmann;Chunyang Yin;Yatao Zou;Zeyu Zhang;Huaiyu Chen;Lucas A.B. Marçal;Haifeng Zhao;Dongxin Ma;Dongdong Zhang;Yue Lu;Mingjie Li;Carsten Deibel;S. Stranks;Lian Duan;J. Wallentin;Wei Huang;Feng Gao

在混合溴化物/碘化物钙钛矿光吸收剂中通常观察到组成异质性，通常对电荷载流子复合和光伏性能的影响最小。然而，到目前为止，它在溴化物/氯化物混合的钙钛矿中受到的关注非常有限，这对蓝光发光二极管具有特别重要的意义。在这里，我们发现，即使是轻微程度的局部卤化物异质性导致严重的非辐射损失在混合溴化物/氯化物蓝色钙钛矿发射器，呈现出鲜明的对比，在photopolics的一般观察。我们不仅提供了从微米到亚微米尺度的异质性景观的可视化，而且还确定了这个问题主要来自钙钛矿成核过程中最初形成的富含氯化物的簇。我们的工作揭示了一个长期被忽视的因素，阻碍了使用混合卤化物钙钛矿的蓝色发光二极管的发展，并提供了一个实用的策略来缓解这个问题。

Compositional heterogeneity is commonly observed in mixed bromide/iodide perovskite photoabsorbers, typically with minimal effects on charge carrier recombination and photovoltaic performance. Consistently, it has so far received very limited attention in bromide/chloride-mixed perovskites, which hold particular significance for blue light-emitting diodes. Here, we uncover that even a minor degree of localized halide heterogeneity leads to severe non-radiative losses in mixed bromide/chloride blue perovskite emitters, presenting a stark contrast to general observations in photovoltaics. We not only provide a visualization of the heterogeneity landscape spanning from micro-to sub-microscale but also identify that this issue mainly arises from the initially formed chloride-rich clusters during perovskite nucleation. Our work sheds light on a long-term neglected factor impeding the advancement of blue light-emitting diodes using mixed halide perovskites and provides a practical strategy to mitigate this issue.

Effects of local compositional heterogeneity in mixed halide perovskites on blue electroluminescence

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