학술논문
Effects of local compositional heterogeneity in mixed halide perovskites on blue electroluminescence
Document Type
Author
Luo, Xiyu; Xu, Weidong; Zheng, Guanhaojie; Tammireddy, Sandhya; Wei, Qi; Karlsson, Max; Zhang, Zhaojun; Ji, Kangyu; Kahmann, Simon; Yin, Chunyang; Zou, Yatao; Zhang, Zeyu; Chen, Huaiyu; Marçal, Lucas A.B.; Zhao, Haifeng; Ma, Dongxin; Zhang, Dongdong; Lu, Yue; Li, Mingjie; Deibel, Carsten; Stranks, Samuel D.; Duan, Lian; Wallentin, Jesper; Huang, Wei; Gao, Feng
Source
Matter NanoLund: Centre for Nanoscience eSSENCE: The e-Science Collaboration. 7(3):1054-1070
Subject
Language
English
ISSN
2590-2393
Abstract
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.