Unraveling Deposition Atmosphere Impact on Reproducibility of Perovskite Light-Emitting Diodes,The Journal of Physical Chemistry Letters

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Unraveling Deposition Atmosphere Impact on Reproducibility of Perovskite Light-Emitting Diodes
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-05-25 , DOI: 10.1021/acs.jpclett.3c01067
Yatao Zou ₁ , Ya Li ₁ , Xinghan Pang ₂ , Yuhang Song ₂ , Weidong Xu ₃ , Baoquan Sun _{1,

2}

Affiliation

Manipulating the crystallization dynamics of perovskite emitters is an effective strategy for preparing high-performance perovskite light-emitting diodes (PeLEDs). In general, amorphous-like thermodynamically stable intermediates are desirable for a retarded and controllable crystallization process of perovskite emitters. Despite a variety of well-demonstrated strategies for crystallization control, it has been generally realized that perovskite thin-film emitters show problematic reproducibility. Here, we unraveled that the coordinating solvent vapor residues could raise deleterious influences on the formation of amorphous intermediate phases, which thus leads to varying crystal qualities from batch to batch. We demonstrated that undesirable crystalline intermediate phases tend to form with a strong coordination solvent vapor atmosphere, which alters the crystallization process and thus brings about additional ionic defects. By applying an inert gas flush strategy, this detrimental effect could be effectively mitigated, enabling PeLEDs with high reproducibility. This work provides new insight into the fabrication of efficient and reproducible perovskite optoelectronics.

中文翻译：

揭示沉积气氛对钙钛矿发光二极管再现性的影响

操纵钙钛矿发射体的结晶动力学是制备高性能钙钛矿发光二极管 (PeLED) 的有效策略。通常，类非晶热力学稳定的中间体对于钙钛矿发射体的延迟和可控结晶过程是理想的。尽管有多种充分证明的结晶控制策略，但人们普遍认识到钙钛矿薄膜发射体显示出重现性问题。在这里，我们阐明了配位溶剂蒸气残留物可能对无定形中间相的形成产生有害影响，从而导致不同批次的晶体质量不同。我们证明了不良的结晶中间相往往会在强配位溶剂蒸气气氛中形成，这会改变结晶过程，从而带来额外的离子缺陷。通过应用惰性气体冲洗策略，可以有效减轻这种不利影响，从而使 PeLED 具有高再现性。这项工作为高效和可重复的钙钛矿光电器件的制造提供了新的见解。

更新日期：2023-05-25

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