Lead halide perovskite nanocrystals are currently under intense investigation as components of solution-processed light-emitting devices (LEDs). We demonstrate LEDs based on Ag doped–passivated CsPbI₃ perovskite nanocrystals with external quantum efficiency of 11.2% and an improved stability. Ag and trilayer MoO₃/Au/MoO₃ structure were used as cathode and anode, respectively, which reduce the electron injection barrier and ensure the high transparency and low resistance of the anode. Silver ions diffuse into perovskite film from the Ag electrode, as confirmed by the elemental mapping, the presence of Ag 3d peaks in the X-ray photoelectron spectrum, and the peak shift in the X-ray diffraction patterns of CsPbI₃. In addition to doping, silver ions play the beneficial role of passivating surface defect states of CsPbI₃ nanocrystals, which results in increased photoluminescence quantum yield, elongated emission lifetime, and improved stability of perovskite films.

中文翻译：

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CsPbI3 钙钛矿活性层的自发银掺杂和表面钝化使发光器件的外部量子效率达到 11.2%

目前，卤化铅钙钛矿纳米晶体作为溶液加工发光器件（LED）的组件正在接受深入研究。我们展示了基于 Ag 掺杂钝化 CsPbI ₃钙钛矿纳米晶体的 LED，其外量子效率为 11.2%，稳定性更高。分别采用Ag和三层MoO ₃ /Au/MoO _{3结构作为阴极和阳极，降低了电子注入势垒，保证了阳极的高透明性和低电阻。}银离子从 Ag 电极扩散到钙钛矿薄膜中，这一点通过元素图谱、X 射线光电子能谱中 Ag 3d 峰的存在以及 CsPbI 3 X 射线衍射图中的峰位移得到_证实。除了掺杂之外，银离子还可以钝化CsPbI ₃纳米晶体的表面缺陷态，从而提高钙钛矿薄膜的光致发光量子产率、延长发射寿命和提高稳定性。