Enhanced Stability and Performance in Perovskite Nanocrystal Light‐Emitting Devices Using a ZnMgO Interfacial Layer,Advanced Optical Materials

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Enhanced Stability and Performance in Perovskite Nanocrystal Light‐Emitting Devices Using a ZnMgO Interfacial Layer
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2017-08-21 , DOI: 10.1002/adom.201700377
Hua Wu ₁ , Yu Zhang ₁ , Xiaoyu Zhang ₁ , Min Lu ₁ , Chun Sun ₁ , Tieqiang Zhang ₂ , William W. Yu _{1,

3}

Affiliation

Perovskite has been considered to be a promising optoelectronic material due to its superior properties, yet, it are strongly sensitive to oxygen and water, especially when applied in devices. Here, a highly efficient and stable light‐emitting device (LED) is reported by applying solution‐processed Mg‐doped ZnO (MZO) nanocrystals (NCs) as an interfacial layer. The effect of Mg doping on the optical and electronic properties of NCs is investigated. This study demonstrates that the air stability of perovskite NC film is significantly enhanced because of the decreased oxygen vacancy surface sites of MZO NCs. Incorporation of a MZO layer with favorable electronic energy level to form a suitable band alignment promotes electron injection and enhances the LED performance. Compared to the device without MZO, the LED shows 3059 cd m⁻² of luminance, with 1.9 times enhanced current efficiency and 2 times increased external quantum efficiency. In addition, the device with MZO also exhibits better stability. This research provides a potential strategy for realizing stable and efficient perovskite LEDs.

中文翻译：

使用ZnMgO界面层的钙钛矿纳米晶体发光器件的增强的稳定性和性能

钙钛矿由于其优越的性能而被认为是有前途的光电材料，然而，它对氧气和水非常敏感，尤其是在设备中使用时。在这里，通过应用溶液处理的掺Mg的ZnO（MZO）纳米晶体（NCs）作为界面层，报道了一种高效且稳定的发光器件（LED）。研究了Mg掺杂对NCs光学和电子性能的影响。这项研究表明，由于MZO NCs的氧空位表面位置减少，钙钛矿NC膜的空气稳定性得到了显着增强。结合具有良好电子能级的MZO层以形成合适的能带排列可促进电子注入并增强LED性能。与没有MZO的设备相比，LED显示3059 cd m亮度为⁻²，电流效率提高1.9倍，外部量子效率提高2倍。此外，带有MZO的设备还具有更好的稳定性。这项研究为实现稳定，高效的钙钛矿LED提供了一种潜在的策略。

更新日期：2017-08-21

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