2D transition metal carbides, nitrides, and carbonitrides called MXenes show outstanding performance in many applications due to their superior physical and chemical properties. Herein, a ZnO–MXene mixture with different contents of Ti₃C₂ is applied as electron transport layers (ETLs) and the influence of the Ti₃C₂ MXene in all‐inorganic metal halide perovskite nanocrystal light‐emitting diodes (perovskite NC LEDs) is explored. The addition of Ti₃C₂ makes more balanced charge carrier transport in LEDs by changing the energy level structure and electron mobility of ETL. Moreover, lower surface roughness is obtained for the ETL, thus guaranteeing uniform distribution of the perovskite NCs layer and further reducing leakage current. As a result, a 17.4% external quantum efficiency (EQE) with low efficiency roll‐off is achieved with 10% Ti₃C₂, which is a 22.5% improvement compared to LEDs without Ti₃C₂.

中文翻译：

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用于高外部量子效率钙钛矿纳米晶体发光二极管的 ZnO-Ti3C2 MXene 电子传输层

被称为 MXene 的二维过渡金属碳化物、氮化物和碳氮化物由于其卓越的物理和化学性质，在许多应用中表现出出色的性能。在此，采用具有不同Ti ₃ C _{2含量的ZnO-MXene混合物作为电子传输层（ETL），并研究了Ti 3} C ₂ MXene对全无机金属卤化物钙钛矿纳米晶体发光二极管（钙钛矿NC LED）的影响）进行了探索。_{Ti 3} C ₂的添加通过改变ETL的能级结构和电子迁移率，使得LED中的载流子传输更加平衡。此外，ETL获得了较低的表面粗糙度，从而保证了钙钛矿NCs层的均匀分布，进一步减少了漏电流。结果，使用 10% Ti ₃ C ₂实现了 17.4% 的外量子效率 (EQE) 和低效率滚降，与不含 Ti ₃ C ₂的 LED 相比，提高了 22.5% 。