Lu Po, Wu Jinlei, Shen Xinyu, Gao Xupeng, Shi Zhifeng, Lu Min, Yu William W, Zhang Yu
State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China.
Adv Sci (Weinh). 2020 Oct;7(19):e2001562. doi: 10.1002/advs.202001562. Epub 2020 Aug 16.
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 Ti C is applied as electron transport layers (ETLs) and the influence of the Ti C MXene in all-inorganic metal halide perovskite nanocrystal light-emitting diodes (perovskite NC LEDs) is explored. The addition of Ti C 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% Ti C , which is a 22.5% improvement compared to LEDs without Ti C .
被称为MXenes的二维过渡金属碳化物、氮化物和碳氮化物，由于其优异的物理和化学性质，在许多应用中表现出卓越的性能。在此，将具有不同TiC含量的ZnO-MXene混合物用作电子传输层（ETL），并探究了TiC MXene在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）中的影响。TiC的添加通过改变ETL的能级结构和电子迁移率，使LED中的电荷载流子传输更加平衡。此外，ETL具有更低的表面粗糙度，从而保证了钙钛矿NCs层的均匀分布，并进一步降低了漏电流。结果，含10%TiC的LED实现了17.4%的外量子效率（EQE）且效率滚降较低，与不含TiC的LED相比提高了22.5%。
