High‐Efficiency Air‐Processed Si‐Based Perovskite Light‐Emitting Devices via PMMA‐TBAPF<sub>6</sub> Co‐Doping
Xiaoxiao Xu, Ting Zhu, Ke Xiao, Yu Zhu, Jiaming Chen, Dongke Li, Ling Xu, Jun Xu, Kunji Chen
Abstract
Abstract The preparation of high‐efficiency perovskite light‐emitting devices (PeLEDs) in the air‐ambient has always been a challenge. Herein, the authors propose a Si‐based near‐infrared air‐processed PeLED through the anti‐solvent engineering. Two materials, poly(methyl methacrylate) (PMMA) and tetrabutylammonium hexafluorophosphate (TBAPF 6 ) are co‐doped into the anti‐solvent, the former protects the perovskite from degradation in a high‐humidity atmosphere, and the latter passivates the defects on perovskite surface and increases the conductivity. Through the anti‐solvent engineering, the efficiency of PeLEDs has been significantly enhanced and obtains a maximum external quantum efficiency (EQE) of 10.4%, which is the highest among similar devices. This work shows that it is possible to prepare high‐efficiency near‐infrared PeLEDs in air‐ambient through a simple method.