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Dimensional Tailoring of Ultrahigh Vacuum Annealing-Assisted Quantum Wells for the Efficiency Enhancement of Perovskite Light-Emitting Diodes
journal contribution
posted on 2020-05-22, 20:08 authored by Yong Yu, Heyong Wang, Weidong Xu, Chaoyang Kuang, Fuxiang Ji, Slawomir Braun, Xianjie Liu, Chang Yi, Feng Gao, Mats FahlmanQuasi-two-dimensional (Q-2D) perovskites
featured with multidimensional
quantum wells (QWs) have been the main candidates for optoelectronic
applications. However, excessive low-dimensional perovskites are unfavorable
to the device efficiency due to the phonon–exciton interaction
and the inclusion of insulating large organic cations. Herein, the
formation of low-dimensional QWs is suppressed by removing the organic
cation 1-naphthylmethylamine iodide (NMAI) through ultrahigh vacuum
(UHV) annealing. Perovskite light-emitting diode (PLED) devices based
on films annealed with optimized UHV conditions show a higher external
quantum efficiency (EQE) of 13.0% and wall-plug efficiency of 11.1%
compared to otherwise identical devices with films annealed in a glovebox.