Yu Yong, Wang Heyong, Xu Weidong, Kuang Chaoyang, Ji Fuxiang, Braun Slawomir, Liu Xianjie, Yi Chang, Gao Feng, Fahlman Mats
Laboratory of Organic Electronics, ITN, Linköping University, Norrköping SE-60221, Sweden.
Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-58183, Sweden.
ACS Appl Mater Interfaces. 2020 Jun 3;12(22):24965-24970. doi: 10.1021/acsami.0c02217. Epub 2020 May 22.
Quasi-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.
