Enhancing Performance and Stability of Tin Halide Perovskite Light Emitting Diodes via Coordination Engineering of Lewis Acid–Base Adducts
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초록
내용
For resolving toxicity issues of Pb-based perovskites, the Sn-based perovskites have been widely studied as a promising candidate to replace Pb-based perovskites due to the similar valence electron configuration between Sn2+ and Pb2+. However, the desired Sn2+ in the precursor solution and film is easily oxidized to Sn4+ to cause detrimental Sn vacancies and impurities in the films. Herein, we propose N,N′-dimethylpropyleneurea (DMPU) as an alternative Lewis base for the fabrication of stable and high quality Sn-based perovskite thin films. We unraveled that the strongly coordinating Lewis base DMPU can suppress oxidation of Sn2+ in the precursor solution while promoting growth of uniform and highly crystalline perovskite thin films. The perovskite light emitting diode (PeLED) device based on the PEA2SnI4 demonstrated maximum L and EQE of 68.84 cd/m2 and 0.361%, respectively.