Journal
ACS PHOTONICS
Volume 7, Issue 8, Pages 1915-1922Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00497
Keywords
tin-based halide perovskites; naphthol sulfonic salt additive; interfacial passivation; antioxidant; pure-red emission; perovskite light-emitting diodes
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Funding
- National Natural Science Foundation of China (NSFC) [51771132, 21771114, 51972175]
- MOE 111 [B12015]
- Natural Science Foundation of Tianjin [17JCYBJC40900, 18YFZCGX00580]
- Recruitment Program of Global Youth Experts of China
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Tin halide perovskites are promising lead-free candidates for light-emitting diodes (LEDs), but their performance is hindered by the poor crystallinity quality and the oxidation of tin. It is necessary but challenging to simultaneously realize modulating crystallization, suppressing oxidation, and passivating defects to boost the device's performance. Here, naphthol sulfonic salt is demonstrated as an effective multifunctional additive. The sulfonic group can retard crystallization by forming intermediate complexes with perovskite to form a pinhole-free film. The reducing hydroxyl group can prevent Sn2+ from oxidation and hinder the migration of I - ions. The high electron density of the naphthol ring can enhance the electrostatic attraction toward undercoordinated Sn2+ to passivate the defects. The synergistic effect of the multifunctional additive contributes to a boosted efficiency of 0.72% and a brightness of 132 cd m(-2) for quantum-well structure phenethylammonium tin iodide ((PEA)(2)SnI4) LEDs, which represents the most effective lead-free perovskite LEDs in pure-red regions as far as we know.
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