Understanding the Correlation between the Crystallization Kinetics and Defect Formation in (FA)1.5Cs0.5AgBi(Cl0.75Br0.25)6 Double Perovskites

Tejas Dhanalaxmi Raju, Hojin Lee, Vignesh Murugadoss, Pavan Kumar Odugu, Wanqi Ren, Jang Hyuk Kwon, Tae Geun Kim

Research output: Contribution to journalArticlepeer-review


Double perovskites, particularly Cs2AgBiCl6, have attracted substantial attention as promising alternatives to lead-halide perovskites because they are environmentally friendly. However, the integration of these double perovskites into light-emitting diodes (LEDs) remains challenging because of their poor performance, which is primarily attributed to a limited understanding of the correlation between crystallization and defect formation. In this study, deep-trap defects caused by B-site antisites and vacancies are introduced into the double perovskite formamidinium (FA)1.5Cs0.5AgBi(Cl0.75Br0.25)6 lattice during crystallization. Remarkably, valeric acid suppresses antisites and facilitates the formation of distinct nanocrystals with a structurally ordered double perovskite. Poly(ethylene oxide) encapsulates the perovskites in situ and passivates surface defects by modifying the grain boundaries. In this manner, the coadditive strategy boosts the performance of the double-perovskite-based deep blue LED with a record external quantum efficiency of 1.8% and peak luminance of 280 Cd/m2. This study significantly advances our understanding of double perovskites and provides new perspectives for future investigations.

Original languageEnglish
Pages (from-to)468-477
Number of pages10
JournalACS Energy Letters
Issue number2
Publication statusPublished - 2024 Feb 9

Bibliographical note

Publisher Copyright:
© 2024 American Chemical Society.

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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