Boosting CsSnI3-based near-infrared perovskite lightemitting diodes performance via solvent coordination engineering

• Journal:InfoMat
• Abstract:Due to their unique photoelectric properties, nontoxic tin-based perovskites are emerging candidates for efficient near-infrared LEDs. However, the facile oxidation of Sn2+ and the rapid crystallization rate of tin-based perovskites result in suboptimal film quality, leading to inferior efficiencies of tin-based perovskite light-emitting diodes (Pero-LEDs). In this study, we investigate the influence of commonly used solvents on the quality of the CsSnI3 films. Remarkably, DMSO exhibits a stronger interaction with SnI2, forming a stable intermediate phase of SnI2
  3DMSO. This intermediate effectively inhibits the oxidation of Sn2+ and slows down the crystallization rate, bringing in lower defect state density and higher photoluminescence quantum yield of the prepared perovskite films. Consequently, the corresponding Pero-LEDs achieve a maximum external quantum efficiency (EQE) of 5.6%, among the most efficient near-infrared Pero-LEDs. In addition, the device processes ultra-low efficiency roll-off and high reproducibility. Our research underscores the crucial role of solvent-perovskite coordination in determining film quality. These findings offer valuable guidance for screening solvents to prepare highly efficient and stable tin-based perovskites.
• Indexed by:Journal paper
• Discipline:Engineering
• First-Level Discipline:Materials Science and Engineering
• Volume:6
• Issue:5
• Page Number:e12537
• ISSN No.:2567-3165
• Translation or Not:no
• Date of Publication:2024-02-01
• Included Journals:SCI
• DOI number:10.1002/inf2.12537
• Impact Factor:22.7
• Links to published journals:https://onlinelibrary.wiley.com/doi/10.1002/inf2.12537