Seok Joo Yang, Dharini Varadharajan, Kagachi Tateno, Yu-Ting Yang, Jeong Hui Kim, Kevin R. Pedersen, Sung-Doo Baek, Hanjun Yang, Aidan H. Coffey, Kenneth R. Graham, Bryan W. Boudouris, Letian Dou
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Interfacial Molecular Engineering for Efficient Sn Perovskite Light-Emitting Diodes
In recent years, perovskite light-emitting diodes (PeLEDs) have demonstrated exceptional potential, achieving high external quantum efficiencies (EQEs) exceeding 20%. However, these advancements have primarily focused on visible colors, and toxic elements such as Pb are used in these devices. Tin (Sn) perovskites with a narrow band gap of nearly 1.3 eV present a promising candidate for lead-free near-infrared PeLEDs. Nonetheless, Sn oxidation and high defect density from fast crystallization are still hurdles to overcome. This study investigates the impact of a newly synthesized ethylenedioxythiophene (EDOT)-based conjugated organic ligand on Sn-based PeLEDs, aiming to enhance device performance by reducing the defect density and Sn oxidation. The EDOT-treated PeLED device achieves a high EQE of 6.4% and exhibits stable electroluminescence spectra, demonstrating the potential of ligand treatments in optimizing Sn-based PeLEDs.
期刊介绍:
Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.