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Suppressing Metal Cation Diffusion in Perovskite Light-Emitting Diodes via Blending Amino Acids with PEDOT:PSS
ACS Photonics ( IF 6.5 ) Pub Date : 2025-01-23 , DOI: 10.1021/acsphotonics.4c02027
Joonseok Kim, Min-Gi Jeon, Subin Yun, Artavazd Kirakosyan, Jihoon Choi

While the migration of halide anions in the perovskite lattice has been extensively studied owing to the undesirable shifts in the emission spectrum of perovskite light-emitting diodes (PeLEDs), the diffusion behavior of doped metal cations in perovskite crystals during device operation remains hitherto unexplored. Therefore, gaining a deep understanding and developing mitigation strategies for ion migration are crucial to achieving the full potential of the PeLED technology. In this study, we analyzed the feasibility of using of amino acids as interlayer additives in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) to block metal cation migration and passivate surface defects in Na+-doped CsPbBr3 films. We systematically selected and analyzed a series of amino acids (l-leucine, l-lysine, and l-glutamine) and found that blending PEDOT:PSS with l-lysine significantly suppressed Na+ diffusion and enhanced the external quantum efficiency (EQE) of the CsPbBr3 PeLEDs. This result was attributed to the chelating ability of l-lysine with amine and carboxyl groups, which form strong coordination bonds with the metal cations. Furthermore, the l-lysine with two amine groups improved the crystallization quality of CsPbBr3 films with reduced surface roughness and improved surface passivation, leading to increased photoluminescence quantum yields. Overall, the modified CsPbBr3 PeLEDs with l-lysine-blended PEDOT:PSS exhibited much improved device performance, such as EQE and luminance. Our results provide insights into the role of amino acid additives in enhancing the performances and stabilities of perovskite-based optoelectronic devices.

中文翻译:


通过将氨基酸与 PEDOT:PSS 混合来抑制钙钛矿发光二极管中的金属阳离子扩散



虽然由于钙钛矿发光二极管 (PeLED) 发射光谱的不良变化,卤化物阴离子在钙钛矿晶格中的迁移已被广泛研究,但掺杂金属阳离子在钙钛矿晶体中器件运行期间的扩散行为迄今仍未得到探索。因此,深入了解和制定离子迁移缓解策略对于充分发挥 PeLED 技术的潜力至关重要。在本研究中,我们分析了在聚(3,4-乙烯二氧噻吩):p oly(苯乙烯磺酸盐)(PEDOT:PSS) 中使用氨基酸作为层间添加剂以阻止金属阳离子迁移并钝化 Na+ 掺杂 CsPbBr3 薄膜表面缺陷的可行性。我们系统地选择和分析了一系列氨基酸 (l-亮氨酸、l-赖氨酸和 l-谷氨酰胺),发现将 PEDOT:PSS 与 l-赖氨酸混合显着抑制了 Na + 扩散并增强了 CsPbBr3 PeLED 的外部量子效率 (EQE)。这一结果归因于 l-赖氨酸与胺基和羧基的螯合能力,胺基和羧基与金属阳离子形成强配位键。此外,具有两个胺基的 l-赖氨酸提高了 CsPbBr3 薄膜的结晶质量,降低了表面粗糙度并改善了表面钝化,从而提高了光致发光量子产率。总体而言,具有 l-赖氨酸混合 PEDOT:PSS 的改性 CsPbBr3 PeLED 表现出显着改善的器件性能,例如 EQE 和亮度。我们的结果为氨基酸添加剂在增强基于钙钛矿的光电器件的性能和稳定性方面的作用提供了见解。
更新日期:2025-01-24
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