<br>PEDOT:PSS 空穴传输层中离子添加剂对高效蓝色钙钛矿发光二极管的影响,ACS Applied Materials & Interfaces

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PEDOT:PSS 空穴传输层中离子添加剂对高效蓝色钙钛矿发光二极管的影响
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-03-07 , DOI: 10.1021/acsami.3c01024
Huei Min Chua ₁ , Natalia Yantara ₂ , Yeow Boon Tay ₁ , Suriani Abdul Latiff ₁ , Subodh Mhaisalkar _{1,

2} , Nripan Mathews _{1,

2}

Affiliation

Ruddlesden-Popper (RP) 钙钛矿由于其独特的能量漏斗机制（可增强光致发光强度）和尺寸控制（可实现光谱调谐），在高效或发蓝光的钙钛矿发光二极管 (PeLED) 的开发中越来越受到关注。。在传统的 pin 器件结构中，RP 钙钛矿薄膜的质量（包括晶粒形态和缺陷）以及器件性能会受到下面的空穴传输层 (HTL) 的显着影响。聚(3,4-乙撑二氧噻吩):聚(苯乙烯磺酸)(PEDOT:PSS) 由于其高导电性和光学透明性，通常在多种 PeLED 中用作 HTL。尽管如此，PEDOT:PSS 引起的能级失配和激子猝灭往往会影响 PeLED 的性能。在此，我们研究了通过在 PEDOT:PSS HTL 中添加功函数可调的 PSS Na 来减轻这些影响，并评估对蓝色 PeLED 性能的影响。改性 PEDOT:PSS HTL 的表面分析揭示了富含 PSS 的层，可减轻 HTL/钙钛矿界面处的激子猝灭。在添加 6% PSS Na 的最佳浓度下，观察到外部量子效率的提高，冠军蓝色和天蓝色 PeLED 分别达到 4% (480 nm) 和 6.36% (496 nm)，同时运行稳定性为延长了四倍。

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Influence of Ionic Additives in the PEDOT:PSS Hole Transport Layers for Efficient Blue Perovskite Light Emitting Diodes

Ruddlesden–Popper (RP) perovskites have been gaining traction in the development of high-efficiency or blue-emitting perovskite light emitting diodes (PeLEDs) due to the unique energy funneling mechanism, which enhances photoluminescence intensity, and dimensional control, which enables spectral tuning. In a conventional p-i-n device structure, the quality of RP perovskite films, including grain morphology and defects, as well as device performance can be significantly influenced by the underlying hole-transport layer (HTL). Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is commonly used in several PeLEDs as an HTL because of its high electrical conductivity and optical transparency. Nonetheless, the energy level mismatch and exciton quenching caused by PEDOT:PSS often compromises PeLED performance. Herein, we investigate the mitigation of these effects through addition of work-function-tunable PSS Na to the PEDOT:PSS HTL and assess the impact on blue PeLED performance. Surface analysis of the modified PEDOT:PSS HTLs reveals a PSS-rich layer that alleviates exciton quenching at the HTL/perovskite interface. At an optimal concentration of 6% PSS Na addition, an improvement in the external quantum efficiency is observed, with champion blue and sky-blue PeLEDs achieving 4% (480 nm) and 6.36% (496 nm), respectively, while operation stability is prolonged by fourfold.

更新日期：2023-03-07

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