Self-Organized Carbazole Phosphonic Acid Additives at Buried Interface Enhance Efficiency of Blue Perovskite LEDs,ACS Energy Letters

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Self-Organized Carbazole Phosphonic Acid Additives at Buried Interface Enhance Efficiency of Blue Perovskite LEDs
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-09-03 , DOI: 10.1021/acsenergylett.4c01674
Guangruixing Zou _{1,

2} , Zhaohua Zhu _{1,

2} , Zixin Zeng _{1,

2} , Zhiqiang Guan _{2,

3} , Nan Zhang _{1,

2} , Wenlin Jiang ₃ , Ziming Chen ₄ , Ye Wu _{1,

2} , Desui Chen ₁ , Francis R. Lin ₃ , Sai-Wing Tsang _{1,

2} , Chun-Sing Lee _{2,

3} , Andrey L. Rogach ₁ , Alex K.-Y. Jen _{1,

3,

5} , Hin-Lap Yip _{1,

2,

5,

6}

Affiliation

Carbazole phosphonic acids (CPAs) that are used in self-assembled monolayers (SAMs) are well-reported. Yet, an understanding of their broader application still needs to be fully established. In this work, we demonstrate that incorporating CPAs into blue quasi-2D perovskite precursors as additives is an effective strategy for fine-tuning phase distribution and enhancing the radiative characteristics of the resultant films. [2-(9H-Carbazol-9-yl)ethyl]phosphonic acid (2PACz) emerges as the most effective molecule for improving device performance. Significantly, when the perovskite film is deposited onto a hole injection structure of ITO/Mg_0.1Ni_0.9O_x/SAM/poly(9-vinylcarbazole) (PVK), 2PACz preferentially migrates to the PVK/perovskite interface. This phenomenon is driven by the strong interaction between the carbazole components of both PVK and 2PACz, leading to a stabilized interface. Coupled with the controlled phase distribution of the perovskite, this approach results in a marked increase in external quantum efficiency for blue perovskite LEDs, advancing from 11% to beyond 15%. These insights underscore the versatility of CPAs in the development of high-efficiency optoelectronic devices.

中文翻译：

埋入界面处的自组织咔唑膦酸添加剂提高了蓝色钙钛矿 LED 的效率

用于自组装单层膜 (SAM) 的咔唑膦酸 (CPA) 已有大量报道。然而，对其更广泛应用的理解仍需要充分建立。在这项工作中，我们证明将 CPA 作为添加剂掺入蓝色准二维钙钛矿前驱体中是微调相分布和增强所得薄膜的辐射特性的有效策略。 [2-(9H-咔唑-9-基)乙基]膦酸 (2PACz) 成为提高器件性能最有效的分子。值得注意的是，当钙钛矿薄膜沉积到ITO/Mg _0.1 Ni _0.9 O _x /SAM/聚（9-乙烯基咔唑）（PVK）的空穴注入结构上时，2PACz优先迁移到PVK/钙钛矿界面。这种现象是由 PVK 和 2PACz 的咔唑组分之间的强相互作用驱动的，从而形成稳定的界面。与钙钛矿的受控相分布相结合，这种方法使蓝色钙钛矿 LED 的外部量子效率显着提高，从 11% 提高到 15% 以上。这些见解强调了 CPA 在高效光电器件开发中的多功能性。

更新日期：2024-09-03

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