Flat, Luminescent, and Defect-Less Perovskite Films on PVK for Light-Emitting Diodes with Enhanced Efficiency and Stability,ACS Applied Electronic Materials

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Flat, Luminescent, and Defect-Less Perovskite Films on PVK for Light-Emitting Diodes with Enhanced Efficiency and Stability
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-10-26 , DOI: 10.1021/acsaelm.0c00569
Shichen Yuan ₁ , Boning Han ₁ , Tao Fang ₁ , Qingsong Shan ₂ , Jizhong Song ₁

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Metal-halide perovskites have broad application prospects in being emitters for light-emitting diodes (LEDs) on account of their remarkable photoelectric performance. Nevertheless, exciton quenching induced by the poor quality of perovskite films and mismatched energy levels between the perovskite layer and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) restricts device performance. This study presents poly(9-vinylcarbazole) (PVK) films processed by a polar solvent as the hole transport layer to construct efficient perovskite LEDs (PeLEDs). The perovskite film on PVK exhibited a smoother surface, smaller grain size, and fewer defects, which improved its luminescence properties in comparison to that formed on PEDOT:PSS. Moreover, the lower energy barrier between PVK and the emission layer improved the hole injection. Based on the high luminescence and electrical transport characteristics, the device exhibited improved performance with a peak external quantum efficiency reaching 10.59%. Furthermore, the LEDs showed excellent environmental and operational stability because the hydrophobic PVK shielded the perovskite from atmospheric moisture and restricted interfacial exciton quenching. These results demonstrate that the PVK is an effective hole injection and transport material that can be applied to photodetectors, solar cells, memristors, and similar devices.

中文翻译：

PVK上的平面，发光和无缺陷钙钛矿膜，用于发光二极管，具有增强的效率和稳定性

金属卤化物钙钛矿因其卓越的光电性能而在作为发光二极管（LED）的发射器方面具有广阔的应用前景。然而，由于钙钛矿膜质量差以及钙钛矿层与聚（3,4-乙撑二氧噻吩）-聚（苯乙烯磺酸盐）（PEDOT：PSS）之间的能级不匹配而引起的激子猝灭限制了器件性能。这项研究提出了一种由极性溶剂处理的聚（9-乙烯基咔唑）（PVK）薄膜作为空穴传输层，以构建有效的钙钛矿LED（PeLED）。与在PEDOT：PSS上形成的钙钛矿膜相比，PVK上的钙钛矿膜表现出更光滑的表面，更小的晶粒尺寸和更少的缺陷，从而改善了其发光性能。此外，PVK和发射层之间的较低能垒改善了空穴注入。基于高发光和电传输特性，该器件表现出改进的性能，峰值外部量子效率达到10.59％。此外，LED表现出出色的环境和操作稳定性，因为疏水性PVK可以保护钙钛矿免受大气水分和界面激子猝灭的限制。这些结果表明，PVK是一种有效的空穴注入和传输材料，可以应用于光电探测器，太阳能电池，忆阻器和类似器件。LED表现出出色的环境和操作稳定性，因为疏水性PVK可以保护钙钛矿免受大气中水分的影响，并限制了界面激子的猝灭。这些结果表明，PVK是一种有效的空穴注入和传输材料，可以应用于光电探测器，太阳能电池，忆阻器和类似器件。LED表现出出色的环境和操作稳定性，因为疏水性PVK可以保护钙钛矿免受大气中水分的影响，并限制了界面激子的猝灭。这些结果表明，PVK是一种有效的空穴注入和传输材料，可应用于光电探测器，太阳能电池，忆阻器和类似器件。

更新日期：2020-11-25

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