Finally, inkjet-printed metal halide perovskite LEDs – utilizing seed crystal templating of salty PEDOT:PSS,Materials Horizons

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Finally, inkjet-printed metal halide perovskite LEDs – utilizing seed crystal templating of salty PEDOT:PSS
Materials Horizons ( IF 12.2 ) Pub Date : 2020-05-27 , DOI: 10.1039/d0mh00512f
Felix Hermerschmidt _{1,

2,

3,

4,

5} , Florian Mathies _{5,

6,

7,

8} , Vincent R. F. Schröder _{1,

2,

3,

4,

5} , Carolin Rehermann _{5,

6,

7,

8} , Nicolas Zorn Morales _{1,

2,

3,

4,

5} , Eva L. Unger _{5,

6,

7,

8,

9} , Emil J. W. List-Kratochvil _{1,

2,

3,

4,

5}

Affiliation

Solution-processable metal halide perovskites are increasingly implemented in perovskite-based light-emitting diodes (PeLEDs). Especially green PeLEDs based on methylammonium lead bromide (MAPbBr₃) composites exhibit impressive optoelectronic properties, while allowing processing by low-cost and upscalable printing methods. In this study, we have investigated the influence of potassium chloride (KCl) blended into the common hole injection material poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) to boost PeLED device performance. The inclusion of KCl firstly results in a change in morphology of the PEDOT:PSS layer, which then acts as a template during deposition of the perovskite layer. A MAPbBr₃:polyethylene glycol (PEG) composite was used, which does not require the deposition of an anti-solvent droplet to induce preferential perovskite crystallization and is therefore suitable for spin coating and scalable inkjet printing processes. PeLEDs utilizing the KCl induced templating effect on a planar PEDOT:PSS/MAPbBr₃:PEG architecture show improved performance, predominantly due to improved crystallization. PeLEDs incorporating spin-coated perovskite layers yield a 40-fold increase in luminance (8000 cd m⁻²) while the turn-on voltage decreases to 2.5 V. KCl-modified PEDOT:PSS contact layers enabled the realization of inkjet-printed PeLEDs with luminance increased by a factor of 20 at a maximum of 4000 cd m⁻² and a turn-on voltage of 2.5 V. This work paves the way for inkjet-printed perovskite light-emitting devices for a wide variety of low-cost and customizable applications.

中文翻译：

最后，喷墨印刷的金属卤化物钙钛矿LED –利用咸PEDOT：PSS的晶种模板

在基于钙钛矿的发光二极管（PeLED）中越来越多地采用可溶液处理的金属卤化物钙钛矿。尤其是基于甲基铵溴化铅（MAPbBr ₃）复合材料的绿色PeLED表现出令人印象深刻的光电性能，同时允许通过低成本和可升级的印刷方法进行加工。在这项研究中，我们研究了将氯化钾（KCl）掺入普通空穴注入材料聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT：PSS）对提高PeLED器件性能的影响。氯化钾的加入首先导致PEDOT：PSS层的形态发生变化，然后在钙钛矿层沉积过程中充当模板。MAPbBr ₃：使用了聚乙二醇（PEG）复合材料，该材料不需要沉积反溶剂液滴即可引发优先的钙钛矿结晶，因此适用于旋涂和可扩展的喷墨印刷工艺。在平面PEDOT：PSS / MAPbBr ₃：PEG结构上利用KCl诱导的模板效应的PeLED表现出改善的性能，这主要归因于结晶度的提高。掺有旋涂钙钛矿层的PeLED的亮度（8000 cd m ^-2）增加40倍，而开启电压降至2.5V。KCl改性的PEDOT：PSS接触层使喷墨印刷的PeLED能够实现最大4000 cd m ^-2时亮度增加20倍以及2.5 V的启动电压。这项工作为各种低成本和可定制应用的喷墨打印钙钛矿发光装置铺平了道路。

更新日期：2020-07-06

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