A pyridine-capped quaterthiophene as an alternative to PEDOT:PSS, processable from organic solvents and without acidity, for more stable electronic devices.
A pyridine-capped quaterthiophene as an alternative to PEDOT:PSS, processable from organic solvents and without acidity, for more stable electronic devices.
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吡啶封端的四噻吩作为 PEDOT:PSS 的替代品，可在有机溶剂中加工且无需酸性，可用于更稳定的电子器件。
DOI：
10.1039/d3mh01060k
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发表时间：
2023
影响因子：
13.3
通讯作者：
Hussien EJ
中科院分区：
文献类型：
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作者：
Hussien EJ
聚（3，4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）是一种在有机电子领域中已经变得普遍存在的材料。它最常用作光电器件中的空穴传输层（HTL），并且可以以具有不同性质的各种配方商业购买。虽然它是一种最方便使用的材料，但存在与PEDOT：PSS相关的稳定性问题，这些问题对装置稳定性有害，并且这些问题是由于PSS组分的酸性。在本文中，我们提出了一种分子，非酸性的替代PEDOT：PSS。母体结构由一个quater（3，4-亚乙基二氧噻吩）单元组成，该单元在短链的任一侧用两个吡啶单元封端。这种化合物称为（BEDOTPy）2，可以通过化学和电化学方法制备，得到具有选择的抗衡阴离子的掺杂材料。通过在氮原子处季铵化的进一步官能化允许改变溶解度和成膜性质。掺杂样品的电导率可达3.75 S cm−1。该材料是非酸性的，因此是用于器件应用的PEDOT：PSS的有吸引力的替代品。我们展示了使用化合物（BEDOTPy-EtOH-I）2 PF 6作为HTL的OLED器件，并将器件性能与用PEDOT：PSS制成的器件性能进行比较。由于分子材料的非酸性性质，相应的OLED器件不显示亮度随时间的下降，而对于含有PEDOT：PSS的器件观察到短时间内的性能损失。提出这些结果以引入母体化合物（BEDOTPy）2作为PEDOT：PSS的有吸引力的替代物，其可以容易地进行化学改性以提供过多的具有可调性质的潜在化合物。
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a material that has become ubiquitous in the field of organic electronics. It is most commonly used as a hole transport layer (HTL) in optoelectronic devices and can be purchased commercially in various formulations with different properties. Whilst it is a most convenient material to work with, there are stability issues associated with PEDOT:PSS that are detrimental to device stability and these are due to the acidic nature of the PSS component. In this paper, we present a molecular, non-acidic alternative to PEDOT:PSS. The parent structure is composed of a quater(3,4-ethylenedioxythiophene) unit capped either side of the short chain with two pyridine units. This compound, termed (BEDOTPy)2, can be prepared chemically and electrochemically to give doped materials with a choice of counteranions. Further functionalisation via quaternisation at the nitrogen atoms allows for modification of solubility and film-forming properties. The conductivity of the doped samples can reach up to 3.75 S cm−1. The materials are non-acidic and are therefore attractive alternatives to PEDOT:PSS for device applications. We demonstrate an OLED device using the compound (BEDOTPy-EtOH-I)2PF6 as an HTL, and compare the device performance to one made with PEDOT:PSS. Due to the non-acidic nature of the molecular material, the corresponding OLED device does not show a drop in luminance over time, whereas a loss of performance is observed for the device containing PEDOT:PSS over a short period. These results are presented to introduce the parent compound (BEDOTPy)2 as an attractive alternative to PEDOT:PSS, which can be easily modified chemically to provide a plethora of potential compounds with tunable properties.