Zhao Yonggang, Su Hao, Liu Qiming, Zhang Li, Lv Mingzhi, Jiao Chaohui, Cheng Pu, Liu Dequan, He Deyan
Key Laboratory of Special Functional Materials and Structure Design of Ministry of Education, School of Physical Science and Technology Lanzhou University, Lanzhou 730000, China.
ACS Omega. 2020 Mar 25;5(13):7545-7554. doi: 10.1021/acsomega.0c00355. eCollection 2020 Apr 7.
In this study, a simple and novel mechanical pressure treatment (MPT) was used to effectively improve the electrical and optical properties of ethylene glycol (EG)-doped PEDOT:PSS (EG-PEDOT:PSS) thin films, one of the most successful organic conductor materials ever which is are widely used in organic electronics because of their admirable film-forming property, high light transmittance, and excellent thermal stability. It is found that the conductivity of the EG-PEDOT:PSS films increased by 32% due to dramatically enhanced carrier mobility because an MPT improves the phase separation between PEDOT and PSS and then yields an interpenetrating conductive network. Meanwhile, the transmittance of the EG-PEDOT:PSS films in the near-infrared band was enhanced, and the surface roughness was reduced. These thin films retain their incredible flexibility as well; after 5000 times of 180° bending, the sheet resistance is basically unchanged. Considering that this MPT approach is already well developed in industrial applications, it is very hopeful to extend this technique in the field of organic electronics.
在本研究中，一种简单新颖的机械压力处理（MPT）被用于有效改善乙二醇（EG）掺杂的聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（EG-PEDOT:PSS）薄膜的电学和光学性能。EG-PEDOT:PSS薄膜是最成功的有机导体材料之一，因其具有良好的成膜性、高透光率和出色的热稳定性而被广泛应用于有机电子学领域。研究发现，EG-PEDOT:PSS薄膜的电导率提高了32%，这是由于载流子迁移率显著增强，因为MPT改善了PEDOT和PSS之间的相分离，进而产生了互穿导电网络。同时，EG-PEDOT:PSS薄膜在近红外波段的透光率提高，表面粗糙度降低。这些薄膜还保持了令人难以置信的柔韧性；在180°弯曲5000次后，薄层电阻基本不变。鉴于这种MPT方法在工业应用中已经得到很好的发展，在有机电子学领域扩展这项技术非常有希望。
