柔性电子材料PEDOT:PSS的光电性能优化及机理研究

Flexible electronic devices have important applications in many areas, such as displays, robots, wearable electronics, military, and healthcare equipment. Apart from the active materials, a flexible electronic device requires flexible electrodes. However, traditional electrode materials like Indium tin oxide (ITO) are not flexible and have high price. Therefore, there is strong demand for new materials with both high flexibility and conductivity. PEDOT:PSS exhibits excellent film-forming properties, transparency and flexibility, thus is potentially to become the next-generation transparent electrode material. However, PEDOT:PSS currently suffers from low electrical conductivity. The project aims to reveal the conductivity limit of PEDOT: PSS thin films, which hopefully could completely remove the excess insulating PSS component in the film. Novel methods will be developed for synthesis a printable PEDOT:PSS solution with improved conductivity. Next, PEDOT:PSS film and fibre will be prepared through the solution. The conductivity of PEDOT:PSS film and fibre will be further improved through solvent treatment. The project will study the effects of different polymerization condition, solvent structure, treatment temperature and other experimental conditions on the conductivity. Then characterize the film structure, PSS distribution as well as optical and electrical properties of treated PEDOT:PSS films, thus understand the microstructure and propose electrical conduction mechanism; and ultimately, explore its potential application as flexible transparent electrodes in flexible electronics like flexible optoelectronic device and wearable devices The successful development of PEDOT: PSS-based highly transparent and conductive electrode material will have important scientific significance and commercial value.

柔性电极材料是柔性电子器件中必不可少的部分，目前常用的电极材料价格昂贵且柔韧性很差，因此迫切需要开发成本低柔性好的导电材料。PEDOT:PSS具备良好的成膜性、透光性和柔性，很有潜力成为下一代柔性透明电极材料。然而其目前存在电导率低的问题。本项目旨在研发一种具有更高导电性能的PEDOT:PSS溶液，用于制备PEDOT:PSS导电薄膜和导电纤维，并对PEDOT:PSS薄膜和纤维进行溶剂处理，力争完全去除绝缘的PSS组分，达到PEDOT:PSS的极限电导率，通过对不同溶剂和处理方法对PEDOT:PSS的结构、成分分布、光电特性的影响进行表征，了解其微观形貌并提出导电机制，进一步提升PEDOT:PSS的光电性能，最终将其作为柔性透明电极和柔性导电纤维应用在柔性光电器件和可穿戴设备等柔性电子器件中。成功开发基于PEDOT:PSS的柔性电极材料具有重要的科学意义和商业价值。

柔性电子器件具有柔软、轻便、可大面积应用等特性，在军事、医疗、可穿戴智能设备等很多领域有广泛的应用。柔性电极材料是柔性电子器件中必不可少的部分，目前常用的无机电极材料价格昂贵且柔韧性很差，因此迫切需要开发成本低柔性好的导电材料。PEDOT:PSS具备良好的成 膜性、透光性和柔性，很有潜力成为下一代柔性透明电极材料。然而其目前存在电导率低的问题。本项目使用极性溶剂处理将PEDOT:PSS薄膜的电导率提高到大于1000 S/cm，并将其作为柔性透明电极应用在柔性有机太阳能电池中。制备的柔性太阳能电池的性能和使用传统无机电极的电池性能相差无几。此外，本项目还通过在PEDOT:PSS溶液中添加磁性纳米颗粒研制成功了一种同时具备磁性和导电性的新型多功能薄膜。此薄膜的电导率能达到1080 S/cm，同时它还具有25.5 emu/g的饱和磁性和超过40 dB的电磁屏蔽效能。这种薄膜还具有高透明度、柔韧性好、成本低、重量轻等优点。本项目还研发了导电纤维和多功能复合纤维，在柔性电子领域和智能可穿戴设备等领域有重要应用前景。