Jewłoszewicz Beata, Bogdanowicz Krzysztof A, Przybył Wojciech, Iwan Agnieszka, Plebankiewicz Ireneusz
Military Institute of Engineer Technology, Obornicka 136 Str., 50-961 Wroclaw, Poland.
Polymers (Basel). 2020 Mar 4;12(3):565. doi: 10.3390/polym12030565.
Poly(3,4-ethylenedioxythiophene:poly(styrenesulfonate) (PEDOT:PSS) water and toluene solutions were investigated in detail, taking into consideration their stability, wettability, transparency, and electrochemical properties, along with change polarity caused by dopant. As dopant, methanol, ethanol, and isopropanol were used with different dipole moments (1.70, 1.69, and 1.66 D) and dielectric constants (33.0, 24.5, and 18.0). Three techniques, i.e., spin coating, doctor blade coating, and spray coating, were employed to created PEDOT:PSS layers on glass, glass/indium tin oxide (ITO), and glass/fluorine-doped tin oxide (FTO) substrates with optimized technical parameters for each used equipment. All used PEDOT:PSS water and toluene solutions demonstrated good wetting properties with angles below 30° for all used surfaces. Values of the energy bandgap (Eg) of PEDOT:PSS investigated by cyclic voltammetry (CV) in solution showed increase energy Eg along with addition of alcohol to the mixture, and they were found in the range of 1.20 eV to 2.85 eV. The opposite tendency was found for the Eg value of the PEDOT:PSS layer created from water solution. The storage effect on PEDOT:PSS layers detected by CV affected only the lowest unoccupied molecular orbital (LUMO) level, thereby causing changes in the energy bandgap. Finally, simple devices were constructed and investigated by infrared (IR) thermographic camera to investigate the surface defects on the created PEDOT:PSS layers. Our study showed that a more stable PEDOT:PSS layer without pin-holes and defects can be obtained from water and toluene solutions with isopropanol via the spin coating technique with an optimal speed of 3000 rpm and time of 90 s.
详细研究了聚（3,4 - 乙撑二氧噻吩：聚苯乙烯磺酸盐）（PEDOT:PSS）的水和甲苯溶液，考虑了它们的稳定性、润湿性、透明度和电化学性质，以及由掺杂剂引起的极性变化。作为掺杂剂，使用了具有不同偶极矩（1.70、1.69和1.66 D）和介电常数（33.0、24.5和18.0）的甲醇、乙醇和异丙醇。采用旋涂、刮刀涂布和喷涂三种技术，在玻璃、玻璃/氧化铟锡（ITO）和玻璃/氟掺杂氧化锡（FTO）基板上制备PEDOT:PSS层，并针对每种使用的设备优化了技术参数。所有使用的PEDOT:PSS水和甲苯溶液在所有使用的表面上均表现出良好的润湿性，接触角低于30°。通过循环伏安法（CV）在溶液中研究的PEDOT:PSS的能带隙（Eg）值显示，随着向混合物中添加醇，能带隙能量Eg增加，其值在1.20 eV至2.85 eV范围内。从水溶液制备的PEDOT:PSS层的Eg值呈现相反的趋势。通过CV检测到的PEDOT:PSS层的存储效应仅影响最低未占据分子轨道（LUMO）能级，从而导致能带隙发生变化。最后，构建了简单的器件并通过红外（IR）热成像相机进行研究，以检测所制备的PEDOT:PSS层上的表面缺陷。我们的研究表明，通过旋涂技术，以3000 rpm的最佳速度和90 s的时间，可以从含有异丙醇的水和甲苯溶液中获得更稳定、无针孔和缺陷的PEDOT:PSS层。
