Dąbczyński Paweł, Marzec Mateusz M, Pięta Łukasz, Fijałkowski Konrad, Raczkowska Joanna, Bernasik Andrzej, Budkowski Andrzej, Rysz Jakub
Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, ul. Łojasiewicza 11, 30-348 Kraków, Poland.
Academic Centre for Materials and Nanotechnology and Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-049 Kraków, Poland.
ACS Omega. 2018 Apr 2;3(4):3631-3639. doi: 10.1021/acsomega.8b00029. eCollection 2018 Apr 30.
The surface properties of poly(3,4-ethylenedioxythiophene):(polystyrene sulfonate) (PEDOT:PSS) affect the performance of many organic electronic devices. The work function determines the efficiency of the charge carrier transfer between PEDOT:PSS electrodes and the active layer of the device. The surface free energy affects phase separation in multicomponent blends that are typically used to fabricate active layers of organic light-emitting diodes and photovoltaic devices. Here, we present a method to prepare PEDOT:PSS films with a gradient work function and surface free energy. This modification was achieved by evaporation of trimethoxy(3,3,3-trifluoropropyl)silane in such a way that the degree of surface coverage of the molecules varied in the selected direction. Gradient films were used as electrodes to fabricate two-terminal PEDOT:PSS/poly(3-hexyl thiophene)/Au devices to rapidly screen for the influence of the modification on the performance of the prepared polymer diodes. Gradual changes in the morphology of the solution-cast model poly(3-butyl thiophene)/poly-bromostyrene films followed changes in the surface energy of the substrate.
聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）的表面性质会影响许多有机电子器件的性能。功函数决定了PEDOT:PSS电极与器件有源层之间电荷载流子转移的效率。表面自由能会影响多组分共混物中的相分离，而多组分共混物通常用于制造有机发光二极管和光伏器件的有源层。在此，我们提出一种制备具有梯度功函数和表面自由能的PEDOT:PSS薄膜的方法。这种改性是通过蒸发三甲氧基（3,3,3-三氟丙基）硅烷来实现的，使得分子的表面覆盖度在选定方向上变化。梯度薄膜用作电极来制造两端PEDOT:PSS/聚（3-己基噻吩）/金器件，以快速筛选这种改性对所制备聚合物二极管性能的影响。溶液浇铸的模型聚（3-丁基噻吩）/聚溴苯乙烯薄膜的形态逐渐变化跟随了基底表面能的变化。
