Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films have drawn extensive attention as one of the most promising flexible transparent conductive electrodes to replace traditional indium tin oxide. However, some critical issues, such as weak adhesion, vulnerability to moisture and detrimental acidic property, need to be addressed before the practical application and industrialization. Here, we propose a facile and effective strategy of interfacial crosslinking to further improve the flexibility and stability of PEDOT:PSS electrodes with high transparency and conductivity by introducing polyethyleneimine ethoxylated (PEIE) on the surface. The flexibility and stability of PEDOT:PSS electrodes with PEIE overcoating layer are significantly improved, which can be attributed to the interfacial crosslinking reaction between PEIE and PSS. Finally, flexible organic light-emitting didoes (OLEDs) are constructed based on the PEDOT:PSS electrodes modified by PEIE, and current efficiency is enhanced from 20.5 to 76.4 cd/A with a 2.7-fold enhancement, owning to the improved carrier balance. This study confirms that PEIE is effective in protecting the PEDOT:PSS films from mechanical damage and moisture attack, while maintaining the high conductive and transmittance, and illustrates a promising future in low-cost flexible optoelectronic devices employing PEDOT:PSS electrodes.

聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）薄膜作为替代传统铟锡氧化物的最有希望的柔性透明导电电极之一，已引起广泛关注。但是，在实际应用和工业化之前，需要解决一些关键问题，例如粘合力弱，易受潮和不利的酸性性质。在这里，我们提出一种界面交联的简便有效策略，通过在表面引入聚乙烯亚胺乙氧基化（PEIE）进一步提高具有高透明性和导电性的PEDOT：PSS电极的柔韧性和稳定性。带有PEIE外涂层的PEDOT：PSS电极的柔性和稳定性得到了显着改善，这可以归因于PEIE和PSS之间的界面交联反应。最后，基于PEIE修饰的PEDOT：PSS电极构建了柔性有机发光二极管（OLED），由于改善了载流子平衡，电流效率从20.5 cd / A提高到了76.4 cd / A。这项研究证实，PEIE可有效保护PEDOT：PSS膜免受机械损伤和湿气侵袭，同时保持高导电性和透射率，并说明采用PEDOT：PSS电极的低成本柔性光电器件的发展前景广阔。拥有改善的运营商余额。这项研究证实，PEIE可有效保护PEDOT：PSS膜免受机械损伤和湿气侵袭，同时保持高导电性和透射率，并说明采用PEDOT：PSS电极的低成本柔性光电器件的发展前景广阔。拥有改善的运营商余额。这项研究证实，PEIE可有效保护PEDOT：PSS膜免受机械损伤和湿气侵袭，同时保持高导电性和透射率，并说明采用PEDOT：PSS电极的低成本柔性光电器件的发展前景广阔。