Photopatternable\nand Highly Conductive PEDOT:PSS Electrodes\nfor Flexible Perovskite Light-Emitting Diodes

Abstract

Flexible perovskite light-emitting\ndiodes (PeLEDs) constitute an\nemerging technology opening new opportunities in the fields of lighting\nand display for portable and wearable electronics. Poly(3,4-ethylenedioxythiophene):poly(stryrenesulfonate)\n(PEDOT:PSS) as one of the most promising flexible electrode materials\nhas attracted extensive attention. However, the patterning and conductivity\nissues of PEDOT:PSS electrodes should be addressed primarily. Here,\na photopolymerizable additive is proposed to endow the PEDOT:PSS electrodes\nwith photopatternability. Moreover, this additive can also improve\nthe conductivity of the PEDOT:PSS electrode from 0.16 to 627 S/cm\nbecause of the phase separation between PEDOT and PSS components and\nconformation transition of PEDOT chains. Eventually, highly conductive\nPEDOT:PSS electrodes with various patterns are applied in flexible\nPeLEDs, demonstrating a high luminance of 25972 cd/m² and\na current efficiency of 25.1 cd/A. This work provides a facile and\neffective method of patterning and improving the conductivity of PEDOT:PSS\nelectrodes simultaneously, demonstrating the great potential of PEDOT:PSS\nelectrodes in flexible perovskite optoelectronics.