Photopatternable and Highly Conductive PEDOT:PSS Electrodes for Flexible Perovskite Light-Emitting Diodes

• Published in: ACS applied materials & interfaces Vol. 15; no. 17; pp. 21344 - 21353
• Main Authors: Liu, Lihui, Yang, Hao, Zhang, Zhongjin, Wang, Yun, Piao, Junxian, Dai, Yujun, Cai, Bo, Shen, Wei, Cao, Kun, Chen, Shufen
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 03.05.2023
• Subjects: Organic Electronic Devices; pattern; flexible electronics; photopolymerization; perovskite; PEDOT:PSS
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.3c03108

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