Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 9, Issue 48, Pages 17518-17525Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc04649g
Keywords
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Funding
- National Key R&D Program of China [2018YFA0703200]
- National Nature Science Foundation of China [22175185, 52003276, 51803217, 51773206, 91963212, 51961145102, 22002171]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-202005, 2019BMS20003]
- K. C. Wong Education Foundation
- China Postdoctoral Science Foundation [2020M670466]
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A vapor-induced coating method was developed to fabricate highly conductive and transparent PEDOT:PSS thin films with a conductivity of 4227 S cm(-1) and transparency of 90%, outperforming traditional coating methods. These films can serve as electrodes for perovskite solar cells, showcasing significant potential for efficient and simplified solution-processing methods of organic functional films.
The meniscus-guided coating (MGC) is an efficient solution-processing method for preparing organic functional films. However, the uniform shear stress and mass transfer in the liquid meniscus is still challenging for large-area fabrication of organic functional films. Herein, we report a vapor-induced coating approach to fabricate highly conductive and transparent PEDOT:PSS thin films. The mechanism and morphology regulation rule for film fabrication via vapor-induced coating have been systematically studied. The vapor-induced coating is an intrinsically contactless and spontaneous meniscus-guided method, in which the vapor molecules not only induce the spontaneous dewetting of the liquid film but also behave as a direct dopant for PEDOT:PSS thin films to improve electrical conductivity. The resulting PEDOT:PSS thin films reach a conductivity up to 4227 S cm(-1) when combined with H2SO4 post-treatment and excellent transparency of 90%, exhibiting a much better performance as electrodes for perovskite solar cells (PSCs) than the films obtained by conventional meniscus-guided methods. Besides, the patterning PEDOT:PSS films can be successfully constructed using pre-patterned substrates and used as electrodes for organic field-effect transistors (OFETs). The results are of significance for the development of efficient and simplified solution-processing methods of organic functional films.
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