Journal
ADVANCED MATERIALS
Volume 34, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202206377
Keywords
environmental stability; MXenes; organic light-emitting diodes; perfluorosulfonic acid barrier layers; work function
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science, ICT & Future Planning) [NRF-2016R1A3B1908431]
- Pioneer Research Center Program through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [NRF-2022M3C1A3081211]
- LG Display under LGD-SNU Incubation Program [2021005682]
- US National Science Foundation [DMR-2041050]
- US National Science Foundation Graduate Research Fellowship [DGE-1646737]
- U.S. Department of Education Graduate Assistance in Areas of National Need (GAANN) fellowship
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The study presents a promising Ti3C2Tx MXene film as an electrode for organic light-emitting diodes, demonstrating excellent environmental stability and high WF. The research shows that the thermal-treated Ti3C2Tx structure and PFSA surface modification can effectively suppress the impact of environmental contamination on electrode performance.
MXenes constitute a rapidly growing family of 2D materials that are promising for optoelectronic applications because of numerous attractive properties, including high electrical conductivity. However, the most widely used titanium carbide (Ti3C2Tx) MXene transparent conductive electrode exhibits insufficient environmental stability and work function (WF), which impede practical applications Ti3C2Tx electrodes in solution-processed optoelectronics. Herein, Ti3C2Tx MXene film with a compact structure and a perfluorosulfonic acid (PFSA) barrier layer is presented as a promising electrode for organic light-emitting diodes (OLEDs). The electrode shows excellent environmental stability, high WF of 5.84 eV, and low sheet resistance R-S of 97.4 omega sq(-1). The compact Ti3C2Tx structure after thermal annealing resists intercalation of moisture and environmental contaminants. In addition, the PFSA surface modification passivates interflake defects and modulates the WF. Thus, changes in the WF and R-S are negligible even after 22 days of exposure to ambient air. The Ti3C2Tx MXene is applied for large-area, 10 x 10 passive matrix flexible OLEDs on substrates measuring 6 x 6 cm. This work provides a simple but efficient strategy to overcome both the limited environmental stability and low WF of MXene electrodes for solution-processable optoelectronics.
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