Overcoming the Limitations of MXene Electrodes for Solution-Processed Optoelectronic Devices.
basic_science · Level V
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- Record sourced from PubMed, PMID 36037306.
- Also identified by DOI 10.1002/adma.202206377.
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Abstract
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 (Ti<sub>3</sub> C<sub>2</sub> T<sub>x</sub> ) MXene transparent conductive electrode exhibits insufficient environmental stability and work function (WF), which impede practical applications Ti<sub>3</sub> C<sub>2</sub> T<sub>x</sub> electrodes in solution-processed optoelectronics. Herein, Ti<sub>3</sub> C<sub>2</sub> T<sub>x</sub> 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<sub>S</sub> of 97.4 Ω sq<sup>-1</sup> . The compact Ti<sub>3</sub> C<sub>2</sub> T<sub>x</sub> 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<sub>S</sub> are negligible even after 22 days of exposure to ambient air. The Ti<sub>3</sub> C<sub>2</sub> T<sub>x</sub> MXene is applied for large-area, 10 × 10 passive matrix flexible OLEDs on substrates measuring 6 × 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.