Improving OFF-State Bias-Stress Stability in High-Mobility Conjugated Polymer Transistors with an Anti-Solvent Treatment.
Advanced Materials - 2022 - Nguyen - Improving OFF‐State Bias‐Stress Stability in High‐Mobility Conjugated Polymer.pdf
Embargo End Date:
Tan, Wen Liang
Claesson, Per M
McNeill, Christopher R
KAUST DepartmentKAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Chemical Science Program
Embargo End Date2023-11-14
Permanent link to this recordhttp://hdl.handle.net/10754/685758
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AbstractConjugated polymer field-effect transistors are emerging as an enabling technology for flexible electronics due to their excellent mechanical properties combined with sufficiently high charge carrier mobilities and compatibility with large-area, low-temperature processing. However, their electrical stability remains a concern. ON-state (accumulation mode) bias-stress instabilities in organic semiconductors have been widely studied, and multiple mitigation strategies have been suggested. In contrast, OFF-state (depletion mode) bias-stress instabilities remain poorly understood despite being crucial for many applications in which the transistors are held in their OFF-state for most of the time. Here, we present a simple method of using an anti-solvent treatment to achieve significant improvements in OFF-state bias-stress and environmental stability as well as general device performance for one of the best performing polymers, solution-processable indacenodithiophene-co-benzothiadiazole (IDT-BT). IDT-BT is weakly crystalline, and we attribute the notable improvements to an anti-solvent-induced, increased degree of crystallinity, resulting in a lower probability of electron trapping and the removal of charge traps. Our work highlights the importance of the microstructure in weakly crystalline polymer films and offers a simple processing strategy for achieving the reliability required for applications in flexible electronics.
CitationNguyen, M., Kraft, U., Tan, W. L., Dobryden, I., Broch, K., Zhang, W., Un, H., Simatos, D., Venkateshavaran, D., McCulloch, I., Claesson, P. M., McNeill, C. R., & Sirringhaus, H. (2022). Improving OFF-State Bias-Stress Stability in High-Mobility Conjugated Polymer Transistors with an Anti-Solvent Treatment. Advanced Materials, 2205377. Portico. https://doi.org/10.1002/adma.202205377
SponsorsWe acknowledge funding from the Engineering and Physical Sciences Research Council (EPSRC, EP/R031894/1). D. Simatos acknowledges support from the EPSRC Centre for Doctoral Training (CDT) in Sensor Technologies and Application (EP/L015889/1). H. Un acknowledges funding from EPSRC (EP/S030662/1). M. Nguyen acknowledges PhD studentship support from FlexEnable Ltd.
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