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Improving OFF‐State Bias‐Stress Stability in High‐Mobility Conjugated Polymer Transistors with an Anti‐Solvent Treatment

Improving OFF‐State Bias‐Stress Stability in High‐Mobility Conjugated Polymer Transistors with an Anti‐Solvent Treatment

Authors :
Nguyen, Malgorzata
Kraft, Ulrike
Tan, Wen Liang
Dobryden, Illia
Broch, Katharina
Zhang, Weimin
Un, Hio‐Ieng
Simatos, Dimitrios
Venkateshavaran, Deepak
McCulloch, Iain
Claesson, Per M.
McNeill, Christopher R.
Sirringhaus, Henning
Nguyen, Malgorzata
Kraft, Ulrike
Tan, Wen Liang
Dobryden, Illia
Broch, Katharina
Zhang, Weimin
Un, Hio‐Ieng
Simatos, Dimitrios
Venkateshavaran, Deepak
McCulloch, Iain
Claesson, Per M.
McNeill, Christopher R.
Sirringhaus, Henning
Publication Year :
2023

Abstract

Conjugated 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.<br />Validerad;2023;Nivå 2;2023-07-05 (hanlid);Funder: Engineering and Physical Sciences Research Council (EP/R031894/1); EPSRC Centre for Doctoral Training (EP/L015889/1); EPSRC (EP/S030662/1)

Details

Database :
OAIster
Notes :
application/pdf, English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1399553378
Document Type :
Electronic Resource
Full Text :
https://doi.org/10.1002.adma.202205377