Salts as Additives: A Route to Improve Performance and Stability of n-Type Organic Electrochemical Transistors

Organic electrochemical transistors (OECTs) are becoming increasingly ubiquitous in various applications at the interface with biological systems. However, their widespread use is hampered by scarcity of electron-conducting (n-type) backbones and poor performance stability existing n-OECTs. Here, we introduce organic salts as a solution additive to improve transduction capability, shelf life, operational We demonstrate that salt-cast devices present 10-fold increase transconductance achieve least one year-long stability, while pristine degrade within four months storage. The salt-added films show improved backbone planarity greater charge delocalization, leading higher electronic carrier mobility. These distinctly porous morphology where interconnectivity affected salt type, responsible for OECT speed. salt-based display limited changes lower water uptake upon doping, possible reason device cycling stability. Our work provides new easy route n-type which can be adapted other operating aqueous electrolyte interface.