POS5-0604
Chalcogenophene Substitution Enables Doping-Tolerant Diketopyrrolopyrrole Mixed Ionic-Electronic Conductors for Low-Power Organic Electrochemical Transistors
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
SHINBEE OH (Korea Advanced Institute of Science and Technology)
Co-Author(s)
Abstract
Enhancing the steady-state performance of organic electrochemical transistors (OECTs) requires the simultaneous optimization of molecular architecture and long-range structural ordering in organic mixed ionic–electronic conductors (OMIECs). To systematically elucidate the structure–property relationships governing OECT performance, we synthesize two chalcogenophene-substituted polymers based on diketopyrrolopyrrole (DPP) featuring optimized hybrid alkyl-glycol side chains: PDPP-4EG-T2 and PDPP-4EG-Se2. Especially, the replacement of polymer backbone with chalcogen units (biselenophenes) enhances its quinoid character, promoting resonance effects that facilitate charge delocalization and stabilize the doped state. Furthermore, this structural modification improves backbone planarity and intermolecular interactions, thereby preserving superior crystallinity even upon doping. Consequently, PDPP-4EG-Se2 exhibits a superior hole mobility of 9.8 cm² V⁻¹ s⁻¹ and a μC* of 786 F cm⁻¹ V⁻¹ s⁻¹, with enhanced operational stability in p-type OECTs. By employing PDPP-4EG-Se2 as a unified material for both the channel and electrode components, we fabricate unipolar inverters and integrate them into a ring oscillator circuit, achieving a high voltage gain relative to dynamic power consumption (45.3 V/V nW⁻1) alongside reliable inverter performance (gain = 40.6 V/V). This study underscores the significance of doping-tolerant morphology through sophisticated molecular design, which is essential for maximizing electronic mobility and overall OECT performance.
