POS2-0645
Time-Aligned Operando GIWAXS on Organic Mixed Ionic Electronic Conductors for Probing Transient Structural Evolution
Topic
S2. High-End Characterization/Polymer Physics/Properties
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Taewoong Yoon (Sungkyunkwan University)
Co-Author(s)
Abstract
The operando grazing-incidence wide-angle X-ray scattering (GIWAXS) has emerged as a powerful tool to probe dynamic structural transformations during electrochemical doping of organic mixed ionic-electronic conductors (OMIECs). However, its temporal resolution remains fundamentally mismatched with the rapid ion dynamics in OMIECs, often obscuring transient microstructural states.
In this presentation, we introduce a time-aligned operando GIWAXS methodology that bridges this gap by extending the electrochemical doping time constant through engineered device geometry. This enables real-time tracking of structural evolution under abrupt doping conditions. Using poly(2-(3,3′-bis(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-[2,2′-bithiophen]-5yl)thieno[3,2-b]thiophene) polymers of distinct molecular weights, we reveal that the microstructural response under abrupt biasing diverges significantly from that observed under conventional voltage-sweeping conditions. Notably, abrupt doping induces intercalation pathways and reorientation behaviors not captured in quasi-equilibrium measurements. Also, the molecular-weight-dependent differences in structural evolution are further corroborated by spectroelectrochemical analysis.
Our approach provides direct insight into doping-pathway-dependent structural dynamics and offers a generalizable yet robust strategy for resolving rapid ion–polymer interactions in functional OMIEC systems. These findings highlight the importance of kinetic control in operando measurements and inform the rational design of mixed-conducting polymer devices for transient or pulse-driven applications
In this presentation, we introduce a time-aligned operando GIWAXS methodology that bridges this gap by extending the electrochemical doping time constant through engineered device geometry. This enables real-time tracking of structural evolution under abrupt doping conditions. Using poly(2-(3,3′-bis(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-[2,2′-bithiophen]-5yl)thieno[3,2-b]thiophene) polymers of distinct molecular weights, we reveal that the microstructural response under abrupt biasing diverges significantly from that observed under conventional voltage-sweeping conditions. Notably, abrupt doping induces intercalation pathways and reorientation behaviors not captured in quasi-equilibrium measurements. Also, the molecular-weight-dependent differences in structural evolution are further corroborated by spectroelectrochemical analysis.
Our approach provides direct insight into doping-pathway-dependent structural dynamics and offers a generalizable yet robust strategy for resolving rapid ion–polymer interactions in functional OMIEC systems. These findings highlight the importance of kinetic control in operando measurements and inform the rational design of mixed-conducting polymer devices for transient or pulse-driven applications
