The Polymer Society of Korea

대학원생 구두발표(발표15분)

구두발표

Identification of Differences in Charge Carrier Behavior Mechanisms between Organic Semiconductor-Based Photovoltaic and Photocatalytic Hydrogen Evolution Systems

함가영 (경북대학교)

손창윤 (Department of Chemistry, Seoul National University, Gwanak-Gu, Seoul, 08826 South Korea)

조새벽 (School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419 Republic of Korea)

정대성 (Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea)

차효정 (School of Energy Engineering, Kyungpook National University, Daegu, 41566 Republic of Korea)

Organic semiconductors (OSCs) are important photoactive materials for organic photovoltaics (OPVs) and photocatalytic hydrogen evolution. This study reveals a paradoxical behavior in which OSCs optimized for efficient charge extraction in OPVs show reduced activity as photocatalysts in aqueous colloids. Nanoparticles (NPs) of PM6:Y6 and D18:Y5 were investigated to compare their photophysical properties in photovoltaic and photocatalytic environments. An inverse relationship was observed between thin-film power conversion efficiency and hydrogen evolution activity. Y5-based NPs exhibited stronger aggregation, longer exciton lifetimes, and slower hole transfer, indicating charge localization that favors interfacial redox reactions. D18 also showed higher photoluminescence quantum yield and reduced non-radiative recombination compared to PM6. These results identify long-lived localized carriers as a key factor governing OSC charge dynamics.

-