Identification of Differences in Charge Carrier Behavior Mechanisms between Organic Semiconductor-Based Photovoltaic and Photocatalytic Hydrogen Evolution Systems
발표자
함가영 (경북대학교)
연구책임자
손창윤 (Seoul National University)
조새벽 (Sungkyunkwan University (SKKU))
정대성 (Pohang University of Science and Technology (POSTECH))
차효정 (경북대학교)
공동저자
함가영 (경북대학교), 안상혁 (Pohang University of Science and Technology (POSTECH)), 정우택 (Pohang University of Science and Technology (POSTECH)), 권현민 (Sungkyunkwan University (SKKU)), 강성현 (Seoul National University), 이재혁 (Seoul National University), 손창윤 (Seoul National University), 조새벽 (Sungkyunkwan University (SKKU)), 정대성 (Pohang University of Science and Technology (POSTECH)), 차효정 (경북대학교)
초록
내용
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.