From Molecular Structures to Functional Nanostructures: We investigate how the chemical structures and intermolecular interactions of polymer semiconductors govern their self-assembly, crystallinity, molecular orientation, charge transport, and mechanical properties. 

By tuning the conjugated backbone, side-chain architecture, molecular weight, and intermolecular interactions, we design semiconductor materials that combine high electronic performance with mechanical compliance. We also examine aggregation in solution and thin-film formation kinetics to establish clear relationships between molecular design, nanoscale structure, and material function. 

Electronics That Bend, Stretch, and Adapt : We develop free-form optoelectronic devices that maintain stable operation under stretching, bending, folding, and other complex mechanical deformations.

By integrating polymer semiconductors, elastomers, flexible electrodes, and functional interlayers, we design device architectures that combine high optoelectronic performance with mechanical durability. In particular, we investigate the relationships among nanoscale morphology, stress distribution, crack formation, charge transport, and device degradation to establish design principles for mechanically robust electronic materials and devices.

Our research includes intrinsically stretchable organic solar cells, organic photodetectors, and wearable optoelectronic devices.

Organic Photocatalysts for Sustainable Chemical Reactions : We study polymer photocatalytic systems that use photogenerated electrons and holes in organic semiconductors to drive chemical reactions.

By controlling the molecular structures and compositions of polymer donors and acceptors, phase-separated structures within nanoparticles, surface exposure, and catalytic interfaces, we improve the generation, separation, transport, and chemical reactivity of photogenerated charges. Our research particularly focuses on solar-driven hydrogen and hydrogen peroxide production, oxygen reduction, and the selective oxidation of organic molecules.

By combining time-resolved spectroscopy with photocatalytic reaction analysis, we identify how photogenerated charges evolve and participate in chemical reactions, enabling the design of efficient and selective photocatalytic systems.