KES2-0204
Giant Lamellar Structures in Block Copolymer Self-assembly for High Reflectance Bragg Reflectors
Topic
S2. High-End Characterization/Polymer Physics/Properties
When and Where
Sep 30, 2026
15:25 - 15:50
Room 103
Session Chairs
Sheng LI
Presenter(s)
Du Yeol Ryu (Yonsei University)
Co-Author(s)
Abstract
A simple strategy for developing a distributed Bragg reflector (DBR) is designated with 1D lamella-forming block copolymer (BCP). Using interfacial engineering of symmetric BCP confinement above the glass transition temperatures of the two blocks, lamella-forming polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) was self-assembled into a defect-free multilayer nanostructure oriented parallel to the substrates throughout the film. This caused the lamellar structures to become more asymmetric, enabling the entire visible-wavelength spectrum of DBR films. The reflected wavelength (λm) for the BCP-based DBR films was cooperatively tuned by controlling the crosslinking density in the P2VP domains immediately before the acid incorporation. Using these well-defined giant lamellar structures, we also demonstrate the structural coloration, surface-enhanced Raman scattering, and light-harvesting efficiency for photoelectrochemical cells.
