High-efficiency Structural Coloration Enabled by Defect-free Block Copolymer Self-assembly for Solar Cell Distributed Bragg Reflector
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내용
We propose a simple strategy for developing a distributed Bragg reflector (DBR) with high-reflectance based on defect-free 1-D lamellar microdomains in polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP). We induce a crosslinking reaction between the P2VP blocks by dehalogenation of 1,4-dibromobutane that lead nitrogen atoms in P2VP blocks to be ionized. The ionic P2VP networks are swollen in methanesulfonic acid (MSA), in which cross-linking index determines the swelling ratio. Due to the domain spacing of the swollen films comparable to the visible wavelengths, the films with various swelling ratio strongly (> 68 %) reflect the different wavelengths of visible light. Applying these DBR films to the Si solar cells, there are only minor reductions in power conversion efficiency with vivid and intense colors. Our approach for photovoltaics with minimum optical loss can achieve the harmonization between the exterior of zero-energy buildings with the surrounding environment.