| 초록 |
In here, amphiphilic block-graft copolymer SBS-g-POEM was synthesized via free radical polymerization which is composed of poly(styrene-b-butadiene-b-styrene) (SBS) backbone and poly(oxyethylene methacrylate) (POEM) side chains. The SBS-g-POEM was dissolved in solvent and mixed with hydrophilic preformed TiO2 (Pre-TiO2) which has preferential interaction with POEM of SBS-g-POEM. For the micro-phase separation property of amphiphilic copolymer, the SBS-g-POEM was self-assembled as well as Pre-TiO2. For understanding the effect of side chain of polymer on TiO2 structure, SBS-g-POEM with different numbers of ethylene oxide repeating units (different Mw as 500, 950) were used to make organized mesoporous TiO2 films (Om-TiO2). The efficiencies of dye-sensitized solar cells with using Om-TiO2 (500, 950) was 5.7% and 5.8% at 100 mW/cm2, respectively, which was much higher than one (4.8%) with commercial TiO2. |
