| 초록 |
The combined process of graft/crosslink polymerization and sol–gel process has been applied into 100nm-sized TiO2 nanoparticles with an anatase/rutile mixed phase.To be specific, the surface of TiO2 nanoparticles were modified first by grafted hydroxyethyl methacrylate (HEMA) and sulfosuccinic acid (SA) and further polymerization was followed to make poly(hydroxyethyl methacrylate) (PHEMA). In the next sol–gel process, the TiO2 precursor, titanium(IV) isopropoxide (TTIP) was coordinated with PHEMA polymer domain and generated 3-dimensionally interconnected TiO2 films with hierarchical pores. In particular,four different TiO2 photoelectrodes(labeled such aspristine TiO2, TiO2/TTIP, TiO2-HEMA/TTIP and TiO2-PHEMA/TTIP) were prepared for dye sensitized solar cells(DSSC). The energy conversion efficiency of a polymer electrolyte (PEGDME/SiO2/MPII/I2)DSSC fabricated with TiO2-PHEMA/TTIP photoelectrode reached 3.5% at 100 mW cm−2, which was much higher than those of pristine TiO2 (1.4%), TiO2/TTIP (1.6%) and TiO2-HEMA/TTIP (2.0%) photoelectrodes. |
