Poly(N-vinyl caprolactam) (PNVCL) side chains were grafted to a poly(vinyl chloride) (PVC) backbone via atom transfer radical polymerization. The synthesized PVC-g-PNVCL graft copolymer was templated for the preparation of porous TiO 2 thin films, which involved a sol-gel reaction and calcination process. The interaction of the carbonyl groups in the PVC-g-PNVCL with the titania was revealed by FT-IR spectroscopy. X-ray diffraction and transmission electron microscopy analysis showed the formation of porous TiO 2 thin films with the anatase phase. A series of porous TiO 2 thin films with different pore sizes and porosities was prepared by varying the solution compositions and were used as photoelectrodes in dye-sensitized solar cells (DSSC) with a polymer electrolyte. The DSSC performed best when using the TiO 2 film with higher porosity, lower interfacial resistance, and longer electron life time. The highest energy conversion efficiency, photovoltage (V oc), photocurrent density (J sc), and fill factor (FF) were 1. 2%, 0. 68 V, 3. 2 mA/cm 2, and 0. 57 at 100 mW/cm 2, respectively, for the quasi-solid state DSSC with a 730-nm-thick TiO 2 film.
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Acknowledgements This work was supported by a National Research Foundation (NRF) grant funded by the Korean government (MEST) through the Pioneer Research Center Program (2008–05103), the Ministry of Knowledge Economy (MKE) through the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (20104010100500), and the MKE and Korea Institute for Advancement in Technology (KIAT) through the Workforce Development Program in Strategic Technology.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)
- Physics and Astronomy(all)