Phase inversion process to prepare quasi‐solid‐state electrolyte for the dye‐sensitized solar cells
ABSTRACT A quasi-solid-state electrolyte for the dye-sensitized solar cells was prepared following the phase inversion process. The microporous polymer electrolyte based on poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) hybrid with different amount of TiO2 nanoparticles were prepared. The surface morphologies, the differential scanning calorimetry, and the ionic conductivity of the microporous polymer electrolyte were tested and analyzed. The results indicated that the microporous polymer electrolyte with TiO2 nanoparticles modification exhibited better ionic conductivity compared with the original P(VDF-HFP) polymer electrolyte. The optimal ionic conductivity of 0.8 mS cm−1 is obtained with the 30 wt % TiO2 nanoparticles modification. When assembled with the 30 wt % TiO2 nanoparticles modified quasi-solid-state electrolyte, the dye-sensitized TiO2 nanocrystalline solar cell exhibited the light to electricity conversion efficiency of 2.465% at light intensity of 42.6 mW cm−2, much better than the performance of original P(VDF-HFP) microporous polymer electrolyte DSSC. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
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ABSTRACT: Solar cells based on dye-sensitized mesoporous films of TiO2 arelow-cost alternatives to conventional solid-state devices. Impressive solar-to-electrical energy conversion efficiencies have been achieved with such films when used in conjunction with liquid electrolytes. Practical advantages may be gained by the replacement of the liquid electrolyte with a solid charge-transport material. Inorganic p-type semiconductors, and organic materials have been tested in this regard, but in all cases the incident monochromatic photon-to-electron conversion efficiency remained low. Here we describe a dye-sensitized heterojunction of TiO2 with the amorphous organic hole-transport material 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9'-spirobifluorene (OMeTAD; refs. 10 and 11). Photoinduced charge-carrier generation at the heterojunction is very efficient. A solar cell based on OMeTAD converts photons to electric current with a high yield of 33%.01/1998;
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ABSTRACT: Dye sensitized solar cells (DSSC) are the result of a combination of several different materials: optically transparent electrodes, nanoparticulated semiconductors, coordination compounds, inorganic salts, solvents and metallic catalysts. Each material performs a specific task toward the overall objective of harvesting solar light and transforming it into electricity. To improve the efficiency and increase the technological perspectives of DSSC, there is a tendency to substitute some of these materials by polymers. Poly(ethylene terephthalate) based electrodes can substitute glass electrodes, improving the flexibility and impact resistance of a DSSC. Liquid electrolytes are volatile and may leak if the cell is not properly sealed. Their replacement by polymeric electrolytes solves both problems with the additional advantage that they act as a binder for the electrodes. More recently, intrinsically conducting polymers have been used as hole conducting materials in DSSC, with promising results. In this review we will discuss these tendencies, highlighting the advantages of using polymers, and discussing the problems faced by researchers working in this area.Coordination Chemistry Reviews. 01/2004;
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ABSTRACT: Preparation and microstructural and electrochemical characterization of (PEO)nLiAl(SO3Cl)4 (n=2–12) polymer electrolytes containing a mixture of plasticisers, i.e. propylene carbonate (PC) and 1,2-dimethoxyethane (DME), is presented. The effect of plasticizer mixture on polymer crystallinity and its electrical conductivity at various temperatures is studied using X-ray powder diffractometer analysis, differential scanning calorimetry, size exclusion chromatography, and Raman and FTIR spectroscopy in combination with impedance spectroscopy. The dependence of the glass transition temperature, crystallinity and conductivity of the (PEO/PC/DME)nLiAl(SO3Cl)4 polymer electrolytes on salt concentration is measured and discussed with reference to the literature on similar systems. Finally, a quantitative analysis using the Vogel–Tamman–Fulcher equation of a typical conductivity/temperature curve for the amorphous polymer electrolytes under consideration is presented.Electrochimica Acta - ELECTROCHIM ACTA. 01/1998; 44(5):863-870.