Vijayakumar, G.
(Department of Chemistry Education, Interdisciplinary Program of Advanced Information and Display Materials, and Center for Plastic Information System, Pusan National University)
,
Lee, Meyoung-Jin
(Department of Chemistry Education, Interdisciplinary Program of Advanced Information and Display Materials, and Center for Plastic Information System, Pusan National University)
,
Song, Myung-Kwan
(Department of Chemistry Education, Interdisciplinary Program of Advanced Information and Display Materials, and Center for Plastic Information System, Pusan National University)
,
Jin, Sung-Ho
(Department of Chemistry Education, Interdisciplinary Program of Advanced Information and Display Materials, and Center for Plastic Information System, Pusan National University)
,
Lee, Jae-Wook
(Department of Chemistry, Dong-A University)
,
Lee, Chan-Woo
(Department of Chemistry, University of Ulsan)
,
Gal, Yeong-Soon
(Polymer Chemistry Lab, Kyungil University)
,
Shim, Hyo-Jin
(Advanced Materials Division, Korea Research Institute of Chemical Technology)
,
Kang, Yong-Ku
(Advanced Materials Division, Korea Research Institute of Chemical Tec)
,
Lee, Gi-Won
,
Kim, Kyung-Kon
,
Park, Nam-Gyu
,
Kim, Suhk-Mann
Liquid crystal (LC; E7 and/or ML-0249)-embedded, poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-co-HFP)-based, polymer electrolytes were prepared for use in dye-sensitized solar cells (DSSCs). The electrolytes contained 1-methyl-3-propylimidazolium iodide (PMII), tetrabutylammonium iodide (TB...
Liquid crystal (LC; E7 and/or ML-0249)-embedded, poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-co-HFP)-based, polymer electrolytes were prepared for use in dye-sensitized solar cells (DSSCs). The electrolytes contained 1-methyl-3-propylimidazolium iodide (PMII), tetrabutylammonium iodide (TBAI), and iodine ($I_2$), which participate in the $I_3^-/I^-$ redox couple. The incorporation of photochemically stable PVdF-co-HFP in the DSSCs created a stable polymer electrolyte that resisted leakage and volatilization. DSSCs, with liquid crystal(LC)-embedded PVdF-co-HFP-based polymer electrolytes between the amphiphilic ruthenium dye N719 absorbed to the nanocrystalline $TiO_2$ photoanode and the Pt counter electrode, were fabricated. These DSSCs displayed enhanced redox couple reduction and reduced charge recombination in comparison to that fabricated from the conventional PVdF-co-HFP-based polymer electrolyte. The behavior of the polymer electrolyte was improved by the addition of optimized amounts of plasticizers, such as ethylene carbonate (EC) and propylene carbonate (PC). The significantly increased short-circuit current density ($J_{sc}$, $14.60\;mA/cm^2$) and open-circuit voltage ($V_{oc}$, 0.68 V) of these DSSCs led to a high power conversion efficiency (PCE) of 6.42% and a fill factor of 0.65 under a standard light intensity of $100\;mW/cm^2$ irradiation of AM 1.5 sunlight. A DSSC fabricated by using E7-embedded PVdF-co-HFP-based polymer electrolyte exhibited a maximum incident photon-to-current conversion efficiency (IPCE) of 50%.
Liquid crystal (LC; E7 and/or ML-0249)-embedded, poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-co-HFP)-based, polymer electrolytes were prepared for use in dye-sensitized solar cells (DSSCs). The electrolytes contained 1-methyl-3-propylimidazolium iodide (PMII), tetrabutylammonium iodide (TBAI), and iodine ($I_2$), which participate in the $I_3^-/I^-$ redox couple. The incorporation of photochemically stable PVdF-co-HFP in the DSSCs created a stable polymer electrolyte that resisted leakage and volatilization. DSSCs, with liquid crystal(LC)-embedded PVdF-co-HFP-based polymer electrolytes between the amphiphilic ruthenium dye N719 absorbed to the nanocrystalline $TiO_2$ photoanode and the Pt counter electrode, were fabricated. These DSSCs displayed enhanced redox couple reduction and reduced charge recombination in comparison to that fabricated from the conventional PVdF-co-HFP-based polymer electrolyte. The behavior of the polymer electrolyte was improved by the addition of optimized amounts of plasticizers, such as ethylene carbonate (EC) and propylene carbonate (PC). The significantly increased short-circuit current density ($J_{sc}$, $14.60\;mA/cm^2$) and open-circuit voltage ($V_{oc}$, 0.68 V) of these DSSCs led to a high power conversion efficiency (PCE) of 6.42% and a fill factor of 0.65 under a standard light intensity of $100\;mW/cm^2$ irradiation of AM 1.5 sunlight. A DSSC fabricated by using E7-embedded PVdF-co-HFP-based polymer electrolyte exhibited a maximum incident photon-to-current conversion efficiency (IPCE) of 50%.
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제안 방법
All fabrication steps and measurements were carried out in an ambient environment without a protective atmosphere. Conductity measurements were perfbmed by injecting electrolyte in between two ITO glass plates with Cu wire connection using Zahner Elekrik Model electrochemical impedance analyzer over a frequency range of 100 mHz to 1 MHz at various temperatures in the range of 25-80 ℃ with an AC amplitude of 10 mV. Each photovoltaic perfonnance value is obtained by making at least three measurements.
After adding the hot electrolyte solution, the holes were sealed with a Surlyn 아leet followed by a thin glass cover by heating. DSSC performances was determined by using a calibrated AM 1.5G solar simulator (Orel 300 W simulator, models 81150) with a light intensity of 100 mW/cm2 adjusted using a standard PV reference cell (2 cm x 2 cm nanocrystalline silicon solar cell, calibrated at NREL, Colorado, USA) and a computer-controlled Keithley 236 source measure unit. The power conversion efficiency (PCE, rj) of a DSSC is given by
대상 데이터
Liquid crystal, E7 was purchased from Merck. N719 dye ([(C4H9)4N]2 [Ru (II)L2- (NCS)2]), (where L=2, 2'-bipyridyl-4, -4'-dicarboxylic acid, ruthenium TBA 535, Solaronix SA), nanocrystalline Ti-nan- oxide HT/SP and platinum (Pt-catalyst T/SP) paste were purchased from Solaronix. FTO conductive glass substrates with a sheet resistance of 8 Q/cm2 were purchased from Hartford Glass, USA, and were used as substrates for the photoanode and counter electrode.
Four different electrolyte solutions were probed (Figure 1). The optimized PVdF-co- HFP-based polymer electrolyte consists of PVdF-co-HFP (0.132 g), TBAI (0.48 M), PMII (0.79 M), I2 (0.23 M), EC (6.8 M), and PC (1.9 M) in acetonitrile (1 mL). To ensure homogeneity, the mixture was stirred continuously at 80 ℃ for 24 h.
이론/모형
Electrode. A FTO glass substrate was washed thoroughly by using a sonicator and then coated with nanocrystalline TiO2 paste (TiO2-nanoxide HT/SP, Solamix) by using the doctor blade method. The thickness of the film was adjusted by using adhesive tape.
성능/효과
The DSSC containing the E7-embedded PVdF-co-HFP-based polymer electrolyte has a maximum IPCE value of 50%, which is near to that of a liquid electrolyte containing DSSC (51%). Overall, the results of this investigation show that the new LC based polymer electrolyte strategy can be used to construct DSSCs that have enhanced photovoltaic performances and long term thennal stabilities. Further studies of this strategy are in progress.
참고문헌 (32)
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M. K. Nazeeruddin, F. D. Angelis, S. Fantacci, A. Selloni, G. Viscardi, P. Liska, S. Ito, B. Takeru, and M. Gratzel, J. Am. Chem. Soc., 127, 16835 (2005)
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