Journal ArticleDOI
Current Density versus Potential Characteristics of Dye-Sensitized Nanostructured Semiconductor Photoelectrodes. 2. Simulations
TLDR
In this paper, the impact of changes in various parameters on the steady-state current density−potential (J−E) characteristics of dye-sensitized nanostructured semiconductor photoelectrodes has been evaluated through a series of simulations.Abstract:
The impact of changes in various parameters on the steady-state current density−potential (J−E) characteristics of dye-sensitized nanostructured semiconductor photoelectrodes has been evaluated through a series of simulations. The model parameters can be divided into three classes, designated as type I, type II, and type III, respectively. Type I parameters primarily affect the open-circuit potential without changing the overall shape of the J−E curves. Type II parameters primarily affect the limiting quantum yield for photocurrent production. Rate constants for injection and quenching of the excited state of the dye by the contacting phase are type II parameters, whereas the rate constant for the direct electrolyte reduction reaction, the reduced equilibrium constant for iodine formation, and the rate constant for recombination are type I parameters. The rate constant for regeneration affects both the shape of the J−E curves and the limiting quantum yield for photocurrent flow, and it is therefore designated as a type III parameter. Variation of the diffusion coefficient parameter for electrons in the semiconducting membrane produces a mixed response having both type I and II characteristics. Comparisons between simulations and experimental data have delineated the factors that should be manipulated to increase the energy conversion efficiency of photoelectrochemical cells that utilize nanostructured TiO_2 electrodes.read more
Citations
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Journal ArticleDOI
Electron Transfer Dynamics in Dye-Sensitized Solar Cells
TL;DR: In this article, the materials design parameters that control the processes of charge separation, and thereby device efficiency, in dye-sensitized photoelectrochemical solar cells are discussed.
Journal ArticleDOI
Improvement of efficiency of dye-sensitized solar cells based on analysis of equivalent circuit
TL;DR: In this article, the principle of dye-sensitized solar cells (DSCs) in terms of a new physics-based equivalent circuit model was discussed, and the highest efficiency scores of 10.4% and 10.8% (aperture illumination area 1.004 cm2 and 0.2227 cm2, respectively) were confirmed by a public test center.
Journal ArticleDOI
Charge separation and efficient light energy conversion in sensitized mesoscopic solar cells based on binary ionic liquids.
Peng Wang,Bernard Wenger,Robin Humphry-Baker,Jacques-E. Moser,Joël Teuscher,Willi Prof. Dr. Kantlehner,Jochen Mezger,Edmont V. Stoyanov,Shaik M. Zakeeruddin,Michael Grätzel +9 more
TL;DR: Ultramicroelectrode voltammetric, nanosecond laser transient absorbance, and photovoltaic measurements show that a high iodide concentration is required for dye regeneration to compete efficiently with charge recombination.
Journal ArticleDOI
Electron transport in dye-sensitized solar cells based on ZnO nanotubes: evidence for highly efficient charge collection and exceptionally rapid dynamics.
Alex B. F. Martinson,Márcio Sousa Góes,Márcio Sousa Góes,Francisco Fabregat-Santiago,Juan Bisquert,Michael J. Pellin,Joseph T. Hupp +6 more
TL;DR: Dye-sensitized solar cells based on ordered arrays of polycrystalline ZnO nanotubes, 64 mum in length, are shown to exhibit efficient electron collection over the entire photoanode array length, making these pseudo-1D photoanodes the fastest reported for an operating DSC to date.
Journal ArticleDOI
UV Degradation and Recovery of Perovskite Solar Cells
Sang Won Lee,Seongtak Kim,Soohyun Bae,Kyung-Jin Cho,Taewon Chung,Laura E. Mundt,Seunghun Lee,Seunghun Lee,Sungeun Park,Sungeun Park,Hyomin Park,Martin C. Schubert,Stefan W. Glunz,Stefan W. Glunz,Yohan Ko,Yongseok Jun,Yoonmook Kang,Hae-Seok Lee,Donghwan Kim +18 more
TL;DR: The degradation of perovskite solar cells in the presence of UV light alone was examined, and during exposure to consecutive UV light, the diminished short circuit current density (Jsc) and EQE continuously restored.
References
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Journal ArticleDOI
Conversion of light to electricity by cis-X2bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) charge-transfer sensitizers (X = Cl-, Br-, I-, CN-, and SCN-) on nanocrystalline titanium dioxide electrodes
Mohammad Khaja Nazeeruddin,Andreas Kay,I. Rodicio,Robin Humphry-Baker,E. Mueller,Paul Liska,Nick Vlachopoulos,Michael Graetzel +7 more
TL;DR: Cis-X 2 Bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) complexes were prepared and characterized with respct to their absorption, luminescence, and redox behavior.
Journal ArticleDOI
Subpicosecond interfacial charge separation in dye-sensitized nanocrystalline titanium dioxide films
TL;DR: In this article, the rate of electron injection following optical excitation of the ruthenium dye RuII(2,2,bipyridyl-4,4‘-dicarboxylate)2(NCS)2 was investigated.
Journal ArticleDOI
The Performance and Stability of Ambient Temperature Molten Salts for Solar Cell Applications
Nicholas Papageorgiou,Y. Athanassov,M. Armand,P. Bonho⁁te,H. Pettersson,A. Azam,Michael Grätzel +6 more
TL;DR: In this article, the performance characteristics, the stability and the mass-transfer effects in a photoelectrochemical regenerative device, as the latter is influenced and can even be limited by local concentration and mass-transport of the electroactive redox mediator species in the electrolyte phase.
Journal ArticleDOI
Interfacial Recombination Processes in Dye-Sensitized Solar Cells and Methods To Passivate the Interfaces
TL;DR: In this paper, two methods for passivating the interfaces that decrease the recombination rates by orders of magnitude are introduced. But they do not consider the effect of other redox couples in these cells, such as ferrocene/ferrocenium.
Journal ArticleDOI
Electron injection and recombination in dye sensitized nanocrystalline titanium dioxide films: A comparison of ruthenium bipyridyl and porphyrin sensitizer dyes
TL;DR: In this article, the sensitizing efficiency of different sensitizer dyes adsorbed to nanocrystalline titanium dioxide films has been investigated, and the photophysics of Ru(dcbpy)2(NCS)2 in solution is dominated by ultrafast (1 ns) π* singlet excited states and only weak singlet/triplet mixing.