Phenomenological modeling of dye-sensitized solar cells under transient conditions

Andrade, Luísa; Sousa, José M.; Ribeiro, Helena Aguilar; Mendes, Adélio

doi:10.1016/j.solener.2011.01.014

Cited by 56 publications

(44 citation statements)

References 29 publications

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“…The model used in this work is based on the initially proposed model by Andrade et al 24 but taking into account the recombination reaction order parameter β. The mobile species considered in the present model are electrons in the conduction band of TiO 2 and iodide and triiodide ions in the liquid electrolyte.…”

Section: Modelingmentioning

confidence: 99%

“…Equation (34) should be inserted in counter electrode overpotential equation (33) and then introduced in the Butler-Volmer equation (24).…”

Section: Iodide and Triiodide Balancementioning

confidence: 99%

“…Because the electrolyte is present throughout all the porous structure of the semiconductor, the recombination reaction is affected by the photoelectrode thickness, iodide concentration, dye structure and others. [6][7][8][9] The average electron diffusion coefficients in anatase TiO 2 ranges between 10 -4 to 10 In this work a dynamic phenomenological model proposed initially by Andrade et al 24 is used to describe the quantitatively effect that transport and recombination have in the performance of the solar cell, and the influence that this has in its design. The model is used to predict the influence of the recombination reaction rate constants (k r ) and diffusion coefficients (D eff ) in the V oc and J sc , considering linear or non-linear recombination reaction.…”

Section: Introductionmentioning

confidence: 99%

“…The electron transport in the photoelectrode was assumed to be governed by diffusion (negligible convection) 18 . From the previous assumptions, the continuity and transport equation that describe the mobile species is 24 :…”

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confidence: 99%

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Modeling, simulation and design of dye sensitized solar cells

2014

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It is well known that recombination and transport rule the performance of dye sensitized solar cells (DSC's); although, the influence that these two phenomena have in their performance, particularly in the open circuit-potential (V oc ) and in the short circuit current (J sc ), is not fully understood. In this paper a phenomenological model is used to describe the quantitatively effect that transport and recombination have in the performance of the solar cell and their influence in its optimal design. The model is used to predict the influence of the recombination reaction rate constant (k r ) and diffusion coefficient (D eff ) in the V oc and in the J sc , whether a linear or non-linear recombination kinetic is considered. It is provided a methodology for decoupling the conduction band shifts from recombination effect in charge extraction experiments. Results also suggest that the influence of recombination in the V oc and in J sc is highly dependent on the reaction order considered. This fact highlights the importance of considering the reaction order when modeling data obtained by experimental methods. The combined results are analyzed and discussed in terms of the collection efficiency and in the optimization of the photoelectrode thickness. The model provides also a useful framework for exploring new concepts and designs for improving DSCs performance.

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Section: Modelingmentioning

confidence: 99%

“…Equation (34) should be inserted in counter electrode overpotential equation (33) and then introduced in the Butler-Volmer equation (24).…”

Section: Iodide and Triiodide Balancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Modeling, simulation and design of dye sensitized solar cells

2014

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“…The continuity and transport governing equations are defined for the mobile species involved: the electrons in the TiO 2 conduction band and the I − /I − 3 ions in the electrolyte. 90 They also provide a brief description of the physics of semiconductors and the main characteristics of a metal -semiconductor contact, semiconductor -electrolyte junction, and electrolyte -platinized TCO contact.…”

Section: Phenomenological Modelingmentioning

confidence: 99%

Dye–Sensitized Solar Cells: An Overview

Andrade¹,

Ribeiro²,

Mendes³

2005

Encyclopedia of Inorganic Chemistry

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Today, a particular interest in the development of alternative energy sources arises, especially motivated by the need of decreasing the dependency on fossil‐fuel resources, and also for the prospect of reducing CO 2 emissions. An attractive strategy to overcome the present energy problem is using renewable energy sources, such as the solar radiation, for producing clean energy. This article describes the main features of dye‐sensitized solar cells (DSCs), explaining their structure and working principles, and highlighting the characteristics of the main materials for high‐performance DSCs. After this brief discussion, the fundamentals behind electrochemical impedance spectroscopy (EIS) are described in order to allow the interpretation of the charge‐transfer kinetics of the different phenomena occurring in a DSC under operation. A phenomenological model addressing the major charge‐transfer mechanisms and energy losses is presented for a better understanding of the factors that limit the performance of DSCs. While a steady‐state approach allows the construction of the current‐voltage characteristics of the cell, the transient approach model is an invaluable tool to relate the phenomenological behavior with certain dynamic techniques, such as EIS.

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