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Title

Dye solar cells as optically random photovoltaic media

AuthorsGálvez, Francisco Enrique ; Barnes, Piers R. F.; Halme, Janne; Míguez, Hernán
Issue Date2013
PublisherRoyal Society of Chemistry (UK)
CitationEnergy and Environmental Science (2013)
AbstractIn order to enhance optical absorption, light trapping by multiple scattering is commonly achieved in dye sensitized solar cells by adding particles of a different sort. Herein we propose a theoretical method to find the structural parameters (particle number density and size) that optimize conversion efficiency for electrodes of different thickness containing spherical inclusions of diverse composition. Our work provides a theoretical framework in which the response of solar cells containing diffuse scattering particles can be rationalized. Optical simulations are performed by combining a Monte Carlo approach with Mie theory, in which the angular distribution of scattered light is accounted for. Several types of scattering centers, such as anatase, gold and silver particles, as well as cavities, are considered and their effect compared. Estimates of photovoltaic performance, insight into the physical mechanisms responsible for the observed enhancements, and guidelines to improve the cell design are provided. We discuss the results in terms of light transport in weakly disordered optical media and find that the observed variations between the optimum scattering configurations attained for different electrode thickness can be understood as the result of the randomization of light propagation direction at different depths within the active layer. A primary conclusion of our study is that photovoltaic performance is optimised when the scattering properties of the film are adjusted so that the distance over which incident photons are randomized is comparible to the thickness of the film. This simple relation could also be used as a design rule to attain the optimum optical design in other photovoltaic materials.
Description20 páginas, 5 figuras
Publisher version (URL)http://dx.doi.org/10.1039/C3EE42587H.
URIhttp://hdl.handle.net/10261/88538
DOI10.1039/C3EE42587H.
ISSN1754-5692
Appears in Collections:(ICMS) Artículos
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