Diffusion-Recombination Determines Collected Current and Voltage in Polymer:Fullerene Solar Cells
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Scholar |
Otros documentos de la autoría: Ripollés Sanchis, Teresa; Guerrero, Antonio; Bisquert, Juan; Garcia-Belmonte, Germà
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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http://dx.doi.org/10.1021/jp305941f |
Metadatos
Título
Diffusion-Recombination Determines Collected Current and Voltage in Polymer:Fullerene Solar CellsFecha de publicación
2012Editor
American Chemical SocietyISSN
1932-7447Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://pubs.acs.org/doi/abs/10.1021/jp305941fVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
The basic operating mechanisms of organic bulk-heterojunction cells comprising poly(3-hexylthiophene (P3HT): [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM) blends are examined based on the selection of diverse ... [+]
The basic operating mechanisms of organic bulk-heterojunction cells comprising poly(3-hexylthiophene (P3HT): [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM) blends are examined based on the selection of diverse materials as cathode contact. The use of both highly and poorly efficient cathodes in combination with impedance spectroscopy allows for a clear-cut separation of the physical mechanisms occurring within the active layer bulk from those taking place at the organic blend-contact interface. The system under study uses either Ca or CaO as the efficient and blocking contact, respectively. The impedance analysis demonstrates that charge carriers (electrons) move by diffusion within extended quasi-neutral regions, so that the cell operation is governed by the kinetic competition between charge transport toward the outer contacts and loss by recombination. It is also observed that contacts contribute with an additional, non-negligible, series resistance that accounts for the electron extraction process. The comparison between active layer thickness and the carrier diffusion length allows exclusion of bulk transport losses as a highly detrimental factor for this class of solar cells. [-]
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The Journal of Physical Chemistry C, 116, 32Derechos de acceso
Copyright © 2012 American Chemical Society
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