Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kinetics
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Título
Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kineticsAutoría
Fecha de publicación
2013Editor
Nature Publishing GroupISSN
2041-1723Cita bibliográfica
MORA-SERO, Ivan, et al. Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kinetics. Nature communications, 2013, 4.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.nature.com/ncomms/2013/130812/ncomms3272/full/ncomms3272.html?WT.ec_i ...Versión
info:eu-repo/semantics/submittedVersionPalabras clave / Materias
Resumen
Colloidal quantum dot solar cells achieve spectrally selective optical absorption in a thin layer of solution-processed, size-effect tuned, nanoparticles. The best devices built to date have relied heavily on drift-based ... [+]
Colloidal quantum dot solar cells achieve spectrally selective optical absorption in a thin layer of solution-processed, size-effect tuned, nanoparticles. The best devices built to date have relied heavily on drift-based transport due to the action of an electric field in a depletion region that extends throughout the thickness of the quantum dot layer. Here we study for the first time the behaviour of the best-performing class of colloidal quantum dot films in the absence of an electric field, by screening using an electrolyte. We find that the action of selective contacts on photovoltage sign and amplitude can be retained, implying that the contacts operate by kinetic preferences of charge transfer for either electrons or holes. We develop a theoretical model to explain these experimental findings. The work is the first to present a switch in the photovoltage in colloidal quantum dot solar cells by purposefully formed selective contacts, opening the way to new strategies in the engineering of colloidal quantum dot solar cells. [-]
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Nature Communications, 2013, 4, Article number: 2272Derechos de acceso
© 2013 Macmillan Publishers Limited. All Rights Reserved.
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