High performing PbS Quantum Dot Sensitized Solar Cells exceeding 4% efficiency: The role of metal precursor in the electron injection and charge separation
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Other documents of the author: González Pedro, Victoria; Sima, Cornelia; Marzari, Gabriela; Boix, Pablo P; Gimenez, Sixto; Qing, Shen; Dittrich, Thomas; Mora-Sero, Ivan
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
High performing PbS Quantum Dot Sensitized Solar Cells exceeding 4% efficiency: The role of metal precursor in the electron injection and charge separationAuthor (s)
Date
2013Publisher
Royal Society of ChemistryISSN
1463-9076; 1463-9084Type
info:eu-repo/semantics/articlePublisher version
http://pubs.rsc.org/en/content/articlepdf/2013/cp/c3cp51651bVersion
info:eu-repo/semantics/submittedVersionSubject
Abstract
Here we report the preparation of high performance Quantum Dot Sensitized Solar Cells (QDSCs) based on
PbS–CdS co-sensitized nanoporous TiO2 electrodes. QDs were directly grown on the TiO2 mesostructure by
the ... [+]
Here we report the preparation of high performance Quantum Dot Sensitized Solar Cells (QDSCs) based on
PbS–CdS co-sensitized nanoporous TiO2 electrodes. QDs were directly grown on the TiO2 mesostructure by
the Successive Ionic Layer Absorption and Reaction (SILAR) technique. This method is characterized by a
fast deposition rate which involves random crystal growth and poor control of the defect states and
lattice mismatch in the QDs limiting the quality of the electrodes for photovoltaic applications. In this
work we demonstrate that the nature of the metallic precursor selected for SILAR has an active role in
both the QD’s deposition rate and the defect’s distribution in the material, with important
consequences for the final photovoltaic performance of the device. For this purpose, acetate and
nitrate salts were selected as metallic precursors for the SILAR deposition and films with similar
absorption properties and consequently with similar density of photogenerated carriers were studied.
Under these conditions, ultrafast carrier dynamics and surface photovoltage spectroscopy reveal that
the use of acetate precursors leads to higher injection efficiency and lower internal recombination due
to contribution from defect states. This was corroborated in a complete cell configuration with films
sensitized with acetate precursors, achieving unprecedented photocurrents of B22 mA cm2 and high
power conversion efficiency exceeding 4%, under full 1 sun illumination. [-]
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Phys. Chem. Chem. Phys., 2013, Volume 15, Issue 33Rights
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