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dc.contributor.authorGonzález Pedro, Victoria
dc.contributor.authorSima, Cornelia
dc.contributor.authorMarzari, Gabriela
dc.contributor.authorBoix, Pablo P.
dc.contributor.authorGiménez Juliá, Sixto
dc.contributor.authorQing, Shen
dc.contributor.authorDittrich, Thomas
dc.contributor.authorMora Seró, Iván
dc.description.abstractHere 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.ca_CA
dc.format.extent27 p.ca_CA
dc.publisherRoyal Society of Chemistryca_CA
dc.relation.isPartOfPhys. Chem. Chem. Phys., 2013, Volume 15, Issue 33ca_CA
dc.rightsThis journal is © the Owner Societies 2013ca_CA
dc.subjectQuantum Dotsca_CA
dc.subjectSensitized Solar Cellsca_CA
dc.titleHigh performing PbS Quantum Dot Sensitized Solar Cells exceeding 4% efficiency: The role of metal precursor in the electron injection and charge separationca_CA

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