Influence of Quantum Dot Concentration on Carrier Transport in ZnO:TiO(2) Nano-Hybrid Photoanodes for Quantum Dot-Sensitized Solar Cells

Zinc oxide nanowire and titanium dioxide nanoparticle (ZnO:TiO(2) NW/NP) hybrid films were utilized as the photoanode layer in quantum dot-sensitized solar cells (QDSSCs). CdSe quantum dots (QDs) with a ZnS passivation layer were deposited on the ZnO:TiO(2) NW/NP layer as a photosensitizer by succes...

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Bibliographic Details
Main Authors: Maloney, Francis S., Poudyal, Uma, Chen, Weimin, Wang, Wenyong
Format: Online Article Text
Language:English
Published: MDPI 2016
Subjects:
Article
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5245735/
https://www.ncbi.nlm.nih.gov/pubmed/28335319
http://dx.doi.org/10.3390/nano6110191
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Summary:Zinc oxide nanowire and titanium dioxide nanoparticle (ZnO:TiO(2) NW/NP) hybrid films were utilized as the photoanode layer in quantum dot-sensitized solar cells (QDSSCs). CdSe quantum dots (QDs) with a ZnS passivation layer were deposited on the ZnO:TiO(2) NW/NP layer as a photosensitizer by successive ion layer adsorption and reaction (SILAR). Cells were fabricated using a solid-state polymer electrolyte and intensity-modulated photovoltage and photocurrent spectroscopy (IMVS/PS) was carried out to study the electron transport properties of the cell. Increasing the SILAR coating number enhanced the total charge collection efficiency of the cell. The electron transport time constant and diffusion length were found to decrease as more QD layers were added.

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