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    Effects of Self-Assembled Monolayers on Solid-State CdS Quantum Dot Sensitized Solar Cells

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    Type
    Article
    Authors
    Ardalan, Pendar
    Brennan, Thomas P.
    Lee, Han-Bo-Ram
    Bakke, Jonathan R.
    Ding, I-Kang
    McGehee, Michael D.
    Bent, Stacey F.
    Date
    2011-02-07
    Online Publication Date
    2011-02-07
    Print Publication Date
    2011-02-22
    Permanent link to this record
    http://hdl.handle.net/10754/598085
    
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    Abstract
    Quantum dot sensitized solar cells (QDSSCs) are of interest for solar energy conversion because of their tunable band gap and promise of stable, low-cost performance. We have investigated the effects of self-assembled monolayers (SAMs) with phosphonic acid headgroups on the bonding and performance of cadmium sulfide (CdS) solid-state QDSSCs. CdS quantum dots ∼2 to ∼6 nm in diameter were grown on SAM-passivated planar or nanostructured TiO 2 surfaces by successive ionic layer adsorption and reaction (SILAR), and photovoltaic devices were fabricated with spiro-OMeTAD as the solid-state hole conductor. X-ray photoelectron spectroscopy, Auger electron spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, transmission electron microscopy, water contact angle measurements, ellipsometry, and electrical measurements were employed to characterize the materials and the resulting device performance. The data indicate that the nature of the SAM tailgroup does not significantly affect the uptake of CdS quantum dots on TiO2 nor their optical properties, but the presence of the SAM does have a significant effect on the photovoltaic device performance. Interestingly, we observe up to ∼3 times higher power conversion efficiencies in devices with a SAM compared to those without the SAM. © 2011 American Chemical Society.
    Citation
    Ardalan P, Brennan TP, Lee H-B-R, Bakke JR, Ding I-K, et al. (2011) Effects of Self-Assembled Monolayers on Solid-State CdS Quantum Dot Sensitized Solar Cells. ACS Nano 5: 1495–1504. Available: http://dx.doi.org/10.1021/nn103371v.
    Sponsors
    We would like to thank the Stanford Nanocharacterization Laboratory (SNL) staff and the staff of the Center for Polymer Interfaces and Macromolecular Assemblies (CPIMA) for their support. This publication was based on work supported by the Center for Advanced Molecular Photovoltaics (Award No. KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/nn103371v
    PubMed ID
    21299223
    ae974a485f413a2113503eed53cd6c53
    10.1021/nn103371v
    Scopus Count
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