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    Single-step colloidal quantum dot films for infrared solar harvesting

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    Type
    Article
    Authors
    Kiani, Amirreza
    Sutherland, Brandon R.
    Kim, Younghoon cc
    Ouellette, Olivier cc
    Levina, Larissa
    Walters, Grant
    Dinh, Cao Thang
    Liu, Mengxia
    Voznyy, Oleksandr cc
    Lan, Xinzheng
    Labelle, Andre J.
    Ip, Alexander H.
    Proppe, Andrew H. cc
    Ahmed, Ghada H. cc
    Mohammed, Omar F. cc
    Hoogland, Sjoerd
    Sargent, Edward H. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
    Date
    2016-11-01
    Online Publication Date
    2016-11-01
    Print Publication Date
    2016-10-31
    Permanent link to this record
    http://hdl.handle.net/10754/621843
    
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    Abstract
    Semiconductors with bandgaps in the near- to mid-infrared can harvest solar light that is otherwise wasted by conventional single-junction solar cell architectures. In particular, colloidal quantum dots (CQDs) are promising materials since they are cost-effective, processed from solution, and have a bandgap that can be tuned into the infrared (IR) via the quantum size effect. These characteristics enable them to harvest the infrared portion of the solar spectrum to which silicon is transparent. To date, IR CQD solar cells have been made using a wasteful and complex sequential layer-by-layer process. Here, we demonstrate ∼1 eV bandgap solar-harvesting CQD films deposited in a single step. By engineering a fast-drying solvent mixture for metal iodide-capped CQDs, we deposited active layers greater than 200 nm in thickness having a mean roughness less than 1 nm. We integrated these films into infrared solar cells that are stable in air and exhibit power conversion efficiencies of 3.5% under illumination by the full solar spectrum, and 0.4% through a simulated silicon solar cell filter.
    Citation
    Kiani A, Sutherland BR, Kim Y, Ouellette O, Levina L, et al. (2016) Single-step colloidal quantum dot films for infrared solar harvesting. Applied Physics Letters 109: 183105. Available: http://dx.doi.org/10.1063/1.4966217.
    Sponsors
    This publication is based in part on the work supported by the Ontario Research Fund-Research Excellence Program, ORF #07-042.
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4966217
    Additional Links
    http://dx.doi.org/10.1063/1.4966217
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4966217
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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