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    Colloidal quantum dot solar cells on curved and flexible substrates

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    Type
    Article
    Authors
    Kramer, Illan J. cc
    Moreno-Bautista, Gabriel
    Minor, James C.
    Kopilovic, Damir
    Sargent, Edward H. cc
    KAUST Grant Number
    KUS-11-009-21
    Date
    2014-10-20
    Permanent link to this record
    http://hdl.handle.net/10754/597797
    
    Metadata
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    Abstract
    © 2014 AIP Publishing LLC. Colloidal quantum dots (CQDs) are semiconductor nanocrystals synthesized with, processed in, and deposited from the solution phase, potentially enabling low-cost, facile manufacture of solar cells. Unfortunately, CQD solar cell reports, until now, have only explored batch-processing methods - such as spin-coating - that offer limited capacity for scaling. Spray-coating could offer a means of producing uniform colloidal quantum dot films that yield high-quality devices. Here, we explore the versatility of the spray-coating method by producing CQD solar cells in a variety of previously unexplored substrate arrangements. The potential transferability of the spray-coating method to a roll-to-roll manufacturing process was tested by spray-coating the CQD active layer onto six substrates mounted on a rapidly rotating drum, yielding devices with an average power conversion efficiency of 6.7%. We further tested the manufacturability of the process by endeavoring to spray onto flexible substrates, only to find that spraying while the substrate was flexed was crucial to achieving champion performance of 7.2% without compromise to open-circuit voltage. Having deposited onto a substrate with one axis of curvature, we then built our CQD solar cells onto a spherical lens substrate having two axes of curvature resulting in a 5% efficient device. These results show that CQDs deposited using our spraying method can be integrated to large-area manufacturing processes and can be used to make solar cells on unconventional shapes.
    Citation
    Kramer IJ, Moreno-Bautista G, Minor JC, Kopilovic D, Sargent EH (2014) Colloidal quantum dot solar cells on curved and flexible substrates. Applied Physics Letters 105: 163902. Available: http://dx.doi.org/10.1063/1.4898635.
    Sponsors
    The authors would like to thank Ikeuchi USA for useful discussions on the appropriate nozzles to use for our materials and solvents. This research was supported in part by IBM Canada Research and Development Center. This publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST).
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4898635
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4898635
    Scopus Count
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    Publications Acknowledging KAUST Support

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