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    Geometric light trapping with a V-trap for efficient organic solar cells

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    Type
    Article
    Authors
    Kim, Soo Jin
    Margulis, George Y.
    Rim, Seung-Bum
    Brongersma, Mark L.
    McGehee, Michael D.
    Peumans, Peter
    KAUST Grant Number
    KUS-I1-001-12
    Date
    2013-03-14
    Online Publication Date
    2013-03-14
    Print Publication Date
    2013-05-06
    Permanent link to this record
    http://hdl.handle.net/10754/598409
    
    Metadata
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    Abstract
    The efficiency of today’s most efficient organic solar cells is primarily limited by the ability of the active layer to absorb all the sunlight. While internal quantum efficiencies exceeding 90% are common, the external quantum efficiency rarely exceeds 70%. Light trapping techniques that increase the ability of a given active layer to absorb light are common in inorganic solar cells but have only been applied to organic solar cells with limited success. Here, we analyze the light trapping mechanism for a cell with a V-shape substrate configuration and demonstrate significantly improved photon absorption in an 5.3%-efficient PCDTBT:PC70BM bulk heterojunction polymer solar cell. The measured short circuit current density improves by 29%, in agreement with model predictions, and the power conversion efficiency increases to 7.2%, a 35% improvement over the performance in the absence of a light trap.
    Citation
    Kim SJ, Margulis GY, Rim S-B, Brongersma ML, McGehee MD, et al. (2013) Geometric light trapping with a V-trap for efficient organic solar cells. Optics Express 21: A305. Available: http://dx.doi.org/10.1364/OE.21.00A305.
    Sponsors
    This publication was based on work supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award No KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST). S J. K. and G. M. acknowledges support from the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-I1-001-12) and the Global Climate and Energy Project at Stanford (GCEP). S J. K. gratefully acknowledges support from the Samsung scholarship. S J. K. also thanks Jason Bloking for assistance with the measurements.
    Publisher
    The Optical Society
    Journal
    Optics Express
    DOI
    10.1364/OE.21.00A305
    PubMed ID
    24104418
    ae974a485f413a2113503eed53cd6c53
    10.1364/OE.21.00A305
    Scopus Count
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