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    Highly efficient organic solar Cells based on a robust room-temperature solution-processed copper iodide hole transporter

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    1-s2.0-S2211285515003110-main.pdf
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    Description:
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    Type
    Article
    Authors
    Zhao, Kui cc
    Ngongang Ndjawa, Guy Olivier cc
    Jagadamma, Lethy Krishnan cc
    El Labban, Abdulrahman cc
    Hu, Hanlin cc
    Wang, Qingxiao
    Li, Ruipeng
    Abdelsamie, Maged cc
    Beaujuge, Pierre cc
    Amassian, Aram cc
    KAUST Department
    Electron Microscopy
    Imaging and Characterization Core Lab
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Office of the VP
    Organic Electronics and Photovoltaics Group
    Physical Science and Engineering (PSE) Division
    Date
    2015-07-30
    Online Publication Date
    2015-07-30
    Print Publication Date
    2015-09
    Permanent link to this record
    http://hdl.handle.net/10754/561611
    
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    Abstract
    Achieving high performance and reliable organic solar cells hinges on the development of stable and energetically suitable hole transporting buffer layers in tune with the electrode and photoactive materials of the solar cell stack. Here we have identified solution-processed copper(I) iodide (CuI) thin films with low-temperature processing conditions as an effective hole–transporting layer (HTL) for a wide range of polymer:fullerene bulk heterojunction (BHJ) systems. The solar cells using CuI HTL show higher power conversion efficiency (PCE) in standard device structure for polymer blends, up to PCE of 8.8%, as compared with poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS) HTL, for a broad range of polymer:fullerene systems. The CuI layer properties and solar cell device behavior are shown to be remarkably robust and insensitive to a wide range of processing conditions of the HTL, including processing solvent, annealing temperature (room temperature up to 200 °C), and film thickness. CuI is also shown to improve the overall lifetime of solar cells in the standard architecture as compared to PEDOT:PSS. We further demonstrate promising solar cell performance when using CuI as top HTL in an inverted device architecture. The observation of uncommon properties, such as photoconductivity of CuI and templating effects on the BHJ layer formation, are also discussed. This study points to CuI as being a good candidate to replace PEDOT:PSS in solution-processed solar cells thanks to the facile implementation and demonstrated robustness of CuI thin films.
    Citation
    Highly efficient organic solar Cells based on a robust room-temperature solution-processed copper iodide hole transporter 2015 Nano Energy
    Publisher
    Elsevier BV
    Journal
    Nano Energy
    DOI
    10.1016/j.nanoen.2015.07.018
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S2211285515003110
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.nanoen.2015.07.018
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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