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    Enhancement of organic solar cell efficiency by altering the zinc oxide photoanode nanostructure morphology

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    Authors
    Samavati, Zahra
    Samavati, Alireza
    Ismail, Ahmad Fauzi
    Borhani, Tohid N
    Velashjerdi, Mohammad
    Eisaabadi, B Ghasem
    Rostami, Amir
    Othman, Mohd Hafiz Dzarfan
    Awang, Asmahani
    Affiliation
    Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton, WV1 1LY, UK
    Issue Date
    2021-11-10
    
    Metadata
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    Abstract
    The current paper examines the effects of zinc oxide nanostructure configurations, as photo-anode formations of organic solar cells, on the performance of power conversion. To this end, some experiments were conducted during which a near band edge emission red shift of ~ 0.11 eV from nanoparticles to vertically oriented nano-rods was observed. This bandgap narrowing promotes transferring of photo-excited electrons towards the conduction band of photo-anode. A ~ 48% decrease in the deep level emission intensity revealed a smaller non-radiative waves emission due to lower level of crystal disorder. Using vertically oriented zinc oxide nanorods as photo-anodes, the photovoltaic efficiency of the organic solar cell improved considerably. The nano-rod-structured photo-anodes showed a 0.22 V rise in the open-circuit voltage, from 0.76 to 0.98 V, and a 2.08 times increment in the overall conversion performance, compared to the zinc oxide nanoparticle-structured photo-anodes. This superior performance is attributed to a greater chance of charge recombination and light-trapping in the cells, more efficient light absorption, and high level of crystallinity that grants easier electron mobility for vertically oriented zinc oxide nanorods. Moreover, a lower charge-transfer resistance (0.85 Ω) was achieved due to better electro-catalytic action for oxygen reduction for vertical nanorods compared to the other two zinc oxide configurations (1.62 Ω and 4.06 Ω). This boosted the cell performance by increasing the short-circuit current density (JSC). The fabricated solar cell may contribute to sustainable and environmentally friendly electricity generation process through reducing the consumption of non-renewable energy sources.
    Citation
    Samavati, Z., Samavati, A., Ismail, A.F. et al. (2022) Enhancement of organic solar cell efficiency by altering the zinc oxide photoanode nanostructure morphology, Journal of Nanostructure in Chemistry, 12, 1119–1130 (2022). https://doi.org/10.1007/s40097-021-00453-2
    Publisher
    Springer Science and Business Media LLC
    Journal
    Journal of Nanostructure in Chemistry
    URI
    http://hdl.handle.net/2436/624884
    DOI
    10.1007/s40097-021-00453-2
    Additional Links
    https://link.springer.com/article/10.1007/s40097-021-00453-2
    Type
    Journal article
    Language
    en
    Description
    This is an accepted manuscript of an article published by Springer in Journal of Nanostructure in Chemistry on 10/11/2021, available online: https://doi.org/10.1007/s40097-021-00453-2 This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections.
    ISSN
    2008-9244
    EISSN
    2193-8865
    ae974a485f413a2113503eed53cd6c53
    10.1007/s40097-021-00453-2
    Scopus Count
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    Faculty of Science and Engineering

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