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    Deciphering the Role of Fluorination: Morphological Manipulation Prompts Charge Separation and Reduces Carrier Recombination in All-Small-Molecule Photovoltaics

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    Name:
    Tang_et_al-2020-Solar_RRL_accepted MS.pdf
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    Format:
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Tang, Hua
    Yan, Cenqi
    Karuthedath, Safakath cc
    Yin, Hang
    Gao, Yajun
    Gao, Jie
    Zhang, Lerun
    Huang, Jiaming
    So, Shu Kong
    Kan, Zhipeng
    Laquai, Frédéric cc
    Li, Gang cc
    Lu, Shirong
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-01-04
    Online Publication Date
    2020-01-04
    Print Publication Date
    2020-04
    Submitted Date
    2019-11-22
    Permanent link to this record
    http://hdl.handle.net/10754/661403
    
    Metadata
    Show full item record
    Abstract
    Fluorination has proven effective in increasing the absorption, downshifting the energy levels, and enhancing the crystallinity of high-performance fused-ring electron acceptors (FREAs). However, an in-depth understanding of the effects of fluorination is still lacking, as research efforts have mainly focused on increasing the power conversion efficiency (PCE). In addition, fluorination on FREAs has rarely been reported in all-small-molecule organic solar cells (ASM OSCs). Herein, fluorination on FREAs is systematically studied in ASM OSCs using the popular FREA 2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile and its fluorinated analog paired with DRCN5T, an oligothiophene donor seldom investigated in ASM OSCs to date. (Photo)physical studies are conducted on both systems and it is identified that, along with the aforementioned ones, fluorination exerts several additional effects, including the following. First, it optimizes the morphology, thereby accelerating charge separation and reducing geminate recombination charge pairs; second, it suppresses energetic disorder; and third, it prolongs the carrier lifetime and thus aids charge extraction. Consequently, the short-circuit current density and fill factor are significantly enhanced, and in turn, the PCE yields a 36% improvement, climbing to 9.25% and rivaling that of the current state-of-the-art oligothiophene-donor/nonfullerene ASM OSCs. The insights decipher the working mechanism of ASM OSCs that use fluorinated FREAs, paving the way toward high-performance ASM OSCs.
    Citation
    Tang, H., Yan, C., Karuthedath, S., Yin, H., Gao, Y., Gao, J., … Lu, S. (2020). Deciphering the Role of Fluorination: Morphological Manipulation Prompts Charge Separation and Reduces Carrier Recombination in All-Small-Molecule Photovoltaics. Solar RRL, 1900528. doi:10.1002/solr.201900528
    Sponsors
    H.T. and C.Y. contributed equally to this work. H.T. thanks the support from Youth Innovation Fund (Y82A260Q10). Z.K. acknowledges the support from National Natural Science Foundation of China (No. 61805245) and CAS Pioneer Hundred Talents Program (Y82A060Q10, Y92A160Q10). G.L. and C.Y. acknowledge the support from Research Grants Council of Hong Kong (Project Nos 15218517, C5037-18G), Shenzhen Science and Technology Innovation Commission (project no. JCYJ20170413154602102), and funding for Project of Strategic Importance provided by Hong Kong Polytechnic University (project code: 1-ZE29). S.L. acknowledges the support from research grants from the National Youth Thousand Program Project (R52A199Z11), the National Special Funds for Repairing and Purchasing Scientific Institutions (Y72Z090Q10), and the “Artificial Intelligence” Key Project of Chongqing (no. cstc2017rgzn-zdyfX0030). This publication was based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no: OSR-2018-CARF/CCF-3079.
    Publisher
    Wiley
    Journal
    Solar RRL
    DOI
    10.1002/solr.201900528
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.201900528
    ae974a485f413a2113503eed53cd6c53
    10.1002/solr.201900528
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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