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    High performance conjugated terpolymers as electron donors in nonfullerene organic solar cells

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    Manuscript maintextnSI_revised_KAUSTrepository.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Paleti, Sri Harish Kumar cc
    Gasparini, Nicola cc
    Chochos, Christos L. cc
    Baran, Derya cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Solar Center (KSC)
    KAUST Grant Number
    Award No. OSR-2018-CARF/CCF-3079.
    Date
    2020
    Embargo End Date
    2021-09-18
    Submitted Date
    2020-03-17
    Permanent link to this record
    http://hdl.handle.net/10754/665851
    
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    Abstract
    We demonstrate the synthesis of three π-conjugated terpolymers based on the nonconventional molecular design strategy D1-D2-D1-A comprising two different multi-fused ladder-type arene electron donating moieties [(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl (DTS) as D1 and thienyl-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) derivatives as D2] and an electron withdrawing unit [5,6-difluoro-2,1,3-benzothiadiazole (DFBT) as A]. The implementation of these materials as electron donors is explored in high performance near infrared non-fullerene acceptor (NFA) organic solar cells utilizing the benchmark low bandgap NFA IEICO-4F. The triple bulk heterojunction blend systems provide the basis for a detailed structure-property-performance relationship in terms of BDT's thienyl substitution (alkyl, alkylthio and fluoro) by investigating the correlations between the molecular energy level alignments, performance, and device physics of OSCs. The alkylthienyl-BDT based π-conjugated terpolymer [P(DTS-BDT-DFBT)] exhibits the best photovoltaic performance delivering a power conversion efficiency of 10% with a high short circuit current density of 22.7 mA cm-2. The combination of optoelectronic measurements and morphological analyses revealed the suppression of field dependent charge recombination in P(DTS-BDT-DFBT):IEICO-4F as compared to alkylthiothienyl-BDT [P(DTS-BDTS-DFBT):IEICO-4F] and fluoro-substituted thienyl-BDT [P(DTS-BDTF-DFBT):IEICO-4F] based OSC devices.
    Citation
    Paleti, S. H. K., Gasparini, N., Chochos, C. L., & Baran, D. (2020). High performance conjugated terpolymers as electron donors in nonfullerene organic solar cells. Journal of Materials Chemistry C, 8(38), 13422–13429. doi:10.1039/d0tc01379j
    Sponsors
    We acknowledge the support of King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-CARF/CCF-3079.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Journal of Materials Chemistry C
    DOI
    10.1039/d0tc01379j
    Additional Links
    http://xlink.rsc.org/?DOI=D0TC01379J
    ae974a485f413a2113503eed53cd6c53
    10.1039/d0tc01379j
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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