High performance conjugated terpolymers as electron donors in nonfullerene organic solar cells
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ArticleKAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
KAUST Solar Center (KSC)
KAUST Grant Number
Award No. OSR-2018-CARF/CCF-3079.Date
2020Embargo End Date
2021-09-18Submitted Date
2020-03-17Permanent link to this record
http://hdl.handle.net/10754/665851
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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/d0tc01379jSponsors
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 CAdditional Links
http://xlink.rsc.org/?DOI=D0TC01379Jae974a485f413a2113503eed53cd6c53
10.1039/d0tc01379j