An alternating copolymer of fluorene donor and quinoxaline acceptor versus a terpolymer consisting of fluorene, quinoxaline and benzothiadiazole building units: synthesis and characterization.

Desta Gedefaw, Zaifei Ma, Endale Mulugeta, Yang Zhao, Fengling Zhang, Mats R. Andersson, Wendimagegn Mammo

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Abstract: An alternating polyfluorene copolymer based on fluorene donor and quinoxaline acceptor (P1) and an alternating terpolymer (P2) with fluorene (50 %) donor and quinoxaline (25 %) and benzothiadiazole (25 %) acceptor units were designed and synthesized for use as photoactive materials in solar cells. The presence of benzothiadiazole unit in P2 increased the optical absorption coverage in the range of 350–600 nm, which is an interesting property and a big potential for achieving improved photovoltaic performances with judicious optimization of the devices. Solar cells were fabricated from 1:4 blends of polymers-PCBM[70] using o-dichlorobenzene (o-DCB) as processing solvent, and P1 showed a power conversion efficiency (PCE) of 3.18 %, with a short-circuit current density (JSC) of 7.78 mA/cm2, an open-circuit voltage (VOC) of 0.82 V, and a fill factor (FF) of 50 % while P2 showed an overall PCE of 2.14 % with corresponding JSC of 5.97 mA/cm2, VOC of 0.84 V and FF of 42 %. In general, P2 gave lower JSC and FF presumably due to the fine domain sizes of the polymer–PCBM[70] blend as seen from the atomic force microscopy (AFM) image which might have affected the charge carrier transport. Graphical abstract: Alternating (P1) and ternary (P2) conjugated polymers were designed, synthesized and used for fabrication of photovoltaic devices.[Figure not available: see fulltext.]

    Original languageEnglish
    Pages (from-to)1167-1183
    Number of pages17
    JournalPOLYMER BULLETIN
    Volume73
    Issue number4
    DOIs
    Publication statusPublished - 1 Apr 2016

    Keywords

    • Benzothiadiazole
    • Fluorene
    • Polyfluorenes
    • Quinoxaline
    • Suzuki coupling reaction

    Fingerprint Dive into the research topics of 'An alternating copolymer of fluorene donor and quinoxaline acceptor versus a terpolymer consisting of fluorene, quinoxaline and benzothiadiazole building units: synthesis and characterization.'. Together they form a unique fingerprint.

  • Cite this