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

Gedefaw, Desta and Ma, Zaifei and Mulugeta, Endale and Zhao, Yang and Zhang, Fengling and Andersson, Mats R. and Mammo, Wendimagegn (2016) An alternating copolymer of fluorene donor and quinoxaline acceptor versus a terpolymer consisting of fluorene, quinoxaline and benzothiadiazole building units: Synthesis and characterization. Polymer Bulletin, 73 (3). pp. 1167-1183. ISSN 0170-0839

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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 (J SC) of 7.78 mA/cm2, an open-circuit voltage (V OC) of 0.82 V, and a fill factor (FF) of 50 % while P2 showed an overall PCE of 2.14 % with corresponding J SC of 5.97 mA/cm2, V OC of 0.84 V and FF of 42 %. In general, P2 gave lower J SC 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.

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Generic Email
Date Deposited: 29 Aug 2018 14:23
Last Modified: 29 Aug 2018 14:23
URI: http://repository.usp.ac.fj/id/eprint/10887
UNSPECIFIED

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