Design and modification of three-component randomly incorporated copolymers for high performance organic photovoltaic applications

Li, Jun, Ong, Kok-Haw, Sonar, Prashant, Lim, Siew-Lay, Ng, Ging-Meng, Wong, Hoi-Ka, Tan, Huei-Shuan, & Chen, Zhi-Kuan (2013) Design and modification of three-component randomly incorporated copolymers for high performance organic photovoltaic applications. Polymer Chemistry, 4(3), pp. 804-811.

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Abstract

In this study we report the molecular design, synthesis, characterization, and photovoltaic properties of a series of diketopyrrolopyrrole (DPP) and dithienothiophene (DTT) based donor-acceptor random copolymers. The six random copolymers are obtained via Stille coupling polymerization using various concentration ratios of donor to acceptor in the conjugated backbone. Bis(trimethylstannyl)thiophene was used as the bridge block to link randomly with the two comonomers 5-(bromothien-2-yl)-2,5-dialkylpyrrolo[3,4-c]pyrrole-1, 4-dione and 2,6-dibromo-3,5-dipentadecyl-dithieno[3,2-b;2′,3′-d] thiophene. The optical properties of these copolymers clearly reveal a change in the absorption band through optimization of the donor-acceptor ratio in the backbone. Additionally, the solution processability of the copolymers is modified through the attachment of different bulky alkyl chains to the lactam N-atoms of the DPP moiety. Applications of the polymers as light-harvesting and electron-donating materials in solar cells, in conjunction with PCBM as acceptor, show power conversion efficiencies (PCEs) of up to 5.02%.

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ID Code: 75222
Item Type: Journal Article
Refereed: Yes
Keywords: Alkyl chain, Comonomers, Concentration ratio, Conjugated backbones, Diketopyrrolopyrroles, Dithienothiophene, Donor-acceptors, Electron-donating, Light-harvesting, Molecular design, Organic photovoltaics, Photovoltaic property, Power conversion efficiencies, Processability, Random copolymer, Stille coupling, Three-component, Conversion efficiency, Optical properties, Thiophene, Copolymers
DOI: 10.1039/c2py20763j
ISSN: 1759-9954
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 The Royal Society of Chemistry
Deposited On: 09 Oct 2014 00:09
Last Modified: 12 Oct 2014 05:43

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