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Effects of Ratio of Electron Donor/Acceptor Moieties on Photophysical, Electronic and Photovoltaic Properties of Donor-π-Acceptor Functionalized Materials

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Three conjugated donor-π-acceptor materials have been synthesized by different ratios of donor-acceptor moieties in molecules, which fabricated with asymmetrical and symmetrical structures. UV-vis absorption data show that increasing of the number of electron-withdrawing moieties in molecule leads to red shift behaviors on the π–π* peaks and the intramolecular charge transfer peaks. Cyclic voltammetry curves show that all compounds present a reversible first oxidation process whose potential change with the number of electron-withdrawing moieties increasing. The single-layer bulk heterojunction solar cells have been fabricated with the materials as donors and PCBM as acceptor. The increasing of the number of electron-withdrawing moieties in the donor materials induces an extension of the photoresponse in the visible spectral region, an increase of the open-circuit voltage and a large enhancement of the external quantum efficiency of devices. Finally, the solvation-induced morphology effects on performances of devices have been investigated by using aromatic and nonaromatic solvents.
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Keywords: DONOR-π-ACCEPTOR; INTRAMOLECULAR CHARGE TRANSFER; SOLVATION-INDUCED MORPHOLOGY

Document Type: Research Article

Publication date: January 1, 2015

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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