Donor-п-acceptor conjugated copolymers for photovoltaic applications : tuning the open-circuit voltage by adjusting the donor/acceptor ratio

Peng, Qiang, Park, Kuyson, Lin, Tong, Durstock, Michael and Dai, Liming 2008, Donor-п-acceptor conjugated copolymers for photovoltaic applications : tuning the open-circuit voltage by adjusting the donor/acceptor ratio, Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical, vol. 112, no. 10, pp. 2801-2808.

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Title Donor-п-acceptor conjugated copolymers for photovoltaic applications : tuning the open-circuit voltage by adjusting the donor/acceptor ratio
Author(s) Peng, Qiang
Park, Kuyson
Lin, Tong
Durstock, Michael
Dai, Liming
Journal name Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical
Volume number 112
Issue number 10
Start page 2801
End page 2808
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2008-02
ISSN 1520-6106
1520-5207
Summary A class of new conjugated copolymers containing a donor (thiophene)−acceptor (2-pyran-4-ylidene-malononitrile) was synthesized via Stille coupling polymerization. The resulting copolymers were characterized by 1H NMR, elemental analysis, GPC, TGA, and DSC. UV−vis spectra indicated that the increase in the content of the thiophene units increased the interaction between the polymer main chains to cause a red-shift in the optical absorbance. Cyclic voltammetry was used to estimate the energy levels of the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO) and the band gap (Eg) of the copolymers. The basic electronic structures of the copolymers were also studied by DFT calculations with the GGA/B3LYP function. Both the experimental and the calculated results indicated an increase in the HOMO energy level with increasing the content of thiophene units, whereas the corresponding change in the LUMO energy level was much smaller. Polymer photovoltaic cells of a bulk heterojunction were fabricated with the structure of ITO/PEDOT/PSS (30 nm)/copolymer−PCBM blend (70 nm)/Ca (8 nm)/Al (140 nm). It was found that the open-circuit voltage (Voc) increased (up to 0.93 V) with a decrease in the content of thiophene units. Although the observed power convention efficiency is still relatively low (up to 0.9%), the corresponding low fill factor (0.29) indicates considerable room for further improvement in the device performance. These results provided a novel concept for developing high Voc photovoltaic cells based on donor-π-acceptor conjugated copolymers by adjusting the donor/acceptor ratio.
Language eng
Field of Research 091209 Polymers and Plastics
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2008
Copyright notice ©2008, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017970

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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