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Proceedings Paper

New deep-red-emitting polymers derived from indenoindene and benzothiadiazole for photovoltaic cells
Author(s): Hongsuk Suh; Youngeup Jin; Jihyun Moon; Suhee Song; Sun Hee Kim; Kwanghee Lee
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Paper Abstract

PPV derivatives, polymers with vinylene units, have their tendency to exhibit degradation, after irradiation with white light or operation of the device, resulting in the appearance of a shifted absorption and emission band in the short wavelength regions of the spectra. In order to reduce oxidation of the vinylene group, the vinylene group was cyclized using two 5-membered rings. In this paper, we report the synthesis and properties of new copolymers utilizing poly(5,5,10,10-tetrakis(2-ethylhexyl)-5,10-dihydroindeno[2,1-a]indene-2,7-diyl) (PININE) and benzothiadiazole (BT). PININE copolymers with BT and thiophene units exhibit high PCE for polymer solar cells (PSCs). Under white light illumination (AM 1.5 G, 100 mW/cm2), the cell based on PININEDTBT/PCBM as the active layer has a short circuit current density (Isc) of 5.93 mA/cm2, a fill factor (FF) of 43 %, and PCE of 1.88 %. These copolymers have not only good processability due to indenoindene unit, in which four alkyl groups can be incorporated, but also the strong and uniform absorbance in the whole visible region.

Paper Details

Date Published: 26 August 2008
PDF: 10 pages
Proc. SPIE 7052, Organic Photovoltaics IX, 70521G (26 August 2008); doi: 10.1117/12.799060
Show Author Affiliations
Hongsuk Suh, Pusan National Univ. (Korea, Republic of)
Youngeup Jin, Pusan National Univ. (Korea, Republic of)
Jihyun Moon, Pusan National Univ. (Korea, Republic of)
Suhee Song, Pusan National Univ. (Korea, Republic of)
Sun Hee Kim, Gwangju Institute of Science and Technology (Korea, Republic of)
Kwanghee Lee, Gwangju Institute of Science and Technology (Korea, Republic of)

Published in SPIE Proceedings Vol. 7052:
Organic Photovoltaics IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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