26 August 2008 New deep-red-emitting polymers derived from indenoindene and benzothiadiazole for photovoltaic cells
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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.
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Hongsuk Suh, Youngeup Jin, Jihyun Moon, Suhee Song, Sun Hee Kim, Kwanghee Lee, "New deep-red-emitting polymers derived from indenoindene and benzothiadiazole for photovoltaic cells", Proc. SPIE 7052, Organic Photovoltaics IX, 70521G (26 August 2008); doi: 10.1117/12.799060; https://doi.org/10.1117/12.799060
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