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Abstract
A new metal-free organic sensitizer containing a furan moiety as the π-spacer based on the diketo-pyrrolo-pyrrole unit was synthesized through simple synthetic routes and with low cost for the application of dye-sensitized solar cells. Two corresponding dyes with benzene and thiophene spacers were also synthesized for the purpose of comparison. On the basis of optimized DSSC test conditions, the sensitizer containing the furan shows prominent solar energy conversion efficiency ( η) of 5.65% ( J sc = 15.96 mA cm −2, V oc = 541 mV, ff = 0.65) under simulated full sunlight irradiation. The dyes were also tested in a solvent-free ionic liquid electrolyte devices and the stability of devices was performed over 2000 h at full sunlight. The sensitizer containing the furan moiety exhibited good stability and better photovoltaic performance of up to 4.41% power conversion efficiency.
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