LAUSR

In this work, organic concerted companion (CC) dyes CCOD-1 and CCOD-2 have been constructed by covalently linking two organic dye units with complementary absorption spectra. Both CC dyes exhibit intense absorption from 300 to 650 nm with the band edges extended to 700 nm. These CC dyes have been used to fabricate dye-sensitized solar cells (DSSCs), and the photovoltaic performance has been investigated using different light sources. CCOD-2 possesses bulkier outer shelter than CCOD-1 owing to the longer carbon chains (C12) at the donor moiety, and thus it has stronger anti-aggregation and anti-charge-recombination ability. Under simulated sunlight (AM1.5G), CCOD-2 exhibits enhanced photovoltaic behavior with the V OC , J SC , and the PCE of 759 mV, 19.23 mA·cm -2 , and 10.4%, respectively. Notably, under the illumination of the indoor T5 fluorescent lamp (2500 lux), CCOD-2 affords an enhanced PCE of 28.0% with remarkable V OC and J SC of 692 mV and 0.424 mA·cm -2 , respectively. Notably, the PCE achieved for CCOD-2 outperforms those of the reference sensitizer N719 and our previously reported CC dyes XW61 and XW70-C8 under the same indoor lamp conditions. In summary, the novel organic CC dyes developed in this work have been demonstrated to be promising for fabricating DSSCs to efficiently harvest the energy of indoor lamps.