| dc.description.abstract | Dye-sensitized solar cells (DSCs) are promising photovoltaic technology. For broadening the applications, increasing the power conversion efficiency (PCE) of devices is important. In 2012, the device co-sensitized with Black dye and Y1 reaching a record-high PCE of 11.4% demonstrated a good approach to improve the PCE. In this research, we design four new co-adsorption organic dyes (coded CAD-1, CAD-3, CAD-5 and CAD-7) based on Y1 to increase the PCE of devices sensitized with CYC-37 (a ruthenium complex we previously developed). Compared with Y1, the absorption maximum (max) of CADs in DMF red-shifts over 34 nm, and the molar absorption coefficient is larger than 31000 M-1 cm-1. The preliminary results of the devices sensitized with CYC-37 and CADs show that CADs exhibiting high light-harvesting capacity can significantly enhance the incident photon-to-current conversion (IPCE) performance in the wavelength range of 370 ~ 560 nm. Compared with the cell based only on CYC-37, the device post-sensitized with CAD-3 for 0.5 hour increases 14.4% of the IPCE efficiency at 470 nm, superior to that of co-sensitizer Y1 (4.7%). Under the illumination of AM 1.5G simulated sunlight, the device post-sensitized with CAD-3 yields the short-circuit current density of 17.63 mA cm-2, higher than that those of CYC-37 based device and Y1 post-treated cell. The new results of this research provide not only the basis for designing efficient co-adsorption dyes, but also the guidelines of optimizing post-sensitization processes. | en_US |