Abstract
By introducing the narrow band gap unit (dithiophene-benzothiadiazole) to the organic dye system, two novel or- ganic dyes (DD2, DH2) with two-dimensional structures were designed and synthesized. The influence of dithiophene-ben- zothiadiazole unit acting as side chain or bridge group on the photophysical, electrochemical, and photovoltaic properties of the two dye-sensitizers was studied systematically. Two as-synthsized dyes with dithiophene-benzothiadiazole unit exhibited broad absorption spectra. Under one sun illumination (100 mWcm -2 , AM 1.5 G), DH2- and DD2-based dye-sensitized solar cells showed the power conversion efficiencies (PCE) of 1.67% and 3.26%, respectively. With optimization of co-adsorbent chenodeoxycholic acid (CDCA), DH2 exhibited a relatvely good anti-aggregation ability. Therefore, CDCA had a negligible effect on the PCE of DH2-based DSSCs. However, DD2 achieved an enhanced PCE of 5.53% after adding CDCA as
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