Abstract
Herein, we report dye-sensitized solar cells (DSSCs) made of dye stained TiO2 semiconductor photoanode fabricated using a quick and novel electrosorption assisted dye-staining process. Electrosorption, through the application of electrochemical potential, can manipulate the interaction of target compounds (in this case “dye”) with an electrode surface. To demonstrate the importance of the electrosorption assisted dye-staining process, two commercially available metal-based dyes (N719 and Z907) and two metal-free dyes (D2d = (Z)-2-cyano-3-(4-((E)-2-(6-(4-methoxyphenyl)-9-octyl-9H-carbazol-3-yl)vinyl)phenyl)acrylic acid and T-SB-C = (E)-2-cyano-3-(4-((E)-4-(diphenylamino)styryl)phenyl)acrylic acid) having carboxylic acid type anchoring group were chosen. By this process, the dye loading realized on the photoanodes was more than that of the conventional soaking process. In case of N719 dye, dye loading was enhanced about 100% from 0.58 x10−7 to 1.21 x10−7 mol cm−2, and power conversion efficiency (PCE) by 35%. The electrosorption assisted dye-staining process discussed in this study requires only an hour to fabricate photoanode versus 12–48 h required for the conventional soaking process.
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