Photovoltaic Performance of Dye-Sensitized Solar Cells Based on Copper-Cobalt Sulfide
The counter electrode has a significant impact on the performance of dye sensitized solar cells.A platinum free,low-cost bina-ry composite counter electrode is developed.Copper cobalt sulfide(Cu-Co-S)counter electrode is successfully prepared on conductive glass by using solvent thermal method.Based on copper sulfide electrode,cobalt element is introduced in the experiment.It can be seen from the SEM and TEM images that the introduction of cobalt element changes the single physical characteristics of pure copper sulfide electrode.At the same time,the electrocatalytic activity of Cu-Co sulfide electrode is tested by electrochemical tests such as Tafel and EIS.The test results show that the introduction of cobalt ions changes the crystal structure of Cu-Co sulfide electrode,and also improves the electrocatalytic performance of the electrode.As seen from the photocurrent density-voltage curve,the photoelectric conversion effi-ciency of dye-sensitized solar cells prepared by copper sulfide electrode and copper-cobalt sulfide electrode respectively increase from 4.6％to 5.2％,while the original efficiency of platinum electrode is 5.3％.The efficiency of copper-cobalt sulfide electrode is very close to that of platinum electrode.It can replace platinum,so the copper-cobalt sulfide electrode is expected to become a better electrode ma-terial for dye-sensitized solar cells.
dye-sensitized solar cellssolvothermalphotoelectric conversion efficiency
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