Study on photovoltaic properties of dye-sensitized solar cells based on indigo dyes in the presence of an anti-aggregation agent

Nanostructured dye sensitized solar cells (DSSCs) based on indigo dyes exhibit medium to high power conversion efficiency. Such organic dye molecules easily experience aggregation. As aggregation takes place in dye molecules, electron transfer process in dye-sensitized solar cell will be worsen. Therefore, anti-aggregation agents are commonly added to organic solution in DSSCs. Spectrophotometric evaluations of indigo dyes applied on a TiO2 substrate in the presence and absence of an anti aggregation agent were carried out in order to assess changes in the efficacy of dyes. The results show that addition of anti-aggregation agent reduced undesired J aggregates. Finally, dye sensitized solar cells were fabricated to determine the photovoltaic properties as well as the influence of anti-aggregation agents on their performance.