1：Experimental Design and Method Selection:

The study involved testing three different natural pigments as single sensitizers and subsequently combined as co-sensitizers in dye sensitized Titania solar cells. The absorption characteristics of the pigments and the photoelectrochemical parameters were studied to determine the photoconversion efficiency of the cells. The interfacial charge transport processes were determined by electrochemical impedance spectroscopy (EIS).

2：Sample Selection and Data Sources:

Natural pigments were obtained from cochineal, papaya peel, and the microalga Scenedesmus obliquus. The UV-Vis absorption spectra of the pigment solutions were measured on an Agilent Technologies spectrophotometer (Cary 5000).

3：0). List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Agilent Technologies spectrophotometer (Cary 5000), JEOL JSM-7800F scanning electron microscope (SEM), Oriel Sol 3A solar simulator, Reference 600 potentiostat (Gamry), Newport 74125 monochromator.

4：Experimental Procedures and Operational Workflow:

The photoelectrode was prepared with a layer of mesoporous semiconductor nanoparticles with a wide band gap, light-harvester molecules that act as a sensitizer, a redox electrolyte and a counter electrode usually coated with platinum. Sensitization of the photoelectrodes was held using the pipetting technique.

5：Data Analysis Methods:

The photoelectric conversion efficiency (PCE) was determined from J-V curves. Electrochemical impedance spectroscopy (EIS) measurements were performed to analyze the internal transport and recombination processes in the cell.