Therefore, the stability and energy conversion efficiency are two important concerns for utilizing natural dyes as photosensitizers for DSSCs. In this work, the performance and stability of chlorophyll-based natural dyes in TiO2-based DSSCs was studied. The dyes were extracted from papaya leaves and the dye acidity was controlled by adding benzoic acid. The performance and stability of the natural dye-based DSSCs were compared with those of N719-based DSSCs.