This paper describes the formulation of nanocrystalline TiO 2 paste for dye-sensitized solar cell (DSSC) applications employing a series of TRITON™ X-based surfactants with an octyl phenol ethoxylate (OPE) backbone and various chain ends. Five different functional group-terminated TRITON™ X (or OPE) derivatives, [OPE5-OH], [OPE5-COOH], [OPE5-NH 2 ], [OPE5-Imidazole], and [OPE5-OPO(OH) 2 ], were prepared from OPE of 5 oxyethylene units (n=5). The carboxylic acid-terminated TRITON™ X (i.e. OPE5-COOH) was found to be the dispersant showing the lowest viscosity of [TiO 2 /ethyl cellulose/terpineol] paste.The photoanode film from the TiO 2 paste was built up on a conducting glass plate by a screen printing process followed by sintering heat treatments. Then, the TiO 2 film showed higher particle density in comparison with the control sample film prepared from the corresponding paste with no dispersant. The solar cell fabricated from the prepared TiO 2 film exhibited improved photocurrent characteristics under illumination.