As devices free of encapsulated liquids, dye-sensitized solid-state solar cells (DSSSCs) where the electrolyte is replaced by a solid hole collector are extensively studied. In this paper we present our observation on DSSSCs using copper iodide as a hole collector. The improvement of this DSSSCs have been achieved by employing organic dyes which have higher extinction coefficients than those of ordinary Ru complex dyes. The organic dyes having indoline or coumarine moiety sensitized DSSSC produce overall energy conversion efficiency of 3.6 % or 2.0 % respectively under standard AM 1.5 irradiation (100 mW cm^-2). The indoline dye sensitized DSSSC efficiency is higher than that of the cells of similar configuration sensitized with N3 dye. It has been reported that indoline dyes forms J aggregates that are not susceptible to concentration quenching. In this aspect indoline dyes have several major advantages in use as sensitizers for DSSSCs. The second issue of this paper is the effect of surface treatment of nanocrystalline TiO₂ electrode with some metal oxides or acetates on the performance of DSSSCs. When the nanocrystalline TiO₂ electrode was dipped into magnesium acetate solution before or after the dyeing process, the open-circuit voltage (Voc) of the TiO₂/Dye/CuI DSSSC was improved. The suppression of the charge recombination at the surface of nanocrystalline TiO₂ electrode by thin layer coating of magnesium acetate was suggested. The effect was depending on the kind of dyes. Finally, we could fabricate the most efficient DSSSC using D-149 dye with the efficiency of 4.2%.