The search for new metal-free dyes for application in dye-sensitized solar cells (DSSCs) has driven the development of increasingly functional and sophisticated molecular structures. In this context, this dissertation investigates the use of fluorene as a conjugated central platform for the synthesis of novel organic photosensitizers, exploring D-A-D and A-D-A molecular architectures. The approach included functionalization at the methylene bridge of fluorene-an underexplored strategy in the literature- as a key position for attaching donor or acceptor units.In this context, five compounds were synthesized via Knoevenagel condensation and Suzuki cross-coupling reactions and characterized The photophysical analysis revealed intense absorption in the UV-A to early visible range, with maxima between 280-430 nm in solution and around 500 nm in the solid state. HOMO and LUMO energy levels were suitably aligned with the conduction band of TiO2 and the regeneration potential of the I-/I3- redox couple, indicating the feasibility of the compounds for DSSC application. Only the dyes containing carboxylic acid groups showed effective anchoring to the TiO2 surface and were used in solar cell assembly. Devices were tested under standard AM 1.5G irradiation showing distinct behaviors depending on the molecular design. Compound (3c), with an A-D-A configuration, two anchoring groups, and a triphenylamine donor unit, exhibited the most favorable photovoltaic parameters, including short-circuit current density (Jsc), open-circuit voltage (Voc), fill factor (FF), and overall power conversion efficiency. The study of structural effects on optical properties and photovoltaic performance emphasizes the role of molecular design in optimizing organic dyes. The results provide insights into alternative dye architectures with promising potential for application in next-generation photovoltaic technologies.