The use of renewable energy sources, which is becoming increasingly widespread in the world, is increasing. Among these energy sources, solar energy has an important place. Photovoltaic devices are systems that can directly convert solar energy into electrical energy. Electron donor carbazole is widely used in solar cells due to its wide band gap, optical and photoconductive properties. In this study, naphthalene derivative carbazole was synthesized as a monomer to be used in solar cell design. This monomer contains n-octylcarbazole as electron donor and naphthalene as π-spacer group. Naphthalene with high π bond conjugation emits strong fluorescence in the range of 200-400 nm. The synthesized new carbozol-derived monomer structure was analyzed by FT-IR, 1H-NMR, 13C-NMR, CHN methods. To investigate the electrochemical performance of the monomer, the oxidation of the monomer was examined on three different electrode (Au, Pt, Gc). surface in dichloromethane solution containing tetrabutylammonium hexafluoraphosphate using the cyclic voltammetry method. The optimum oxidation performance of the monomer was obtained from voltammograms taken between -0.2 and 1.6 V on the glassy carbon (Gc) electrode surface. The HOMO-LUMO energy levels and UV absorption of the synthesized compound were determined. Eg(el) and Eg(opt) values obtained from CV and UV graph and band gaps were compared.