碩士 國立聯合大學 光電工程學系碩士班 104 In this thesis, we use carbon black (CB) as counter electrodes (CEs) to replace the conventional platinum (Pt) electrodes in dye sensitized solar cells (DSSCs), and optimums the fabrication process in further. The thesis is divided into three parts: (1) the optimization of CB CEs with various concentrations, (2) the optimization of CB (3M) by pre-annealing CB powder, (3) the optimization of pre-annealing CB CEs by using non-working area spin coating method. First, in order to investigate the influence of molecular stacking to the electrical properties of CB CEs, we fabricate CB CEs with various concentrations. The optimization device with CB (5M) with proper fabrication conditions shows the device efficiency of 7.55 %, with the strong enhancement of the short-circuit current (Jsc) and the fill factor (FF). Next, we further improve the electrical properties of CB by pre-annealing CB powder under 600 oC to purify CB and increase the catalyst ability of CB molecules. The molecular stackin