The Study of Carbon Black as Counter Electrodes in Dye Sensitized Solar Cells

• Main Authors: CHOU, YU-CHEN, 周郁晨
• Other Authors: LIN, CHI-FENG
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/71734296264018132878

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 stacking of CB also change, result in the increase of surface roughness. The optimization device with 120 minutes pre-annealing CB powder shows the device efficiency of 7.64 % with the reduction of internal resistance and leakage current of the device. Finally, we introduce the non-working area spin coating method to improve the uniformity of CB film after pre-annealing process. The uniformity of CB film is enhanced obviously and thus increases the device efficiency to 7.77 % with 180 minutes pre-annealing CB powder.