Application of novel materials and structures for Dye-sensitized solar cells

• Main Authors: Po-Hsi Fei, 費伯希
• Other Authors: Chih-Hung Tsai
• Format: Others
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/75674891235126585800

碩士 === 國立東華大學 === 光電工程學系 === 103 === Dye-sensitized solar cell (DSSCs)have the advantages of simple process, low cost, and high power efficiency. There are three parts in this thesis. First, we added graphene nanosheetsto TiO2 working electrodes for DSSCs, and we used the FE-SEM, Raman Spectroscopy, XRD, and XPS measurements to identify the quality of the working electrodes.Thedevices were investigated using the measurements such as current density-voltage (J-V), electrochemical impedance characteristics (EIS), and incident photon-to-current conversion efficiency (IPCE). We also investigated the charge transport characteristicsof the electrodes such as electron lifetime, electron transit time, and charge collection efficiency. Second, we used cuprous oxide (Cu2O) as counter electrodes for DSSCs, the characteristics of various counter electrodeswere analyzed via FE-SEM, Raman Spectroscopy, XRD, XPS,and cyclic voltammetry (CV).Moreover, the DSSCs fabricated from these counter electrodeswere analyzed in terms of the J-V curve, IPCE, and EIS.As a result, the Cu2O counter electrodes sintered at 600 °C exhibited the optimal electrode properties and DSSC performance, yielding a power conversion efficiency of 3.62%. Finally, CuO and CuO/graphene pasteswere fabricated and coated on the FTO substrates as the counter electrodes for DSSCs. The characteristics of various electrodeswereinvestigated via FE-SEM, Raman Spectroscopy, XRD, XPS, and cyclic voltammetry. The DSSCs fabricated based onthe CuO/graphene counter electrodesexhibited a power conversion efficiency of 3.4%. Keyword：dye-sensitized solar cells, graphene, titanium dioxide, chemical oxidation, cuprous oxide, copper oxide, electrode.