Manufacture And Study On Perovskite-type Dye And Dyesensitized Solar Cells With Mesh Photoanode

Dye-sensitized solar cells(DSSCs), which has the advantages of simple preparation procedure, low cost, environment friendly, and relatively high photoelectric conversion efficiency, has become a research focus on the new energy field, recently. Dye-sensitizer and photoanode are key points in DSSCs. Fabrication and characterization of perovskite-type dye and DSSCs with Ti mesh photoanode are studied in this thesis. The main contents and results in this research are as follows:CH3NH3Pb I3 & CH3NH3 Pb I3-xClx precursor solutions were prepared and thick films of CH3NH3 Pb I3 & CH3NH3 Pb I3-xClx were obtained from the precursor solutions. The crystalline structures, morphologies, crystallization processes of as-prepared CH3NH3 Pb I3 and CH3NH3 Pb I3-xClx were characterized. Photoluminescence property of CH3NH3 Pb I3-xClx thick film was measured. The results show as-prepared CH3NH3 Pb I3 film with tetragonal structure and CH3NH3 Pb I3-xClx(x=1.08) film with cubic structure at room temperature; CH3NH3 Pb I3 crystals can be formed from CH3NH3 Pb I3 precursor solution at temperature range of 30~170 ℃ with γ-butyrolactone evaporation and the exothermic peaks at 52 ℃ and 136 ℃ on differential thermal analyzer(DTA)curve of CH3NH3 Pb I3 precursor solution are associated to the formation of tetragonal and cubic CH3NH3 Pb I3, respectively; CH3NH3 Pb I3-xClx crystals can be formed from CH3NH3 Pb I3-xClx precursor solution at temperature range of 30~135 ℃ with evaporation N,N-dimethyl-formamide; The formation rate of CH3NH3 Pb I3-xClx crystals is slower than that of CH3NH3 Pb I3 crystals. Diffusions of I and Cl species in solution can affect x values and morphologies of CH3NH3 Pb I3-xClx crystals.Ti O2 nanotube arrays were fabricated in electrolyte contained 0.25wt% NH4 F, 2.5vol% water and the ethylene glycol at on Ti mesh and Ti sheet by anodization. The effects of anodized voltage, electrolyte stirring manners and ultrasonic stirring Cr2O3 micrometer particles in solution on the morphologies of Ti O2 nanotube arrays are studied. The change of the crystalline structures for Ti O2 nanotube arrays during annealing was identified. The results show, under ultrasound stirring electrolyte, the increase in the diameter of Ti O2 nanotube with anodized voltages from 30 V to 60V; The lengths of Ti O2 nanotube arrays are 3.5?m, 5.6?m, 8.1?m, and 4.2?m respectively when anodized voltages increase from 30 V to 60V; Ti O2 nanotube arrays obtained at anodized voltage of 50 V are highly ordered while those obtained at 30 V, 40 V and 60 V show a no-tubular structure on Ti O2 nanotube arrays. No-tubular structure occurs always on Ti O2 nanotube arrays after the anodization under magnetic stirring electrolyte. No-tubular structure can be removed by ultrasonic stirring anodized specimens in ethanol solution with Cr2O3 micrometer particles for 5 min. The phases of Ti O2 nanotube change from amorphous to anatase after annealing at 450℃ for 3 hours. Highly ordered Ti O2 nanotube arrays with anatase structure is of benefit to the photoanode application for DSSCs.DSSCs with the anodized Ti sheet or mesh as photoanode and the different overlays on mesh photoanode were fabricated and the properties of the DSSCs were studied. The results show, compared with no-tubular structure on Ti O2 nanotube arrays, the highly ordered nanotube arrays are of benefit to filling dye, resulting in improvement of photoelectric conversion efficiency of DSSCs; The photoelectric conversion efficiency of the DSSCs with Ti mesh as photoanode is 7.4 times higher than that with Ti sheet as photoanode. The photoelectric conversion efficiencies of the DSSCs with a Surlyn1702 film, glass and FTO glass as cover layers reduce 5%, 12% and 35%, respectively. Fill factors of mesh photoanode DSSCs with hard cover layers(glass and FTO glass) are higher than that with soft cover layers(Surlyn1702)。...