| Recently, the material based an organic-inorganic perovskite-structure is suitable to fabricate lowcost and efficiency solar cells, which has many excellent photoelectric properties, such as high charge-carrier mobilities and high charge carrier lifetimes, controllable bandgap and so on. Some papers have fabricated perovskite thin film solar cells through one-step spin-coating process, but it is different to achieve compact perovskite covering the whole substrate. And also, the material of hole transport layer and counter electrode is expensive. Therefore perovskite is difficult to be commercialized.This dissertation prepared lead iodide perovskite by conventional solvent evaporation and grinding calcination method. And explored a optimum one-step spinning coat process by this method we have fabricated compact lead iodide perovskite thin film and hybrid halide perovskite thin film. On this basis, we assembled lowcost planar-junction perovskite solar cells contrasting of perovskite including CH3NH3PbI3 and CH3NH3PbI3-xClx as light-absorbing layer. At last, we assembled the fiber-shaped solar cells through one-step dipping coat.At first, we got compact lead iodide perovskite thin film by one-step spinning coat process through controlling the concentration of precursor solution, rotational speed of spin coater and the temperature of FTO substrate. From the SEM images, we saw that the thin film was arborescent and the thickness of the film is 750 nm, which also showing wonderful optical absorption property measured by UV-vis, showing absorbing rate is above 85 percent. XRD data says that we has achieved pure perovskite structure. Perovskite thin film can be used as light absorbing material because the full coverage and pure structure. Above all, the author assembled a planar-junction solar cell with the structure of ITO/TiO2/CH3NH3PbI3/P3HT/CNTs. The optimized perovskite solar cells obtained a power conversion efficiency (η) of 0.104% under standard illumination (AM 1.5,100 mW·cm-2).After the author successfully achieved full coverage and compact perovskite solar cells which has pure perovskite structure, using this method we prepared hybrid halide perovskite thin film. We controlled that the ratio of the amount of substance of PbCl2 and MAI was 1:2,1:3 and 1:4 in the precursor solution. Then assembled a planar-junction perovskite solar cells with the structure of ITO/TiO2/CH3NH3PbI3-xClx/P3HT/CNTs. When the ratio is 1:3, under standard illumination the optimized perovskite solar cells obtained a power conversion efficiency (η) of 0.528% which is 3.8 times bigger than above-mentioned one.On the basis of the planar-junction, combining with the peroviskite and CNTs film, the author assembled a fiber-shaped solar cell with the structure Ti/TiO2/CH3NH3Pbl3 and CH3NH3PbI3-xClx/P3HT/CNTs through one-step dipping coat process. Structured TiO2 nanotubes arrays were formed by anodizing the Ti wire used as electron transport layer, and its structure was mainly influenced by the different anodizing time. The best TiO2 nanotubes for the solar cell had a length of 3.455 μm and a diameter of 70 nm. Under standard illumination, the optimized lead iodide solar cells had a conversion efficiency(η) of 0.751%. And the optimized hybrid halide perovskite solar cells had a conversion efficiency (η ) of 2.04% under standard illumination. Compared with the planar-junction solar cells, the fiber-shaped solar cells have higher power conversion efficiency. |
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