| With the rapidly development of world economy and rapidly growth of population, it makes the demand for various resources increase day by day. But the stone energy as the coal, petroleum, natural gas increasingly dried up. It becomes the main reason of block the global economic development. The solar energy has widely distributed, clean and its renewable received widespread attention around the world. It is considered to be the most promising future energy source for the mankind. The solar cells based mainly on the principle of photovoltaic effect can convert the sun's rays directly into electricity. Accordingly, the fabrication of high-performance and low-cost solar cells is the technological base of the wide utilization of the solar energy.The emergence of organic-inorganic halide perovskite solar cells has attracted great attention over the past few years. The perovskite solar cells have emerged as one of the most of promising candidates for the next generation of solar cells because of its high efficiency, low cost, and easy fabrication. The light absorbing semiconductor material had a perovskite polycrystalline structure, CH3NHsPbX3, where X is a halide atom (I, Cl, Br, or a combination of some of them). The power conversion efficiency (PCE) of perovskite solar cells has been improved from 3.8%to 21.02%. Such a rapid increase in efficiency is attributed to a relatively low band gap, a high absorption coefficient, long charge carrier diffusion lengths, and an apparent tolerance of defects.In this thesis the heterojunction perovskite solar cells based on light absorbing semiconductor material CH3NH3PbI3-xClx and the meso-structured perovskite solar cells based on light absorbing semiconductor material CH3NH3PbI3 had been optimized. The two kinds of perovskite solar cells have different optimal the thickness of the compact layer by spray pyrolysis. In the preparation of the absorption layer CH3NH3PbI3-xClx, we research on the influence of device performance annealing-treatment on the morphology of perovskite films. We found that the optimal of annealing-treatment at 100? in procedural annealing. The PCE of the heteroj unction perovskite solar cells achieved 13.42%. In the preparation of the absorption layer CH3NH3PbI3, we determine the optimal of the speed of Pbl2 in 5500 r.p.m and immersion time at 30s. According to the optimal conditions, the PCE of the mesoporous perovskite solar cells achieved 13.04%.High-efficiency perovskite solar cells typically use the TiO2 compact layer as electrons transporting layers. However, the optical and electronic properties of TiO2 still exhibit some shortfalls. In this manuscript, we report the Ru-doped TiO2 compact layer by the spray pyrolysis methods and its application in simple planar heterojunction solar cell incorporating the mixed halide perovskite CH3NH3Pbl3-xClx as the absorbing layer. The devices with the Ru-doped TiO2 compact layer could reach power conversion efficiency (PCE) of 15.70%. The properties were characterized by the SEM?XRD. The article analyzes the inner mechanism of performance enhancement of planar heterojunction perovskite solar cells by Ru doping of TiO2 compact layer. On the other hand, Introduced in this paper is a preliminary research on the new compact layer. We successfully prepared zinc tin oxide. The power conversion efficiency of planar heterojunction perovskite solar cells achieved 9.58%. We proved that the oxide can be applied to the perovskite solar.The high efficiency obtained with these perovskite solar cells demonstrates their potential for implementation as commercial solar cells. However, the use of organic hole conductors may represent a potential hurdle to the future commercialization of this type of solar cell because of their relatively high cost. In this study, we present perovskite solar cell utilizing Cul as the hole conductor demonstrating an inexpensive, stable hole conductor. The Cul film was deposited by electrochemical method. The power conversion efficiency of trans-planar heterojunction perovskite solar cells achieved 2.70%. |
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