Study On The Perovskite Solar Cell Fabricated Using Low-temperature Solution

Energy sources is a driving force to the development and progress of the world, is the foundation of human being. In recent years, because of the increasingly serious energy crisis and the day-to-day worsening of the global ecological environment,energy problem has been unable to avoid. The development and utilization of new energy sources are putting on the agenda. With the progress of science and technology, many new forms of energy sources have been developed and utilized such as wind energy, hydro energy, bio-energy, nuclear energy and solar energy and so on.Especially in recent years, the solid solar cells using organometal halide as light absorbers attract greatly interested. Perovskite solar cells can not only absorb the visible and near-infrared light, but also the charge carriers of generating are not easy to compound. It possesses the virtues of Simple device structures, low material costs, superb power conversion efficiency. We can learn from planar polymer solar cells, planar Perovskite solar cells come into being.We use the two-step methods to prepare the plane perovskite solar cells. To improve the performance of the device we make a study of the solar cell mainly from two aspects. We study the influence of different CH3NH3 I concentration for the device. When the concentration elected is appropriate, the crystal structure of perovskite active layer is excellent and absorbance intensities increase under the same wavelengths. This promotes the generation, separation and transport of carriers, and enhance the short circuit current density of device. PEDOT: PSS was used as a hole transport layer in our experiment. We used DMF to optimize PEDOT: PSS. We observed the electrical conductivity of PEDOT:PSS was improved. It is advantageous to transfer the hole to the anode and there are a lot of accumulation of charge in the two poles of the battery. Problems appeared in the process of preparation of devices by two-steps: Uneven perovskite absorbed layer and low device repeatability. We try to adopt the method of double-source evaporation for improving device performance. By controlling the evaporation rate and dosage of these two materials, we made a relatively flat perovskite absorbde layer, and the repeatability of the device is greatly improved.