Synthesis Of Organic-inorganic Hybrid Perovskite For Photovoltaic And Photodector

As energy issues become increasingly prominent, the development and utilization of solar energy has attracted increasing attention. In recent years, it is setting off a boom in the field of photovoltaic research. Perovskite as a direct semiconductor material, not only can be used as the light-absorbing layer, but also have the ability to transport electrons and holes in a solar cell. It attracts wide attention based on the physical and chemical properties of perovskite materials. In this article, we prepared organic-inorganic hybrid perovskite(CH3NH3PbI3), optimized material synthesis conditions and explored the impact of device structure on performance. The main research results include:1. We have prepared CH3NH3PbI3 perovskite single crystal material and fabricated the perovskite-based solar cells. Meanwhile, we also characterized the CH3NH3PbI3 structure via the techniques of UV-Vis, XRD, and SEM and so on. The study shows that this material has had a wide spectrum of absorption about 400 nm-790 nm, which with a tetragonal single crystal nanowires or nanoplates. Moreover, it is also exhibited the power conversion efficiency over 10% when apply it to solar cell functional device.2. We have investigated the effects of reaction time and reaction temperature for the formation of perovskite. By comparing the growth status of perovskite under the condition of sequential and discontinuous with different reaction time, along with the different reaction temperature, we have optimized the device fabrication processes and obtained thin films with controllable morphology, which gave high efficiency perovskite-based solar cell.3. We have developed a new hole transport material(HTM) based-on WS2-P3 HT nanocomposite. WS2 were dispersed by poly(3-hexylthiophene)(P3HT) in chloroform solution to give WS2-P3 HT organic-inorganic nanocomposite. By employing this nanocomposite to modify the HTM layer in perovskites-based solar cell, we obtained enhanced photoelectric conversion efficiency.4. We have prepared the TiO2 based perovskites photedetector, and studied the effects of the TiO2 morphology on the photodetector performance. We have synthesized titanium dioxide films with different morphology, including compacted(c-TiO2)、mesoporous(m-TiO2) and mixed(c-TiO2/m-TiO2) titanium dioxide. On top of these materials, we fabricated CH3NH3PbI3 thin film by sequential deposition method at room temperature. Property studies on the photodetectors based on different perovskite/TiO2 materials revealed that the mesopouros TiO2 is more advantageous to perovskite photodetector performance improvement.