2, Portland State University, Portland, Oregon, United States
The purpose of this project is to design and fabricate a lead-free perovskite solar cell. The solar cell has to be non-toxic as well as being stable in a natural open air environments with a specific resistance to moisture. This design incorporates the use of organic and inorganic materials, as well as the efficient use of the perovskite crystalline structure that is produced by using the properties of Bismuth (III). The advantages of using perovskite for the active layer include but are not limited to broad a light absorption spectrum, tunable band gaps, long charge carrier diffusion, and low fabrication cost. Perovskite solar cells are especially promising when considering the technology lifespan. The procedure done for this solar cell design allowed for investigation using different sets of equipment like hot plate and a sputter coater. The titania was also experimented with by incorporating transparent and reflective pastes. With this different build of this cell the metal contact layer was palladium deposited by sputter coating. This process didn’t produce uniform layers at this level in the research. Further time will allow for more uniformity and consistent values for the layers produced. The TiO2 blocking layer has a difference in thickness of .03 µm, as well as the TiO2 mesoporous layer with a thickness variance range of .03 µm. The result was a tested photoreactive cell. This research shows great promise along with lots of room for improvement. The future and current scope of the project will be on improvement of manufacturing conditions and techniques to further the quality of layer properties of perovskite.