Proceedings of Online Meetup: Contemporary Stability Challenges in Hybrid Perovskite Photovoltaics (SCHP)
Publication date: 14th April 2020
Although Perovskite Solar Cells have already achieved great values of efficiency, scalability is still a barrier to commercialization. Thermal co-evaporation is a promising deposition technique that could replace the conventional spin-coating, providing advantages such as better control of the environment, precise thickness control, being solvent-free, and compatibility with large areas. However, the control of the stoichiometry is not straight forward and a better understanding of the composition and properties of the deposited film is needed. In this work, we studied parameters such as temperature in the source of MAI, the deposition rate of PbI2, and the time of post-annealing. We found that the MAI temperature is closely related to the pressure of the chamber, and that, high pressures are required to get high absorption and peaks in the XRD pattern that correspond to perovskite. However, such high temperatures that provide better bulk properties show lower photoluminesce intensity, which could be related to the formation of defects on the surface due to an accumulation of MAI.
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